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cwebp: add webpdec

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simple webp decoding, no metadata support

Change-Id: I2752fd1442c87513922878cbf72f001d45b631bc
This commit is contained in:
James Zern
2014-04-22 19:30:27 -07:00
committed by Pascal Massimino
parent 4a0e73904d
commit ddeb6ac802
7 changed files with 123 additions and 12 deletions
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examples/webpdec.c Normal file
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// WebP decode.
#include "./webpdec.h"
#include <stdio.h>
#include <stdlib.h>
#include "webp/decode.h"
#include "webp/encode.h"
#include "./example_util.h"
#include "./metadata.h"
int ReadWebP(const char* const in_file, WebPPicture* const pic,
int keep_alpha, Metadata* const metadata) {
int ok = 0;
size_t data_size = 0;
const uint8_t* data = NULL;
VP8StatusCode status = VP8_STATUS_OK;
WebPDecoderConfig config;
WebPDecBuffer* const output_buffer = &config.output;
WebPBitstreamFeatures* const bitstream = &config.input;
// TODO(jzern): add Exif/XMP/ICC extraction.
if (metadata != NULL) {
fprintf(stderr, "Warning: metadata extraction from WebP is unsupported.\n");
}
if (!WebPInitDecoderConfig(&config)) {
fprintf(stderr, "Library version mismatch!\n");
return 0;
}
if (ExUtilLoadWebP(in_file, &data, &data_size, bitstream)) {
const int has_alpha = keep_alpha && bitstream->has_alpha;
output_buffer->colorspace = has_alpha ? MODE_RGBA : MODE_RGB;
status = ExUtilDecodeWebP(data, data_size, 0, 0, &config);
if (status == VP8_STATUS_OK) {
const uint8_t* const rgba = output_buffer->u.RGBA.rgba;
const int stride = output_buffer->u.RGBA.stride;
pic->width = output_buffer->width;
pic->height = output_buffer->height;
pic->use_argb = 1;
ok = has_alpha ? WebPPictureImportRGBA(pic, rgba, stride)
: WebPPictureImportRGB(pic, rgba, stride);
}
}
if (status != VP8_STATUS_OK) {
ExUtilPrintWebPError(in_file, status);
}
free((void*)data);
WebPFreeDecBuffer(output_buffer);
return ok;
}
// -----------------------------------------------------------------------------