mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-11-23 19:59:16 +01:00
1234 lines
47 KiB
C
1234 lines
47 KiB
C
/********************************************************************************************
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PNGU Version : 0.2a
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Coder : frontier
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More info : http://frontier-dev.net
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********************************************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <png.h>
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#include "pngu.h"
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#include "gecko/gecko.hpp"
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#include "loader/utils.h"
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#include "memory/mem2.hpp"
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// Constants
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#define PNGU_SOURCE_BUFFER 1
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#define PNGU_SOURCE_DEVICE 2
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// Prototypes of helper functions
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int pngu_info (IMGCTX ctx);
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int pngu_decode (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, PNGU_u32 stripAlpha, int force32bits);
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void pngu_free_info (IMGCTX ctx);
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void pngu_read_data_from_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
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void pngu_write_data_to_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
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int pngu_clamp (int value, int min, int max);
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// PNGU Image context struct
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struct _IMGCTX
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{
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int source;
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void *buffer;
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char *filename;
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PNGU_u32 cursor;
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PNGU_u32 buf_size; // buffer size
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PNGU_u32 propRead;
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PNGUPROP prop;
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PNGU_u32 infoRead;
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png_structp png_ptr;
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png_infop info_ptr;
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FILE *fd;
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png_bytep *row_pointers;
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png_bytep img_data;
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};
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// PNGU Implementation //
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IMGCTX PNGU_SelectImageFromBuffer (const void *buffer)
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{
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if (!buffer) return NULL;
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IMGCTX ctx = malloc(sizeof (struct _IMGCTX));
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if (!ctx) return NULL;
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ctx->buffer = (void *) buffer;
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ctx->source = PNGU_SOURCE_BUFFER;
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ctx->cursor = 0;
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ctx->filename = NULL;
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ctx->propRead = 0;
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ctx->infoRead = 0;
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ctx->buf_size = 0;
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return ctx;
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}
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IMGCTX PNGU_SelectImageFromDevice (const char *filename)
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{
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if (!filename)
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return NULL;
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IMGCTX ctx = malloc(sizeof (struct _IMGCTX));
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if (ctx == NULL)
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return NULL;
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ctx->buffer = NULL;
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ctx->source = PNGU_SOURCE_DEVICE;
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ctx->cursor = 0;
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ctx->filename = malloc(strlen (filename) + 1);
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if (ctx->filename == NULL)
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{
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if(ctx != NULL)
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free(ctx);
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return NULL;
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}
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strcpy(ctx->filename, filename);
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ctx->propRead = 0;
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ctx->infoRead = 0;
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return ctx;
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}
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void PNGU_ReleaseImageContext (IMGCTX ctx)
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{
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if(!ctx)
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return;
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if(ctx->filename)
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free(ctx->filename);
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if((ctx->propRead) && (ctx->prop.trans))
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free(ctx->prop.trans);
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pngu_free_info(ctx);
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free(ctx);
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}
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int PNGU_GetImageProperties (IMGCTX ctx, PNGUPROP *imgprop)
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{
