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050cae3bd2
This patch is adding support for google webp image format, if you don't know it a quick recap is to say that according to their tests they claim it is better than png and jpeg. Follow the link below for some more details: https://developers.google.com/speed/webp/ Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* load_webp.c - load WEBP image from file
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*
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* Raster graphics library
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*
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* Copyright (c) 2014 Window Maker Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <webp/decode.h>
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#include "wraster.h"
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#include "imgformat.h"
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RImage *RLoadWEBP(const char *file_name)
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{
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FILE *file;
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RImage *image = NULL;
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char buffer[20];
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int raw_data_size;
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int r;
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uint8_t *raw_data;
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WebPBitstreamFeatures features;
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uint8_t *ret = NULL;
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file = fopen(file_name, "rb");
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if (!file) {
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RErrorCode = RERR_OPEN;
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return NULL;
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}
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if (!fread(buffer, sizeof(buffer), 1, file)) {
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RErrorCode = RERR_BADIMAGEFILE;
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fclose(file);
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return NULL;
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}
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if (!(buffer[ 0] == 'R' && buffer[ 1] == 'I' && buffer[ 2] == 'F' && buffer[ 3] == 'F' &&
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buffer[ 8] == 'W' && buffer[ 9] == 'E' && buffer[10] == 'B' && buffer[11] == 'P' &&
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buffer[12] == 'V' && buffer[13] == 'P' && buffer[14] == '8' &&
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#if WEBP_DECODER_ABI_VERSION < 0x0003 /* old versions don't support WEBPVP8X and WEBPVP8L */
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buffer[15] == ' ')) {
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#else
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(buffer[15] == ' ' || buffer[15] == 'X' || buffer[15] == 'L'))) {
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#endif
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RErrorCode = RERR_BADFORMAT;
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fclose(file);
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return NULL;
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}
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fseek(file, 0L, SEEK_END);
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raw_data_size = ftell(file);
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if (raw_data_size <= 0) {
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fprintf(stderr, "wrlib: Failed to find the WEBP file size for \"%s\"\n", file_name);
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RErrorCode = RERR_BADIMAGEFILE;
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fclose(file);
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return NULL;
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}
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raw_data = (uint8_t *) malloc(raw_data_size);
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if (!raw_data) {
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RErrorCode = RERR_NOMEMORY;
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fclose(file);
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return NULL;
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}
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fseek(file, 0L, SEEK_SET);
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r = fread(raw_data, 1, raw_data_size, file);
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fclose(file);
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if (r != raw_data_size) {
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RErrorCode = RERR_READ;
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free(raw_data);
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return NULL;
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}
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if (WebPGetFeatures(raw_data, raw_data_size, &features) != VP8_STATUS_OK) {
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fprintf(stderr, "wrlib: WebPGetFeatures has failed on \"%s\"\n", file_name);
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RErrorCode = RERR_BADIMAGEFILE;
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free(raw_data);
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return NULL;
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}
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if (features.has_alpha) {
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image = RCreateImage(features.width, features.height, True);
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if (!image) {
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RErrorCode = RERR_NOMEMORY;
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free(raw_data);
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return NULL;
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}
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ret = WebPDecodeRGBAInto(raw_data, raw_data_size, image->data,
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features.width * features.height * 4,
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features.width * 4);
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} else {
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image = RCreateImage(features.width, features.height, False);
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if (!image) {
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RErrorCode = RERR_NOMEMORY;
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free(raw_data);
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return NULL;
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}
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ret = WebPDecodeRGBInto(raw_data, raw_data_size, image->data,
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features.width * features.height * 3,
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features.width * 3);
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}
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free(raw_data);
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if (!ret) {
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fprintf(stderr, "wrlib: Failed to decode WEBP from file \"%s\"\n", file_name);
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RErrorCode = RERR_BADIMAGEFILE;
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RReleaseImage(image);
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return NULL;
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}
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return image;
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}
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