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61fd18e438
usbloadergx/source/pngu.c
dimok321 7e0e4cab5c *Added back the trNOOP (which excluded a lot of settings languages) which i removed by mistake when adding themes 
*Added option for file splitting on install. 2GB, 4GB and on ntfs/ext2/3/4 partitions no splitting at all option.
*Fixed the install dir naming patterns option for fat32/ntfs/ext2/3/4 game installs
*Changed/Fixed Home Menu exit to loader / shutdown
*Added reload of game list on SD button click
*Fixed language file loading on startup
*Changed browse for theme path to file browser instead of OnScreenKeyboard

Several settings were changed in this revision. It is recommended to reset the configs before using this rev.


Forwarder Channel Update:
*Use of IOS58 and AHBPROT
*Complete change of forwarder. Using same as on WiiXplorer now.
*Looking for dol in every primary fat/ntfs partition in the known paths (/apps/usbloader_gx/ and /apps/usbloadergx/). (Booting loader from ntfs will be usefull once images and settings can also be stored on ntfs.)

Here is a download link for the channel:
http://www.mediafire.com/?r11bwt1occlanmk

The channel will be uploaded to the download section later when it is thoroughly tested.
2010-12-29 15:42:26 +00:00

1307 lines
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/********************************************************************************************
PNGU Version : 0.2a
Coder : frontier
More info : http://frontier-dev.net
********************************************************************************************/
#include <stdio.h>
#include <malloc.h>
#include "pngu.h"
#include "png.h"
// Constants
#define PNGU_SOURCE_BUFFER 1
#define PNGU_SOURCE_DEVICE 2
#define _SHIFTL(v, s, w) \
((PNGU_u32) (((PNGU_u32)(v) & ((0x01 << (w)) - 1)) << (s)))
#define _SHIFTR(v, s, w) \
((PNGU_u32)(((PNGU_u32)(v) >> (s)) & ((0x01 << (w)) - 1)))
// Prototypes of helper functions
int pngu_info (IMGCTX ctx);
int pngu_decode (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, PNGU_u32 stripAlpha);
void pngu_free_info (IMGCTX ctx);
void pngu_read_data_from_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
void pngu_write_data_to_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
void pngu_flush_data_to_buffer (png_structp png_ptr);
int pngu_clamp (int value, int min, int max);
// PNGU Image context struct
struct _IMGCTX
{
int source;
void *buffer;
char *filename;
PNGU_u32 cursor;
PNGU_u32 propRead;
PNGUPROP prop;
PNGU_u32 infoRead;
png_structp png_ptr;
png_infop info_ptr;
FILE *fd;
png_bytep *row_pointers;
png_bytep img_data;
};
// PNGU Implementation //
IMGCTX PNGU_SelectImageFromBuffer (const void *buffer)
{
IMGCTX ctx = NULL;
if (!buffer)
return NULL;
ctx = malloc (sizeof (struct _IMGCTX));
if (!ctx)
return NULL;
ctx->buffer = (void *) buffer;
ctx->source = PNGU_SOURCE_BUFFER;
ctx->cursor = 0;
ctx->filename = NULL;
ctx->propRead = 0;
ctx->infoRead = 0;
return ctx;
}
IMGCTX PNGU_SelectImageFromDevice (const char *filename)
{
IMGCTX ctx = NULL;
if (!filename)
return NULL;
ctx = malloc (sizeof (struct _IMGCTX));
if (!ctx)
return NULL;
ctx->buffer = NULL;
ctx->source = PNGU_SOURCE_DEVICE;
ctx->cursor = 0;
ctx->filename = malloc (strlen (filename) + 1);
if (!ctx->filename)
{
free (ctx);
return NULL;
}
strcpy(ctx->filename, filename);
ctx->propRead = 0;
ctx->infoRead = 0;
return ctx;
}
void PNGU_ReleaseImageContext (IMGCTX ctx)
{
if (!ctx)
return;
if (ctx->filename)
free (ctx->filename);
if ((ctx->propRead) && (ctx->prop.trans))
free (ctx->prop.trans);
pngu_free_info (ctx);
free (ctx);
}
int PNGU_GetImageProperties (IMGCTX ctx, PNGUPROP *imgprop)
{
int res;
if (!ctx->propRead)
{
res = pngu_info (ctx);
if (res != PNGU_OK)
return res;
}
*imgprop = ctx->prop;
return PNGU_OK;
}
int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
{
int result;
PNGU_u32 x, y, buffWidth;
// width needs to be divisible by two
if (width % 2)
return PNGU_ODD_WIDTH;
// stride needs to be divisible by two
if (stride % 2)
return PNGU_ODD_STRIDE;
result = pngu_decode (ctx, width, height, 1);
if (result != PNGU_OK)
return result;
// Copy image to the output buffer
buffWidth = (width + stride) / 2;
for (y = 0; y < height; y++)
for (x = 0; x < (width / 2); x++)
((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),
*(ctx->row_pointers[y]+x*6+3), *(ctx->row_pointers[y]+x*6+4), *(ctx->row_pointers[y]+x*6+5));
// Free resources
free (ctx->img_data);
free (ctx->row_pointers);
// Success
return PNGU_OK;
}
int PNGU_DecodeToRGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
{
int result;
PNGU_u32 x, y, buffWidth;
result = pngu_decode (ctx, width, height, 1);
