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#include "webp.h"
#include <stdlib.h>
#include <stdio.h>
#include <webp/decode.h>
#define LOG_MODULE "webp"
#define LOG_ENABLE_DBG 0
#include "log.h"
#include "stride.h"
pixman_image_t *
webp_load(FILE *fp, const char *path)
{
uint8_t *file_data = NULL;
uint8_t *image_data = NULL;
size_t image_size;
bool ok = false;
pixman_image_t *pix = NULL;
pixman_format_code_t format;
int width, height, stride;
if (fseek(fp, 0, SEEK_END) < 0) {
LOG_ERRNO("%s: failed to seek to end of file", path);
return NULL;
}
image_size = ftell(fp);
if (fseek(fp, 0, SEEK_SET) < 0) {
LOG_ERRNO("%s: failed to seek to beginning of file", path);
return NULL;
}
if (!(file_data = WebPMalloc(image_size + 1))) {
goto out;
}
clearerr(fp);
if (fread(file_data, image_size, 1, fp) != image_size && ferror(fp)) {
LOG_ERRNO("%s: failed to read", path);
goto out;
}
file_data[image_size] = '\0';
/* Verify it is a webp image */
if (!WebPGetInfo(file_data, image_size, NULL, NULL)) {
LOG_DBG("%s: not a WebP file", path);
goto out;
}
image_data = WebPDecodeRGBA(file_data, image_size, &width, &height);
if (image_data == NULL) {
goto out;
}
format = PIXMAN_x8b8g8r8;
stride = stride_for_format_and_width(format, width);
for (uint32_t *abgr = (uint32_t *)image_data;
abgr < (uint32_t *)(image_data + (size_t)width * (size_t)height * 4);
abgr++) {
uint8_t alpha = (*abgr >> 24) & 0xff;
uint8_t red = (*abgr >> 16) & 0xff;
uint8_t green = (*abgr >> 8) & 0xff;
uint8_t blue = (*abgr >> 0) & 0xff;
if (alpha == 0xff)
continue;
if (alpha == 0x00)
blue = green = red = 0x00;
else {
blue = blue * alpha / 0xff;
green = green * alpha / 0xff;
red = red * alpha / 0xff;
}
*abgr = (uint32_t)alpha << 24 | red << 16 | green << 8 | blue;
}
ok = NULL != (pix = pixman_image_create_bits_no_clear(
format, width, height, (uint32_t *)image_data, stride));
if (!ok) {
LOG_ERR("%s: failed to instantiate pixman image", path);
goto out;
}
out:
WebPFree(file_data);
if (!ok)
WebPFree(image_data);
return pix;
}
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