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if (!ctx->propRead)
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{
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int res = pngu_info (ctx);
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if (res != PNGU_OK)
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return res;
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}
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*imgprop = ctx->prop;
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return PNGU_OK;
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}
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int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
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{
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// width needs to be divisible by two
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if (width % 2) return PNGU_ODD_WIDTH;
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// stride needs to be divisible by two
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if (stride % 2) return PNGU_ODD_STRIDE;
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int result = pngu_decode (ctx, width, height, 1, 0);
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if (result != PNGU_OK)
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return result;
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PNGU_u32 x, y, buffWidth = (width + stride) / 2;
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// Copy image to the output buffer
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for (y = 0; y < height; y++)
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for (x = 0; x < (width / 2); x++)
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((PNGU_u32 *)buffer)[y*buffWidth+x] = PNGU_RGB8_TO_YCbYCr (*(ctx->row_pointers[y]+x*6), *(ctx->row_pointers[y]+x*6+1), *(ctx->row_pointers[y]+x*6+2),
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*(ctx->row_pointers[y]+x*6+3), *(ctx->row_pointers[y]+x*6+4), *(ctx->row_pointers[y]+x*6+5));
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// Free resources
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free(ctx->img_data);
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free(ctx->row_pointers);
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// Success
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return PNGU_OK;
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}
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int PNGU_DecodeToRGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
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{
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int result = pngu_decode (ctx, width, height, 1, 0);
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if (result != PNGU_OK) return result;
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PNGU_u32 x, y, buffWidth = width + stride;
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// Copy image to the output buffer
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for (y = 0; y < height; y++)
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for (x = 0; x < width; x++)
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((PNGU_u16 *)buffer)[y*buffWidth+x] =
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(((PNGU_u16) (ctx->row_pointers[y][x*3] & 0xF8)) << 8) |
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(((PNGU_u16) (ctx->row_pointers[y][x*3+1] & 0xFC)) << 3) |
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(((PNGU_u16) (ctx->row_pointers[y][x*3+2] & 0xF8)) >> 3);
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// Free resources
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free(ctx->img_data);
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free(ctx->row_pointers);
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// Success
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return PNGU_OK;
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}
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int PNGU_DecodeToRGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride, PNGU_u8 default_alpha)
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{
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int result = pngu_decode (ctx, width, height, 0, 0);
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if (result != PNGU_OK)
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return result;
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PNGU_u32 x, y, buffWidth = width + stride;
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// Check is source image has an alpha channel
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if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
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{
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// Alpha channel present, copy image to the output buffer
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for (y = 0; y < height; y++)
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memcpy (buffer + (y * buffWidth * 4), ctx->row_pointers[y], width * 4);
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}
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else
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{
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// No alpha channel present, copy image to the output buffer
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for (y = 0; y < height; y++)
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for (x = 0; x < width; x++)
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((PNGU_u32 *)buffer)[y*buffWidth+x] =
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(((PNGU_u32) ctx->row_pointers[y][x*3]) << 24) |
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(((PNGU_u32) ctx->row_pointers[y][x*3+1]) << 16) |
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(((PNGU_u32) ctx->row_pointers[y][x*3+2]) << 8) |
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((PNGU_u32) default_alpha);
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}
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// Free resources
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free(ctx->img_data);
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free(ctx->row_pointers);
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// Success
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return PNGU_OK;
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}
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int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer)
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{
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// width and height need to be divisible by four