if (result != PNGU_OK)
return result;
buffWidth = width + stride;
// Copy image to the output buffer
for (y = 0; y < height; y++)
for (x = 0; x < width; x++)
((PNGU_u16 *)buffer)[y*buffWidth+x] =
(((PNGU_u16) (ctx->row_pointers[y][x*3] & 0xF8)) << 8) |
(((PNGU_u16) (ctx->row_pointers[y][x*3+1] & 0xFC)) << 3) |
(((PNGU_u16) (ctx->row_pointers[y][x*3+2] & 0xF8)) >> 3);
// Free resources
free (ctx->img_data);
free (ctx->row_pointers);
// Success
return PNGU_OK;
}
int PNGU_DecodeToRGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride, PNGU_u8 default_alpha)
{
int result;
PNGU_u32 x, y, buffWidth;
result = pngu_decode (ctx, width, height, 0);
if (result != PNGU_OK)
return result;
buffWidth = width + stride;
// 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 < height; y++)
memcpy (buffer + (y * buffWidth * 4), ctx->row_pointers[y], width * 4);
}
else
{
// No alpha channel present, copy image to the output buffer
for (y = 0; y < height; y++)
for (x = 0; x < width; x++)
((PNGU_u32 *)buffer)[y*buffWidth+x] =
(((PNGU_u32) ctx->row_pointers[y][x*3]) << 24) |
(((PNGU_u32) ctx->row_pointers[y][x*3+1]) << 16) |
(((PNGU_u32) ctx->row_pointers[y][x*3+2]) << 8) |
((PNGU_u32) default_alpha);
}
// Free resources
free (ctx->img_data);
free (ctx->row_pointers);
// Success
return PNGU_OK;
}
int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer)
{
int result;
PNGU_u32 x, y, qwidth, qheight;
// width and height need to be divisible by four
if ((width % 4) || (height % 4))
return PNGU_INVALID_WIDTH_OR_HEIGHT;
result = pngu_decode (ctx, width, height, 1);
if (result != PNGU_OK)
return result;
// Copy image to the output buffer
qwidth = width / 4;
qheight = height / 4;
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] =
(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((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] =
(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((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] =
(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((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] =
(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) |
(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) |
(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
}
// Free resources
free (ctx->img_data);
free (ctx->row_pointers);
// Success
return PNGU_OK;
}
int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha)
{
int result;
PNGU_u32 x, y, qwidth, qheight;
PNGU_u64 alphaMask;
// width and height need to be divisible by four
if ((width % 4) || (height % 4))
return PNGU_INVALID_WIDTH_OR_HEIGHT;
result = pngu_decode (ctx, width, height, 0);
if (result != PNGU_OK)
return result;
// Init some vars
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) * 4;
PNGU_u64 tmp;
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));
// If first pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
else
tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
// If second pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
if ((fieldA & 0xE0ULL) == 0xE0ULL)
tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
else
tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
// If third pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
else
tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
// If fourth pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
if ((fieldB & 0xE0ULL) == 0xE0ULL)
tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
else
tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
((PNGU_u64 *) buffer)[blockbase] = tmp;
fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16));
fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+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+1] = tmp;
fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16));
fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+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+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
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)
{
int result;
PNGU_u32 x, y, qwidth, qheight;
PNGU_u64 alphaMask;
// width and height need to be divisible by four
if ((width % 4) || (height % 4))
return PNGU_INVALID_WIDTH_OR_HEIGHT;
result = pngu_decode (ctx, width, height, 0);
if (result != PNGU_OK)
return result;
// Init some variables
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
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;
}
// Coded by Tantric for libwiigui (http://code.google.com/p/libwiigui)
int PNGU_EncodeFromRGB (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
{
png_uint_32 rowbytes;
PNGU_u32 y;
// 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, pngu_flush_data_to_buffer);
