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https://github.com/webmproject/libwebp.git
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a9947c3244
we map the input file into memory, even in the non-stdin case. This is less efficient than letting the png/jpeg/... decoding libraries use fread()'s, but more general. Change-Id: I4501cb9a1daf69593eb8e3326c115cd8cbdf92fd
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// WebP decode.
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#include "./webpdec.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "webp/decode.h"
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#include "webp/encode.h"
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#include "./example_util.h"
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#include "./metadata.h"
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int ReadWebP(const uint8_t* const data, size_t data_size,
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WebPPicture* const pic,
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int keep_alpha, Metadata* const metadata) {
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int ok = 0;
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VP8StatusCode status = VP8_STATUS_OK;
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WebPDecoderConfig config;
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WebPDecBuffer* const output_buffer = &config.output;
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WebPBitstreamFeatures* const bitstream = &config.input;
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// TODO(jzern): add Exif/XMP/ICC extraction.
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if (metadata != NULL) {
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fprintf(stderr, "Warning: metadata extraction from WebP is unsupported.\n");
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}
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if (!WebPInitDecoderConfig(&config)) {
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fprintf(stderr, "Library version mismatch!\n");
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return 0;
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}
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status = WebPGetFeatures(data, data_size, bitstream);
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if (status != VP8_STATUS_OK) {
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ExUtilPrintWebPError("input data", status);
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return 0;
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}
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{
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const int has_alpha = keep_alpha && bitstream->has_alpha;
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// TODO(skal): use MODE_YUV(A), depending on the expected
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// input pic->use_argb. This would save some conversion steps.
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output_buffer->colorspace = has_alpha ? MODE_RGBA : MODE_RGB;
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status = ExUtilDecodeWebP(data, data_size, 0, &config);
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if (status == VP8_STATUS_OK) {
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const uint8_t* const rgba = output_buffer->u.RGBA.rgba;
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const int stride = output_buffer->u.RGBA.stride;
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pic->width = output_buffer->width;
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pic->height = output_buffer->height;
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ok = has_alpha ? WebPPictureImportRGBA(pic, rgba, stride)
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: WebPPictureImportRGB(pic, rgba, stride);
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}
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}
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if (status != VP8_STATUS_OK) {
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ExUtilPrintWebPError("input data", status);
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}
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WebPFreeDecBuffer(output_buffer);
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return ok;
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}
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// -----------------------------------------------------------------------------
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