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// if ((width % 4) || (height % 4))
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// return PNGU_INVALID_WIDTH_OR_HEIGHT;
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int result = pngu_decode (ctx, width, height, 1, 0);
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if (result != PNGU_OK) return result;
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PNGU_u32 x, y, qwidth = width / 4, qheight = height / 4;
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// Copy image to the output buffer
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for (y = 0; y < qheight; y++)
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{
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if (((y + 0xFF) & 0xFF) == 0)
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usleep(100);
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for (x = 0; x < qwidth; x++)
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{
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int blockbase = (y * qwidth + x) * 4;
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PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
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PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
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((PNGU_u64 *) buffer)[blockbase] =
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(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
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(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
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(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
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(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
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field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
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field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
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((PNGU_u64 *) buffer)[blockbase+1] =
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(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
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(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
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(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
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(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
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field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
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field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
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((PNGU_u64 *) buffer)[blockbase+2] =
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(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
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(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
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(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
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(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
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field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
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field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
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((PNGU_u64 *) buffer)[blockbase+3] =
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(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
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(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
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(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
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(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
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}
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}
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// Free resources
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free(ctx->img_data);
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free(ctx->row_pointers);
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// Success
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return PNGU_OK;
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}
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int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha)
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{
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// width and height need to be divisible by four
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if ((width % 4) || (height % 4)) return PNGU_INVALID_WIDTH_OR_HEIGHT;
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int result = pngu_decode (ctx, width, height, 0, 0);
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if (result != PNGU_OK) return result;
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// Init some vars
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PNGU_u32 x, y, qwidth = width / 4, qheight = height / 4;
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// Check if source image has an alpha channel
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if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
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{
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// Alpha channel present, copy image to the output buffer
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for (y = 0; y < qheight; y++)
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for (x = 0; x < qwidth; x++)
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{
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int blockbase = (y * qwidth + x) * 4;
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PNGU_u64 tmp;
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PNGU_u64 fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16));
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PNGU_u64 fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16+8));
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// If first pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
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if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
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tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
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else
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tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
