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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup imbuf
*/
#include <stdio.h>
#include <stdlib.h>
#include <webp/decode.h>
#include <webp/encode.h>
#include "BLI_fileops.h"
#include "BLI_utildefines.h"
#include "IMB_colormanagement.h"
#include "IMB_colormanagement_intern.h"
#include "IMB_filetype.h"
#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"
#include "MEM_guardedalloc.h"
bool imb_is_a_webp(const unsigned char *buf, size_t size)
{
if (WebPGetInfo(buf, size, NULL, NULL)) {
return true;
}
return false;
}
ImBuf *imb_loadwebp(const unsigned char *mem,
size_t size,
int flags,
char colorspace[IM_MAX_SPACE])
{
if (!imb_is_a_webp(mem, size)) {
return NULL;
}
colorspace_set_default_role(colorspace, IM_MAX_SPACE, COLOR_ROLE_DEFAULT_BYTE);
WebPBitstreamFeatures features;
if (WebPGetFeatures(mem, size, &features) != VP8_STATUS_OK) {
fprintf(stderr, "WebP: Failed to parse features\n");
return NULL;
}
const int planes = features.has_alpha ? 32 : 24;
ImBuf *ibuf = IMB_allocImBuf(features.width, features.height, planes, 0);
if (ibuf == NULL) {
fprintf(stderr, "WebP: Failed to allocate image memory\n");
return NULL;
}
if ((flags & IB_test) == 0) {
ibuf->ftype = IMB_FTYPE_WEBP;
imb_addrectImBuf(ibuf);
/* Flip the image during decoding to match Blender. */
unsigned char *last_row = (unsigned char *)(ibuf->rect + (ibuf->y - 1) * ibuf->x);
if (WebPDecodeRGBAInto(mem, size, last_row, (size_t)(ibuf->x) * ibuf->y * 4, -4 * ibuf->x) ==
NULL) {
fprintf(stderr, "WebP: Failed to decode image\n");
}
}
return ibuf;
}
bool imb_savewebp(struct ImBuf *ibuf, const char *name, int UNUSED(flags))
{
const int bytesperpixel = (ibuf->planes + 7) >> 3;
unsigned char *encoded_data, *last_row;
size_t encoded_data_size;
if (bytesperpixel == 3) {
/* We must convert the ImBuf RGBA buffer to RGB as WebP expects a RGB buffer. */
const size_t num_pixels = ibuf->x * ibuf->y;
const uint8_t *rgba_rect = (uint8_t *)ibuf->rect;
uint8_t *rgb_rect = MEM_mallocN(sizeof(uint8_t) * num_pixels * 3, "webp rgb_rect");
for (int i = 0; i < num_pixels; i++) {
rgb_rect[i * 3 + 0] = rgba_rect[i * 4 + 0];
rgb_rect[i * 3 + 1] = rgba_rect[i * 4 + 1];
rgb_rect[i * 3 + 2] = rgba_rect[i * 4 + 2];
}
last_row = (unsigned char *)(rgb_rect + (ibuf->y - 1) * ibuf->x * 3);
if (ibuf->foptions.quality == 100.0f) {
encoded_data_size = WebPEncodeLosslessRGB(
last_row, ibuf->x, ibuf->y, -3 * ibuf->x, &encoded_data);
}
else {
encoded_data_size = WebPEncodeRGB(
last_row, ibuf->x, ibuf->y, -3 * ibuf->x, ibuf->foptions.quality, &encoded_data);
}
MEM_freeN(rgb_rect);
}
else if (bytesperpixel == 4) {
last_row = (unsigned char *)(ibuf->rect + (ibuf->y - 1) * ibuf->x);
if (ibuf->foptions.quality == 100.0f) {
encoded_data_size = WebPEncodeLosslessRGBA(
last_row, ibuf->x, ibuf->y, -4 * ibuf->x, &encoded_data);
}
else {
encoded_data_size = WebPEncodeRGBA(
last_row, ibuf->x, ibuf->y, -4 * ibuf->x, ibuf->foptions.quality, &encoded_data);
}
}
else {
fprintf(stderr, "WebP: Unsupported bytes per pixel: %d for file: '%s'\n", bytesperpixel, name);
return false;
}
if (encoded_data != NULL) {
FILE *fp = BLI_fopen(name, "wb");
if (!fp) {
free(encoded_data);
fprintf(stderr, "WebP: Cannot open file for writing: '%s'\n", name);
return false;
}
fwrite(encoded_data, encoded_data_size, 1, fp);
free(encoded_data);
fclose(fp);
}
return true;
}
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