static uint8_t* Decode(WEBP_CSP_MODE mode, const uint8_t* const data,
size_t data_size, int* const width, int* const height,
WebPDecBuffer* const keep_info) {
WebPDecParams params;
WebPDecBuffer output;
WebPInitDecBuffer(&output);
WebPResetDecParams(¶ms);
params.output = &output;
output.colorspace = mode;
// Retrieve (and report back) the required dimensions from bitstream.
if (!WebPGetInfo(data, data_size, &output.width, &output.height)) {
return NULL;
}
if (width != NULL) *width = output.width;
if (height != NULL) *height = output.height;
// Decode
if (DecodeInto(data, data_size, ¶ms) != VP8_STATUS_OK) {
return NULL;
}
if (keep_info != NULL) { // keep track of the side-info
WebPCopyDecBuffer(&output, keep_info);
}
// return decoded samples (don't clear 'output'!)
return WebPIsRGBMode(mode) ? output.u.RGBA.rgba : output.u.YUVA.y;
}
uint8_t* WebPDecodeYUVInto(const uint8_t* data, size_t data_size,
uint8_t* luma, size_t luma_size, int luma_stride,
uint8_t* u, size_t u_size, int u_stride,
uint8_t* v, size_t v_size, int v_stride) {
WebPDecParams params;
WebPDecBuffer output;
if (luma == NULL) return NULL;
WebPInitDecBuffer(&output);
WebPResetDecParams(¶ms);
params.output = &output;
output.colorspace = MODE_YUV;
output.u.YUVA.y = luma;
output.u.YUVA.y_stride = luma_stride;
output.u.YUVA.y_size = luma_size;
output.u.YUVA.u = u;
output.u.YUVA.u_stride = u_stride;
output.u.YUVA.u_size = u_size;
output.u.YUVA.v = v;
output.u.YUVA.v_stride = v_stride;
output.u.YUVA.v_size = v_size;
output.is_external_memory = 1;
if (DecodeInto(data, data_size, ¶ms) != VP8_STATUS_OK) {
return NULL;
}
return luma;
}
static uint8_t* Decode(WEBP_CSP_MODE mode, const uint8_t* const data,
size_t data_size, int* const width, int* const height,
WebPDecBuffer* const keep_info) {
WebPDecParams params;
WebPDecBuffer output;
WebPInitDecBuffer(&output);
WebPResetDecParams(¶ms);
params.output = &output;
output.colorspace = mode;
if (!WebPGetInfo(data, data_size, &output.width, &output.height)) {
return NULL;
}
if (width != NULL) *width = output.width;
if (height != NULL) *height = output.height;
if (DecodeInto(data, data_size, ¶ms) != VP8_STATUS_OK) {
return NULL;
}
if (keep_info != NULL) {
WebPCopyDecBuffer(&output, keep_info);
}
return WebPIsRGBMode(mode) ? output.u.RGBA.rgba : output.u.YUVA.y;
}
/*
* Setup state for decoding a strip.
*/
static int
TWebPPreDecode(TIFF* tif, uint16 s)
{
static const char module[] = "TWebPPreDecode";
uint32 segment_width, segment_height;
WebPState* sp = DecoderState(tif);
TIFFDirectory* td = &tif->tif_dir;
(void) s;
assert(sp != NULL);
if (isTiled(tif)) {
segment_width = td->td_tilewidth;
segment_height = td->td_tilelength;
} else {
segment_width = td->td_imagewidth;
segment_height = td->td_imagelength - tif->tif_row;
if (segment_height > td->td_rowsperstrip)
segment_height = td->td_rowsperstrip;
}
if( (sp->state & LSTATE_INIT_DECODE) == 0 )
tif->tif_setupdecode(tif);
if (sp->psDecoder != NULL) {
WebPIDelete(sp->psDecoder);
WebPFreeDecBuffer(&sp->sDecBuffer);
sp->psDecoder = NULL;
}
sp->last_y = 0;
WebPInitDecBuffer(&sp->sDecBuffer);
sp->sDecBuffer.is_external_memory = 0;
sp->sDecBuffer.width = segment_width;
sp->sDecBuffer.height = segment_height;
sp->sDecBuffer.u.RGBA.stride = segment_width * sp->nSamples;
sp->sDecBuffer.u.RGBA.size = segment_width * sp->nSamples * segment_height;
if (sp->nSamples > 3) {
sp->sDecBuffer.colorspace = MODE_RGBA;
} else {
sp->sDecBuffer.colorspace = MODE_RGB;
}
sp->psDecoder = WebPINewDecoder(&sp->sDecBuffer);
if (sp->psDecoder == NULL) {
TIFFErrorExt(tif->tif_clientdata, module,