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// If second pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
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if ((fieldA & 0xE0ULL) == 0xE0ULL)
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tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
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else
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tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
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// If third pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
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if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
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tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
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else
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tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
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// If fourth pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
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if ((fieldB & 0xE0ULL) == 0xE0ULL)
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tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
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else
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tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
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((PNGU_u64 *) buffer)[blockbase] = tmp;
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fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16));
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fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16+8));
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if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
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// Opaque pixel, so set MSB to 1 and encode colors in RGB555
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tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
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else
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// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
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tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
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if ((fieldA & 0xE0ULL) == 0xE0ULL)
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// Opaque pixel, so set MSB to 1 and encode colors in RGB555
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tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
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else
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// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
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tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
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if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
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// Opaque pixel, so set MSB to 1 and encode colors in RGB555
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tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
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else
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// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
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tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
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if ((fieldB & 0xE0ULL) == 0xE0ULL)
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// Opaque pixel, so set MSB to 1 and encode colors in RGB555
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tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
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else
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// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
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tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
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((PNGU_u64 *) buffer)[blockbase+1] = tmp;
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fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16));
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fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16+8));
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if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
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// Opaque pixel, so set MSB to 1 and encode colors in RGB555
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tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
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else
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// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
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tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
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if ((fieldA & 0xE0ULL) == 0xE0ULL)
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// Opaque pixel, so set MSB to 1 and encode colors in RGB555
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tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
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else
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// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
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tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
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if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
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// Opaque pixel, so set MSB to 1 and encode colors in RGB555
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tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
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else
|
|
// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
|
|
tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
|
|
|
|
if ((fieldB & 0xE0ULL) == 0xE0ULL)
|
|
// Opaque pixel, so set MSB to 1 and encode colors in RGB555
|
|
tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
|
|
else
|
|
// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
|
|
tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
|
|
((PNGU_u64 *) buffer)[blockbase+2] = tmp;
|
|
|
|
fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16));
|
|
fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16+8));
|
|
if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
|
|
// Opaque pixel, so set MSB to 1 and encode colors in RGB555
