mirror of
https://github.com/Polprzewodnikowy/N64FlashcartMenu.git
synced 2024-12-04 16:24:14 +01:00
109 lines
2.8 KiB
C
109 lines
2.8 KiB
C
#include <libspng/spng/spng.h>
|
|
|
|
#include "path.h"
|
|
#include "png_decoder.h"
|
|
|
|
|
|
png_err_t png_decode (char *path, surface_t *image, int max_width, int max_height) {
|
|
spng_ctx *ctx;
|
|
enum spng_errno err = SPNG_OK;
|
|
path_t *file_path;
|
|
FILE *file;
|
|
size_t image_size;
|
|
struct spng_ihdr ihdr;
|
|
struct spng_row_info row_info;
|
|
uint8_t *row_buffer;
|
|
uint16_t *image_buffer;
|
|
|
|
image->buffer = NULL;
|
|
|
|
if ((ctx = spng_ctx_new(SPNG_CTX_IGNORE_ADLER32)) == NULL) {
|
|
return PNG_ERR_OUT_OF_MEM;
|
|
}
|
|
|
|
if (spng_set_crc_action(ctx, SPNG_CRC_USE, SPNG_CRC_USE) != SPNG_OK) {
|
|
spng_ctx_free(ctx);
|
|
return PNG_ERR_INT;
|
|
}
|
|
|
|
if (spng_set_image_limits(ctx, max_width, max_height) != SPNG_OK) {
|
|
spng_ctx_free(ctx);
|
|
return PNG_ERR_INT;
|
|
}
|
|
|
|
file_path = path_init("sd:/");
|
|
path_append(file_path, path);
|
|
if ((file = fopen(path_get(file_path), "r")) == NULL) {
|
|
spng_ctx_free(ctx);
|
|
path_free(file_path);
|
|
return PNG_ERR_NO_FILE;
|
|
}
|
|
path_free(file_path);
|
|
|
|
if (spng_set_png_file(ctx, file) != SPNG_OK) {
|
|
spng_ctx_free(ctx);
|
|
fclose(file);
|
|
return PNG_ERR_INT;
|
|
}
|
|
|
|
if (spng_decoded_image_size(ctx, SPNG_FMT_RGB8, &image_size) != SPNG_OK) {
|
|
spng_ctx_free(ctx);
|
|
fclose(file);
|
|
return PNG_ERR_BAD_FILE;
|
|
}
|
|
|
|
if (spng_decode_image(ctx, NULL, image_size, SPNG_FMT_RGB8, SPNG_DECODE_PROGRESSIVE) != SPNG_OK) {
|
|
spng_ctx_free(ctx);
|
|
fclose(file);
|
|
return PNG_ERR_BAD_FILE;
|
|
}
|
|
|
|
if (spng_get_ihdr(ctx, &ihdr) != SPNG_OK) {
|
|
spng_ctx_free(ctx);
|
|
fclose(file);
|
|
return PNG_ERR_BAD_FILE;
|
|
}
|
|
|
|
*image = surface_alloc(FMT_RGBA16, ihdr.width, ihdr.height);
|
|
if (image->buffer == NULL) {
|
|
spng_ctx_free(ctx);
|
|
fclose(file);
|
|
return PNG_ERR_OUT_OF_MEM;
|
|
}
|
|
|
|
if ((row_buffer = malloc(ihdr.width * 3)) == NULL) {
|
|
spng_ctx_free(ctx);
|
|
fclose(file);
|
|
surface_free(image);
|
|
return PNG_ERR_OUT_OF_MEM;
|
|
}
|
|
|
|
do {
|
|
if ((err = spng_get_row_info(ctx, &row_info)) != SPNG_OK) {
|
|
break;
|
|
}
|
|
|
|
err = spng_decode_row(ctx, row_buffer, ihdr.width * 3);
|
|
if (err == SPNG_OK || err == SPNG_EOI) {
|
|
image_buffer = image->buffer + (row_info.row_num * image->stride);
|
|
for (int i = 0; i < ihdr.width * 3; i += 3) {
|
|
uint8_t r = row_buffer[i + 0] >> 3;
|
|
uint8_t g = row_buffer[i + 1] >> 3;
|
|
uint8_t b = row_buffer[i + 2] >> 3;
|
|
*image_buffer++ = (r << 11) | (g << 6) | (b << 1) | 1;
|
|
}
|
|
}
|
|
} while (err == SPNG_OK);
|
|
|
|
spng_ctx_free(ctx);
|
|
free(row_buffer);
|
|
fclose(file);
|
|
|
|
if (err != SPNG_EOI) {
|
|
surface_free(image);
|
|
return PNG_ERR_BAD_FILE;
|
|
}
|
|
|
|
return PNG_OK;
|
|
}
|