}
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
rowbytes = width * 3;
if (rowbytes % 4)
rowbytes = ((rowbytes >>2) + 1) <<2; // Add extra padding so each row starts in a 4 byte boundary
ctx->img_data = malloc(rowbytes * height);
memset(ctx->img_data, 0, 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);
memset(ctx->row_pointers, 0, 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;
}
for (y = 0; y < height; ++y)
{
ctx->row_pointers[y] = buffer + (y * rowbytes);
}
// 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 ctx->cursor;
}
// Coded by Tantric for libwiigui (http://code.google.com/p/libwiigui)
int PNGU_EncodeFromGXTexture (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
{
int res;
PNGU_u32 x,y, tmpy1, tmpy2, tmpyWid, tmpxy;
unsigned char * ptr = (unsigned char*)buffer;
unsigned char * tmpbuffer = (unsigned char *)malloc(width*height*3);
memset(tmpbuffer, 0, width*height*3);
png_uint_32 offset;
for(y=0; y < height; y++)
{
tmpy1 = y * 640*3;
tmpy2 = y%4 << 2;
tmpyWid = (((y >> 2)<<4)*width);
for(x=0; x < width; x++)
{
offset = tmpyWid + ((x >> 2)<<6) + ((tmpy2+ x%4 ) << 1);
tmpxy = x * 3 + tmpy1;
tmpbuffer[tmpxy ] = ptr[offset+1]; // R
tmpbuffer[tmpxy+1] = ptr[offset+32]; // G
tmpbuffer[tmpxy+2] = ptr[offset+33]; // B
}
}
res = PNGU_EncodeFromRGB (ctx, width, height, tmpbuffer, stride);
free(tmpbuffer);
return res;
}
// Coded by Crayon for GRRLIB (http://code.google.com/p/grrlib)
int PNGU_EncodeFromEFB (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, PNGU_u32 stride)
{
int res;
PNGU_u32 x,y, tmpy, tmpxy, regval, val;
unsigned char * tmpbuffer = (unsigned char *)malloc(width*height*3);
memset(tmpbuffer, 0, width*height*3);
for(y=0; y < height; y++)
{
tmpy = y * 640*3;
for(x=0; x < width; x++)
{
regval = 0xc8000000|(_SHIFTL(x,2,10));
regval = (regval&~0x3FF000)|(_SHIFTL(y,12,10));
val = *(PNGU_u32*)regval;
tmpxy = x * 3 + tmpy;
tmpbuffer[tmpxy ] = _SHIFTR(val,16,8); // R
tmpbuffer[tmpxy+1] = _SHIFTR(val,8,8); // G
tmpbuffer[tmpxy+2] = val&0xff; // B
}
}
res = PNGU_EncodeFromRGB (ctx, width, height, tmpbuffer, stride);
free(tmpbuffer);
return res;
}
int PNGU_EncodeFromYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
{
png_uint_32 rowbytes;
PNGU_u32 x, y, buffWidth;
// 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, pngu_flush_data_to_buffer);
}
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
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
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, cb1, cr1, y2, cb2, cr2, cb, cr;
y1 = (299 * r1 + 587 * g1 + 114 * b1) / 1000;
cb1 = (-16874 * r1 - 33126 * g1 + 50000 * b1 + 12800000) / 100000;
cr1 = (50000 * r1 - 41869 * g1 - 8131 * b1 + 12800000) / 100000;
y2 = (299 * r2 + 587 * g2 + 114 * b2) / 1000;
cb2 = (-16874 * r2 - 33126 * g2 + 50000 * b2 + 12800000) / 100000;
cr2 = (50000 * r2 - 41869 * g2 - 8131 * b2 + 12800000) / 100000;
cb = (cb1 + cb2) >> 1;
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, g, b;
r = 1.371f * (val[3] - 128);
g = - 0.698f * (val[3] - 128) - 0.336f * (val[1] - 128);
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];
png_uint_32 width;
png_uint_32 height;
png_color_16p background;
png_bytep trans;
png_color_16p trans_values;
int scale, i;
// 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_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
scale = 1;
if (ctx->prop.imgBitDepth == 16)
scale = 256;
// Query background color, if any.
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.
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)
{
png_uint_32 rowbytes;
int 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;
// Check if color type is supported by PNGU
if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_PALETTE) || (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);
// Flush transformations
png_read_update_info (ctx->png_ptr, ctx->info_ptr);
// Allocate memory to store the image
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
png_read_image (ctx->png_ptr, ctx->row_pointers);
// 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;
}
}
// Custom data provider function used for reading from memory buffers.
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);
memcpy (data, ctx->buffer + ctx->cursor, length);
ctx->cursor += length;
}
// Custom data writer function used for writing to memory buffers.
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;
}
// Custom data flusher function used for writing to memory buffers.
void pngu_flush_data_to_buffer (png_structp png_ptr)
{
// Nothing to do here
}
// 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;
}
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