|
|
tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
|
|
else
|
|
// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
|
|
tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
|
|
|
|
if ((fieldA & 0xE0ULL) == 0xE0ULL)
|
|
// Opaque pixel, so set MSB to 1 and encode colors in RGB555
|
|
tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
|
|
else
|
|
// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
|
|
tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
|
|
|
|
if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
|
|
// Opaque pixel, so set MSB to 1 and encode colors in RGB555
|
|
tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
|
|
else
|
|
// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
|
|
tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
|
|
|
|
if ((fieldB & 0xE0ULL) == 0xE0ULL)
|
|
// Opaque pixel, so set MSB to 1 and encode colors in RGB555
|
|
tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
|
|
else
|
|
// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
|
|
tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
|
|
((PNGU_u64 *) buffer)[blockbase+3] = tmp;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// No alpha channel present, copy image to the output buffer
|
|
PNGU_u64 alphaMask;
|
|
default_alpha = (default_alpha >> 5);
|
|
if (default_alpha == 7)
|
|
{
|
|
// The user wants an opaque texture, so set MSB to 1 and encode colors in RGB555
|
|
alphaMask = 0x8000800080008000ULL;
|
|
|
|
for (y = 0; y < qheight; y++)
|
|
for (x = 0; x < qwidth; x++)
|
|
{
|
|
int blockbase = (y * qwidth + x) * 4;
|
|
|
|
PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
|
|
PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase] =
|
|
alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
|
|
((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
|
|
((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) |
|
|
((field32 & 0xF8000000ULL) >> 11) | ((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+1] =
|
|
alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
|
|
((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
|
|
((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) |
|
|
((field32 & 0xF8000000ULL) >> 11) | ((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+2] =
|
|
alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
|
|
((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
|
|
((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) |
|
|
((field32 & 0xF8000000ULL) >> 11) | ((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+3] =
|
|
alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
|
|
((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
|
|
((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) |
|
|
((field32 & 0xF8000000ULL) >> 11) | ((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// The user wants a translucid texture, so set MSB to 0 and encode colors in ARGB3444
|
|
default_alpha = (default_alpha << 4);
|
|
alphaMask = (((PNGU_u64) default_alpha) << 56) | (((PNGU_u64) default_alpha) << 40) |
|
|
(((PNGU_u64) default_alpha) << 24) | (((PNGU_u64) default_alpha) << 8);
|
|
|
|
for (y = 0; y < qheight; y++)
|
|
for (x = 0; x < qwidth; x++)
|
|
{
|
|
int blockbase = (y * qwidth + x) * 4;
|
|
|
|
PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
|
|
PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase] =
|
|
alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) |
|
|
((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) |
|
|
((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |
|
|
((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+1] =
|
|
alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) |
|
|
((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) |
|
|
((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |
|
|
((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+2] =
|
|
alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) |
|
|
((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) |
|
|
((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |
|
|
((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+3] =
|
|
alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) |
|
|
((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) |
|
|
((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |
|
|
((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Free resources
|
|
free(ctx->img_data);
|
|
free(ctx->row_pointers);
|
|
|
|
// Success
|
|
return PNGU_OK;
|
|
}
|
|
|
|
|
|
int PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha)
|
|
{
|
|
// width and height need to be divisible by four
|
|
// if ((width % 4) || (height % 4))
|
|
// return PNGU_INVALID_WIDTH_OR_HEIGHT;
|
|
|
|
int result = pngu_decode (ctx, width, height, 0, 0);
|
|
if (result != PNGU_OK) return result;
|
|
|
|
// Init some variables
|
|
PNGU_u32 x, y, qwidth = width / 4, qheight = height / 4;
|
|
|
|
// Check is source image has an alpha channel
|
|
if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
|
|
{
|
|
// Alpha channel present, copy image to the output buffer
|
|
for (y = 0; y < qheight; y++)
|
|
for (x = 0; x < qwidth; x++)
|
|
{
|
|
int blockbase = (y * qwidth + x) * 8;
|
|
|
|
PNGU_u64 fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16));
|
|
PNGU_u64 fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16+8));
|
|
((PNGU_u64 *) buffer)[blockbase] =
|
|
((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) |
|
|
((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) |
|
|
((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) |
|
|
((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
|
|
((PNGU_u64 *) buffer)[blockbase+4] =
|
|
((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
|
|
((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
|
|
|
|
fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16));
|
|
fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16+8));
|
|
((PNGU_u64 *) buffer)[blockbase+1] =
|
|
((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) |
|
|
((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) |
|
|
((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) |
|
|
((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
|
|
((PNGU_u64 *) buffer)[blockbase+5] =
|
|
((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
|
|
((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
|
|
|
|
fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16));
|
|
fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16+8));
|
|
((PNGU_u64 *) buffer)[blockbase+2] =
|
|
((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) |
|
|
((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) |
|
|
((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) |
|
|
((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
|
|
((PNGU_u64 *) buffer)[blockbase+6] =
|
|
((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
|
|
((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
|
|
|
|
fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16));
|
|
fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16+8));
|
|
((PNGU_u64 *) buffer)[blockbase+3] =
|
|
((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) |
|
|
((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) |
|
|
((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) |
|
|
((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
|
|
((PNGU_u64 *) buffer)[blockbase+7] =
|
|
((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
|
|
((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// No alpha channel present, copy image to the output buffer
|
|
PNGU_u64 alphaMask = (((PNGU_u64)default_alpha) << 56) | (((PNGU_u64)default_alpha) << 40) |
|
|
(((PNGU_u64)default_alpha) << 24) | (((PNGU_u64)default_alpha) << 8);
|
|
|
|
for (y = 0; y < qheight; y++)
|
|
for (x = 0; x < qwidth; x++)
|
|
{
|
|
int blockbase = (y * qwidth + x) * 8;
|
|
|
|
PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
|
|
PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase] =
|
|
(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) |
|
|
((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
|
|
((PNGU_u64 *) buffer)[blockbase+4] =
|
|
(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
|
|
((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+1] =
|
|
(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) |
|
|
((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
|
|
((PNGU_u64 *) buffer)[blockbase+5] =
|
|
(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
|
|
((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+2] =
|
|
(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) |
|
|
((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
|
|
((PNGU_u64 *) buffer)[blockbase+6] =
|
|
(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
|
|
((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
|
|
|
|
field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
|
|
field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
|
|
((PNGU_u64 *) buffer)[blockbase+3] =
|
|
(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) |
|
|
((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
|
|
((PNGU_u64 *) buffer)[blockbase+7] =
|
|
(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
|
|
((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
|
|
}
|
|
}
|
|
|
|
// Free resources
|
|
free(ctx->img_data);
|
|
free(ctx->row_pointers);
|
|
|
|
// Success
|
|
return PNGU_OK;
|
|
}
|
|
|
|
|
|
static inline PNGU_u16 rgb8ToRGB565(PNGU_u8 *color)
|
|
{
|
|
return ((color[0] >> 3) << 11) | ((color[1] >> 2) << 5) | (color[2] >> 3);
|
|
}
|
|
|
|
|
|
static int colorDistance(const PNGU_u8 *c0, const PNGU_u8 *c1)
|
|
{
|
|
return (c1[0] - c0[0]) * (c1[0] - c0[0]) + (c1[1] - c0[1]) * (c1[1] - c0[1]) + (c1[2] - c0[2]) * (c1[2] - c0[2]);
|
|
}
|
|
|
|
|
|
static void getBaseColors(PNGU_u8 *color0, PNGU_u8 *color1, const PNGU_u8 *srcBlock)
|
|
{
|
|
int i, j, maxDistance = -1;
|
|
|
|
for (i = 0; i < 15; ++i)
|
|
for (j = i + 1; j < 16; ++j)
|
|
{
|
|
int distance = colorDistance(srcBlock + i * 4, srcBlock + j * 4);
|
|
if (distance > maxDistance)
|
|
{
|
|
maxDistance = distance;
|
|
*(PNGU_u32 *)color0 = ((PNGU_u32 *)srcBlock)[i];
|
|
*(PNGU_u32 *)color1 = ((PNGU_u32 *)srcBlock)[j];
|
|
}
|
|
}
|
|
if (rgb8ToRGB565(color0) < rgb8ToRGB565(color1))
|
|
{
|
|
PNGU_u32 tmp = *(PNGU_u32 *)color0;
|
|
*(PNGU_u32 *)color0 = *(PNGU_u32 *)color1;
|
|
*(PNGU_u32 *)color1 = tmp;
|
|
}
|
|
}
|
|
|
|
|
|
static PNGU_u32 colorIndices(const PNGU_u8 *color0, const PNGU_u8 *color1, const PNGU_u8 *srcBlock)
|
|
{
|
|
PNGU_u16 colors[4][4];
|
|
PNGU_u32 res = 0;
|
|
int i;
|
|
|
|
// Make the 4 colors available in the block
|
|
colors[0][0] = (color0[0] & 0xF8) | (color0[0] >> 5);
|
|
colors[0][1] = (color0[1] & 0xFC) | (color0[1] >> 6);
|
|
colors[0][2] = (color0[2] & 0xF8) | (color0[2] >> 5);
|
|
colors[1][0] = (color1[0] & 0xF8) | (color1[0] >> 5);
|
|
colors[1][1] = (color1[1] & 0xFC) | (color1[1] >> 6);
|
|
colors[1][2] = (color1[2] & 0xF8) | (color1[2] >> 5);
|
|
colors[2][0] = (2 * colors[0][0] + 1 * colors[1][0]) / 3;
|
|
colors[2][1] = (2 * colors[0][1] + 1 * colors[1][1]) / 3;
|
|
colors[2][2] = (2 * colors[0][2] + 1 * colors[1][2]) / 3;
|
|
colors[3][0] = (1 * colors[0][0] + 2 * colors[1][0]) / 3;
|
|
colors[3][1] = (1 * colors[0][1] + 2 * colors[1][1]) / 3;
|
|
colors[3][2] = (1 * colors[0][2] + 2 * colors[1][2]) / 3;
|
|
for (i = 15; i >= 0; --i)
|
|
{
|
|
int c0 = srcBlock[i * 4 + 0];
|
|
int c1 = srcBlock[i * 4 + 1];
|
|
int c2 = srcBlock[i * 4 + 2];
|
|
int d0 = abs(colors[0][0] - c0) + abs(colors[0][1] - c1) + abs(colors[0][2] - c2);
|
|
int d1 = abs(colors[1][0] - c0) + abs(colors[1][1] - c1) + abs(colors[1][2] - c2);
|
|
int d2 = abs(colors[2][0] - c0) + abs(colors[2][1] - c1) + abs(colors[2][2] - c2);
|
|
int d3 = abs(colors[3][0] - c0) + abs(colors[3][1] - c1) + abs(colors[3][2] - c2);
|
|
int b0 = d0 > d3;
|
|
int b1 = d1 > d2;
|
|
int b2 = d0 > d2;
|
|
int b3 = d1 > d3;
|
|
int b4 = d2 > d3;
|
|
int x0 = b1 & b2;
|
|
int x1 = b0 & b3;
|
|
int x2 = b0 & b4;
|
|
res |= (x2 | ((x0 | x1) << 1)) << ((15 - i) << 1);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
int PNGU_DecodeToCMPR(IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer)
|
|
{
|
|
PNGU_u8 srcBlock[16 * 4];
|
|
PNGU_u8 color0[4];
|
|
PNGU_u8 color1[4];
|
|
PNGU_u8 *outBuf = (PNGU_u8 *)buffer;
|
|
int ii, jj, k;
|
|
|
|
int result = pngu_decode (ctx, width, height, 0, 1);
|
|
if (result != PNGU_OK) return result;
|
|
width = width & ~7u;
|
|
height = height & ~7u;
|
|
// Alpha channel present, copy image to the output buffer
|
|
for (jj = 0; jj < (int)height; jj += 8)
|
|
for (ii = 0; ii < (int)width; ii += 8)
|
|
for (k = 0; k < 4; ++k)
|
|
{
|
|
int j = jj + ((k >> 1) << 2);
|
|
int i = ii + ((k & 1) << 2);
|
|
memcpy(srcBlock, ctx->row_pointers[j] + i * 4, 16);
|
|
memcpy(srcBlock + 4 * 4, ctx->row_pointers[j + 1] + i * 4, 16);
|
|
memcpy(srcBlock + 8 * 4, ctx->row_pointers[j + 2] + i * 4, 16);
|
|
memcpy(srcBlock + 12 * 4, ctx->row_pointers[j + 3] + i * 4, 16);
|
|
getBaseColors(color0, color1, srcBlock);
|
|
*(PNGU_u16 *)outBuf = rgb8ToRGB565(color0);
|
|
outBuf += 2;
|
|
*(PNGU_u16 *)outBuf = rgb8ToRGB565(color1);
|
|
outBuf += 2;
|
|
*(PNGU_u32 *)outBuf = colorIndices(color0, color1, srcBlock);
|
|
outBuf += 4;
|
|
}
|
|
// Free resources
|
|
free(ctx->img_data);
|
|
free(ctx->row_pointers);
|
|
|
|
// Success
|
|
return PNGU_OK;
|
|
}
|
|
|
|
int PNGU_EncodeFromYCbYCr(IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
|
|
{
|
|
// Erase from the context any readed info
|
|
pngu_free_info (ctx);
|
|
ctx->propRead = 0;
|
|
|
|
// Check if the user has selected a file to write the image
|
|
if (ctx->source == PNGU_SOURCE_BUFFER);
|
|
|
|
else if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
{
|
|
// Open file
|
|
if (!(ctx->fd = fopen (ctx->filename, "wb")))
|
|
return PNGU_CANT_OPEN_FILE;
|
|
}
|
|
|
|
else
|
|
return PNGU_NO_FILE_SELECTED;
|
|
|
|
// Allocation of libpng structs
|
|
ctx->png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
|
if (!(ctx->png_ptr))
|
|
{
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
ctx->info_ptr = png_create_info_struct (ctx->png_ptr);
|
|
if (!(ctx->info_ptr))
|
|
{
|
|
png_destroy_write_struct (&(ctx->png_ptr), (png_infopp)NULL);
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
if (ctx->source == PNGU_SOURCE_BUFFER)
|
|
{
|
|
// Installation of our custom data writer function
|
|
ctx->cursor = 0;
|
|
png_set_write_fn (ctx->png_ptr, ctx, pngu_write_data_to_buffer, NULL);
|
|
}
|
|
else if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
{
|
|
// Default data writer uses function fwrite, so it needs to use our FILE*
|
|
png_init_io (ctx->png_ptr, ctx->fd);
|
|
}
|
|
|
|
// Setup output file properties
|
|
png_set_IHDR (ctx->png_ptr, ctx->info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB,
|
|
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
|
|
|
|
// Allocate memory to store the image in RGB format
|
|
png_uint_32 rowbytes = width * 3;
|
|
if (rowbytes % 4)
|
|
rowbytes = ((rowbytes / 4) + 1) * 4; // Add extra padding so each row starts in a 4 byte boundary
|
|
|
|
ctx->img_data = malloc(rowbytes * height);
|
|
if (!ctx->img_data)
|
|
{
|
|
png_destroy_write_struct (&(ctx->png_ptr), (png_infopp)NULL);
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
ctx->row_pointers = malloc(sizeof (png_bytep) * height);
|
|
if (!ctx->row_pointers)
|
|
{
|
|
png_destroy_write_struct (&(ctx->png_ptr), (png_infopp)NULL);
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
// Encode YCbYCr image into RGB8 format
|
|
PNGU_u32 x, y, buffWidth = (width + stride) / 2;
|
|
for (y = 0; y < height; y++)
|
|
{
|
|
ctx->row_pointers[y] = ctx->img_data + (y * rowbytes);
|
|
|
|
for (x = 0; x < (width / 2); x++)
|
|
PNGU_YCbYCr_TO_RGB8 ( ((PNGU_u32 *)buffer)[y*buffWidth+x],
|
|
((PNGU_u8 *) ctx->row_pointers[y]+x*6), ((PNGU_u8 *) ctx->row_pointers[y]+x*6+1),
|
|
((PNGU_u8 *) ctx->row_pointers[y]+x*6+2), ((PNGU_u8 *) ctx->row_pointers[y]+x*6+3),
|
|
((PNGU_u8 *) ctx->row_pointers[y]+x*6+4), ((PNGU_u8 *) ctx->row_pointers[y]+x*6+5) );
|
|
}
|
|
|
|
// Tell libpng where is our image data
|
|
png_set_rows (ctx->png_ptr, ctx->info_ptr, ctx->row_pointers);
|
|
|
|
// Write file header and image data
|
|
png_write_png (ctx->png_ptr, ctx->info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
|
|
|
|
// Tell libpng we have no more data to write
|
|
png_write_end (ctx->png_ptr, (png_infop) NULL);
|
|
|
|
// Free resources
|
|
free(ctx->img_data);
|
|
free(ctx->row_pointers);
|
|
png_destroy_write_struct (&(ctx->png_ptr), &(ctx->info_ptr));
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
|
|
// Success
|
|
return PNGU_OK;
|
|
}
|
|
|
|
|
|
// This function is taken from a libogc example
|
|
PNGU_u32 PNGU_RGB8_TO_YCbYCr (PNGU_u8 r1, PNGU_u8 g1, PNGU_u8 b1, PNGU_u8 r2, PNGU_u8 g2, PNGU_u8 b2)
|
|
{
|
|
int y1 = (299 * r1 + 587 * g1 + 114 * b1) / 1000;
|
|
int cb1 = (-16874 * r1 - 33126 * g1 + 50000 * b1 + 12800000) / 100000;
|
|
int cr1 = (50000 * r1 - 41869 * g1 - 8131 * b1 + 12800000) / 100000;
|
|
|
|
int y2 = (299 * r2 + 587 * g2 + 114 * b2) / 1000;
|
|
int cb2 = (-16874 * r2 - 33126 * g2 + 50000 * b2 + 12800000) / 100000;
|
|
int cr2 = (50000 * r2 - 41869 * g2 - 8131 * b2 + 12800000) / 100000;
|
|
|
|
int cb = (cb1 + cb2) >> 1;
|
|
int cr = (cr1 + cr2) >> 1;
|
|
|
|
return (PNGU_u32) ((y1 << 24) | (cb << 16) | (y2 << 8) | cr);
|
|
}
|
|
|
|
|
|
void PNGU_YCbYCr_TO_RGB8 (PNGU_u32 ycbycr, PNGU_u8 *r1, PNGU_u8 *g1, PNGU_u8 *b1, PNGU_u8 *r2, PNGU_u8 *g2, PNGU_u8 *b2)
|
|
{
|
|
PNGU_u8 *val = (PNGU_u8 *) &ycbycr;
|
|
|
|
int r = 1.371f * (val[3] - 128);
|
|
int g = - 0.698f * (val[3] - 128) - 0.336f * (val[1] - 128);
|
|
int b = 1.732f * (val[1] - 128);
|
|
|
|
*r1 = pngu_clamp (val[0] + r, 0, 255);
|
|
*g1 = pngu_clamp (val[0] + g, 0, 255);
|
|
*b1 = pngu_clamp (val[0] + b, 0, 255);
|
|
|
|
*r2 = pngu_clamp (val[2] + r, 0, 255);
|
|
*g2 = pngu_clamp (val[2] + g, 0, 255);
|
|
*b2 = pngu_clamp (val[2] + b, 0, 255);
|
|
}
|
|
|
|
|
|
int pngu_info (IMGCTX ctx)
|
|
{
|
|
png_byte magic[8];
|
|
|
|
// Check if there is a file selected and if it is a valid .png
|
|
if (ctx->source == PNGU_SOURCE_BUFFER)
|
|
memcpy (magic, ctx->buffer, 8);
|
|
|
|
else if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
{
|
|
// Open file
|
|
if (!(ctx->fd = fopen (ctx->filename, "rb")))
|
|
return PNGU_CANT_OPEN_FILE;
|
|
|
|
// Load first 8 bytes into magic buffer
|
|
if (fread (magic, 1, 8, ctx->fd) != 8)
|
|
{
|
|
fclose (ctx->fd);
|
|
return PNGU_CANT_READ_FILE;
|
|
}
|
|
}
|
|
|
|
else
|
|
return PNGU_NO_FILE_SELECTED;;
|
|
|
|
if (png_sig_cmp(magic, 0, 8) != 0)
|
|
{
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
return PNGU_FILE_IS_NOT_PNG;
|
|
}
|
|
|
|
// Allocation of libpng structs
|
|
ctx->png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
|
|
if (!(ctx->png_ptr))
|
|
{
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
ctx->info_ptr = png_create_info_struct (ctx->png_ptr);
|
|
if (!(ctx->info_ptr))
|
|
{
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
png_destroy_read_struct (&(ctx->png_ptr), (png_infopp)NULL, (png_infopp)NULL);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
if (ctx->source == PNGU_SOURCE_BUFFER)
|
|
{
|
|
// Installation of our custom data provider function
|
|
ctx->cursor = 0;
|
|
png_set_read_fn (ctx->png_ptr, ctx, pngu_read_data_from_buffer);
|
|
}
|
|
else if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
{
|
|
// Default data provider uses function fread, so it needs to use our FILE*
|
|
png_init_io (ctx->png_ptr, ctx->fd);
|
|
png_set_sig_bytes (ctx->png_ptr, 8); // We have read 8 bytes already to check PNG authenticity
|
|
}
|
|
|
|
// Read png header
|
|
png_read_info (ctx->png_ptr, ctx->info_ptr);
|
|
|
|
// Query image properties if they have not been queried before
|
|
if (!ctx->propRead)
|
|
{
|
|
png_uint_32 width, height;
|
|
png_get_IHDR(ctx->png_ptr, ctx->info_ptr, &width, &height,
|
|
(int *) &(ctx->prop.imgBitDepth),
|
|
(int *) &(ctx->prop.imgColorType),
|
|
NULL, NULL, NULL);
|
|
|
|
ctx->prop.imgWidth = width;
|
|
ctx->prop.imgHeight = height;
|
|
switch (ctx->prop.imgColorType)
|
|
{
|
|
case PNG_COLOR_TYPE_GRAY:
|
|
ctx->prop.imgColorType = PNGU_COLOR_TYPE_GRAY;
|
|
break;
|
|
case PNG_COLOR_TYPE_GRAY_ALPHA:
|
|
ctx->prop.imgColorType = PNGU_COLOR_TYPE_GRAY_ALPHA;
|
|
break;
|
|
case PNG_COLOR_TYPE_PALETTE:
|
|
ctx->prop.imgColorType = PNGU_COLOR_TYPE_PALETTE;
|
|
break;
|
|
case PNG_COLOR_TYPE_RGB:
|
|
ctx->prop.imgColorType = PNGU_COLOR_TYPE_RGB;
|
|
break;
|
|
case PNG_COLOR_TYPE_RGB_ALPHA:
|
|
ctx->prop.imgColorType = PNGU_COLOR_TYPE_RGB_ALPHA;
|
|
break;
|
|
default:
|
|
ctx->prop.imgColorType = PNGU_COLOR_TYPE_UNKNOWN;
|
|
break;
|
|
}
|
|
|
|
// Constant used to scale 16 bit values to 8 bit values
|
|
int scale = 1;
|
|
if (ctx->prop.imgBitDepth == 16)
|
|
scale = 256;
|
|
|
|
// Query background color, if any.
|
|
png_color_16p background;
|
|
ctx->prop.validBckgrnd = 0;
|
|
if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA)) &&
|
|
(png_get_bKGD (ctx->png_ptr, ctx->info_ptr, &background)))
|
|
{
|
|
ctx->prop.validBckgrnd = 1;
|
|
ctx->prop.bckgrnd.r = background->red / scale;
|
|
ctx->prop.bckgrnd.g = background->green / scale;
|
|
ctx->prop.bckgrnd.b = background->blue / scale;
|
|
}
|
|
else if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA)) &&
|
|
(png_get_bKGD (ctx->png_ptr, ctx->info_ptr, &background)))
|
|
{
|
|
ctx->prop.validBckgrnd = 1;
|
|
ctx->prop.bckgrnd.r = ctx->prop.bckgrnd.g = ctx->prop.bckgrnd.b = background->gray / scale;
|
|
}
|
|
|
|
// Query list of transparent colors, if any.
|
|
u32 i;
|
|
png_bytep trans;
|
|
png_color_16p trans_values;
|
|
ctx->prop.numTrans = 0;
|
|
ctx->prop.trans = NULL;
|
|
if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA)) &&
|
|
(png_get_tRNS (ctx->png_ptr, ctx->info_ptr, &trans, (int *) &(ctx->prop.numTrans), &trans_values)))
|
|
{
|
|
if (ctx->prop.numTrans)
|
|
{
|
|
ctx->prop.trans = malloc(sizeof (PNGUCOLOR) * ctx->prop.numTrans);
|
|
if (ctx->prop.trans)
|
|
{
|
|
for (i = 0; i < ctx->prop.numTrans; i++)
|
|
{
|
|
ctx->prop.trans[i].r = trans_values[i].red / scale;
|
|
ctx->prop.trans[i].g = trans_values[i].green / scale;
|
|
ctx->prop.trans[i].b = trans_values[i].blue / scale;
|
|
}
|
|
}
|
|
else
|
|
ctx->prop.numTrans = 0;
|
|
}
|
|
}
|
|
else if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA)) &&
|
|
(png_get_tRNS (ctx->png_ptr, ctx->info_ptr, &trans, (int *) &(ctx->prop.numTrans), &trans_values)))
|
|
{
|
|
if (ctx->prop.numTrans)
|
|
{
|
|
ctx->prop.trans = malloc(sizeof (PNGUCOLOR) * ctx->prop.numTrans);
|
|
if (ctx->prop.trans)
|
|
for (i = 0; i < ctx->prop.numTrans; i++)
|
|
ctx->prop.trans[i].r = ctx->prop.trans[i].g = ctx->prop.trans[i].b =
|
|
trans_values[i].gray / scale;
|
|
else
|
|
ctx->prop.numTrans = 0;
|
|
}
|
|
}
|
|
|
|
ctx->propRead = 1;
|
|
}
|
|
|
|
// Success
|
|
ctx->infoRead = 1;
|
|
|
|
return PNGU_OK;
|
|
}
|
|
|
|
|
|
int pngu_decode (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, PNGU_u32 stripAlpha, int force32bit)
|
|
{
|
|
u32 i;
|
|
|
|
// Read info if it hasn't been read before
|
|
if (!ctx->infoRead)
|
|
{
|
|
i = pngu_info (ctx);
|
|
if (i != PNGU_OK) return i;
|
|
}
|
|
|
|
// Check if the user has specified the real width and height of the image
|
|
if ( (ctx->prop.imgWidth != width) || (ctx->prop.imgHeight != height) )
|
|
return PNGU_INVALID_WIDTH_OR_HEIGHT;
|
|
|
|
// Support paletted images
|
|
if (ctx->prop.imgColorType == PNGU_COLOR_TYPE_PALETTE)
|
|
png_set_palette_to_rgb(ctx->png_ptr);
|
|
|
|
// Check if color type is supported by PNGU
|
|
if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_UNKNOWN) )
|
|
return PNGU_UNSUPPORTED_COLOR_TYPE;
|
|
|
|
// Scale 16 bit samples to 8 bit
|
|
if (ctx->prop.imgBitDepth == 16)
|
|
png_set_strip_16 (ctx->png_ptr);
|
|
|
|
// Remove alpha channel if we don't need it
|
|
if (stripAlpha && ((ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA)))
|
|
png_set_strip_alpha (ctx->png_ptr);
|
|
|
|
// Expand 1, 2 and 4 bit samples to 8 bit
|
|
if (ctx->prop.imgBitDepth < 8)
|
|
png_set_packing (ctx->png_ptr);
|
|
|
|
// Transform grayscale images to RGB
|
|
if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) )
|
|
png_set_gray_to_rgb (ctx->png_ptr);
|
|
|
|
// Transform RBG images to RGBA
|
|
if (force32bit && (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY || ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB))
|
|
png_set_filler(ctx->png_ptr, 0xFF, PNG_FILLER_AFTER);
|
|
|
|
// Flush transformations
|
|
png_read_update_info (ctx->png_ptr, ctx->info_ptr);
|
|
|
|
// Allocate memory to store the image
|
|
png_uint_32 rowbytes = png_get_rowbytes (ctx->png_ptr, ctx->info_ptr);
|
|
if (rowbytes % 4)
|
|
rowbytes = ((rowbytes / 4) + 1) * 4; // Add extra padding so each row starts in a 4 byte boundary
|
|
|
|
ctx->img_data = malloc(rowbytes * ctx->prop.imgHeight);
|
|
if (!ctx->img_data)
|
|
{
|
|
pngu_free_info (ctx);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
ctx->row_pointers = malloc(sizeof (png_bytep) * ctx->prop.imgHeight);
|
|
if (!ctx->row_pointers)
|
|
{
|
|
free (ctx->img_data);
|
|
pngu_free_info (ctx);
|
|
return PNGU_LIB_ERROR;
|
|
}
|
|
|
|
for (i = 0; i < ctx->prop.imgHeight; i++)
|
|
ctx->row_pointers[i] = ctx->img_data + (i * rowbytes);
|
|
|
|
// Transform the image and copy it to our allocated memory
|
|
if (png_get_interlace_type(ctx->png_ptr, ctx->info_ptr) != PNG_INTERLACE_NONE)
|
|
png_read_image (ctx->png_ptr, ctx->row_pointers);
|
|
else
|
|
{
|
|
int rowsLeft = ctx->prop.imgHeight;
|
|
png_bytep *curRow = ctx->row_pointers;
|
|
while (rowsLeft > 0)
|
|
{
|
|
int chunk = rowsLeft > 0x80 ? 0x80 : rowsLeft;
|
|
png_read_rows(ctx->png_ptr, curRow, NULL, chunk);
|
|
usleep(1000);
|
|
curRow += chunk;
|
|
rowsLeft -= chunk;
|
|
}
|
|
}
|
|
|
|
// Free resources
|
|
pngu_free_info(ctx);
|
|
|
|
// Success
|
|
return PNGU_OK;
|
|
}
|
|
|
|
|
|
void pngu_free_info (IMGCTX ctx)
|
|
{
|
|
if (ctx->infoRead)
|
|
{
|
|
if (ctx->source == PNGU_SOURCE_DEVICE)
|
|
fclose (ctx->fd);
|
|
|
|
png_destroy_read_struct (&(ctx->png_ptr), &(ctx->info_ptr), (png_infopp)NULL);
|
|
|
|
ctx->infoRead = 0;
|
|
}
|
|
}
|
|
|
|
|
|
void pngu_read_data_from_buffer (png_structp png_ptr, png_bytep data, png_size_t length)
|
|
{
|
|
IMGCTX ctx = (IMGCTX) png_get_io_ptr (png_ptr);
|
|
if (ctx->buf_size && (ctx->cursor + length > ctx->buf_size))
|
|
{
|
|
static char err_str[40];
|
|
snprintf(err_str, sizeof(err_str), "read error (%x/%x)",
|
|
ctx->cursor + length, ctx->buf_size);
|
|
png_error(png_ptr, err_str);
|
|
}
|
|
memcpy (data, ctx->buffer + ctx->cursor, length);
|
|
ctx->cursor += length;
|
|
}
|
|
|
|
|
|
void pngu_write_data_to_buffer (png_structp png_ptr, png_bytep data, png_size_t length)
|
|
{
|
|
IMGCTX ctx = (IMGCTX) png_get_io_ptr (png_ptr);
|
|
memcpy (ctx->buffer + ctx->cursor, data, length);
|
|
ctx->cursor += length;
|
|
}
|
|
|
|
// Function used in YCbYCr to RGB decoding
|
|
int pngu_clamp (int value, int min, int max)
|
|
{
|
|
if (value < min) value = min;
|
|
else if (value > max) value = max;
|
|
|
|
return value;
|
|
}
|
|
|