"Unable to allocate WebP decoder.");
return 0;
}
return 1;
}
int WebPInitDecoderConfigInternal(WebPDecoderConfig* config,
int version) {
if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_DECODER_ABI_VERSION)) {
return 0; // version mismatch
}
if (config == NULL) {
return 0;
}
memset(config, 0, sizeof(*config));
DefaultFeatures(&config->input);
WebPInitDecBuffer(&config->output);
return 1;
}
void
nsWEBPDecoder::InitInternal()
{
if (!WebPInitDecBuffer(&mDecBuf)) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
mLastLine = 0;
mDecBuf.colorspace = MODE_rgbA;
mDecoder = WebPINewDecoder(&mDecBuf);
if (!mDecoder) {
PostDecoderError(NS_ERROR_FAILURE);
}
}
VP8StatusCode WebPDecode(const uint8_t* data, size_t data_size,
WebPDecoderConfig* config) {
WebPDecParams params;
VP8StatusCode status;
if (config == NULL) {
return VP8_STATUS_INVALID_PARAM;
}
status = GetFeatures(data, data_size, &config->input);
if (status != VP8_STATUS_OK) {
if (status == VP8_STATUS_NOT_ENOUGH_DATA) {
return VP8_STATUS_BITSTREAM_ERROR; // Not-enough-data treated as error.
}
return status;
}
WebPResetDecParams(¶ms);
params.options = &config->options;
params.output = &config->output;
if (WebPAvoidSlowMemory(params.output, &config->input)) {
// decoding to slow memory: use a temporary in-mem buffer to decode into.
WebPDecBuffer in_mem_buffer;
WebPInitDecBuffer(&in_mem_buffer);
in_mem_buffer.colorspace = config->output.colorspace;
in_mem_buffer.width = config->input.width;
in_mem_buffer.height = config->input.height;
params.output = &in_mem_buffer;
status = DecodeInto(data, data_size, ¶ms);
if (status == VP8_STATUS_OK) { // do the slow-copy
status = WebPCopyDecBufferPixels(&in_mem_buffer, &config->output);
}
WebPFreeDecBuffer(&in_mem_buffer);
} else {
status = DecodeInto(data, data_size, ¶ms);
}
return status;
}
// Helpers
static uint8_t* DecodeIntoRGBABuffer(WEBP_CSP_MODE colorspace,
const uint8_t* const data,
size_t data_size,
uint8_t* const rgba,
int stride, size_t size) {
WebPDecParams params;
WebPDecBuffer buf;
if (rgba == NULL) {
return NULL;
}
WebPInitDecBuffer(&buf);
WebPResetDecParams(¶ms);
params.output = &buf;
buf.colorspace = colorspace;
buf.u.RGBA.rgba = rgba;
buf.u.RGBA.stride = stride;
buf.u.RGBA.size = size;
buf.is_external_memory = 1;
if (DecodeInto(data, data_size, ¶ms) != VP8_STATUS_OK) {
return NULL;
}
return rgba;
}
bool WEBPImageDecoder::decode(const uint8_t* dataBytes, size_t dataSize, bool onlySize, size_t frameIndex)
{
if (failed())
return false;
if (!ImageDecoder::isSizeAvailable()) {
static const size_t imageHeaderSize = 30;
if (dataSize < imageHeaderSize)
return false;
int width, height;
WebPBitstreamFeatures features;
if (WebPGetFeatures(dataBytes, dataSize, &features) != VP8_STATUS_OK)
return setFailed();
width = features.width;
height = features.height;
m_formatFlags = features.has_alpha ? ALPHA_FLAG : 0;
if (!setSize(width, height))
return setFailed();
}
ASSERT(ImageDecoder::isSizeAvailable());
if (onlySize)
return true;
ASSERT(m_frameBufferCache.size() > frameIndex);
ImageFrame& buffer = m_frameBufferCache[frameIndex];
ASSERT(buffer.status() != ImageFrame::FrameComplete);
if (buffer.status() == ImageFrame::FrameEmpty) {
if (!buffer.setSize(size().width(), size().height()))
return setFailed();
buffer.setStatus(ImageFrame::FramePartial);
// The buffer is transparent outside the decoded area while the image is loading.
// The correct value of 'hasAlpha' for the frame will be set when it is fully decoded.
buffer.setHasAlpha(true);
buffer.setOriginalFrameRect(IntRect(IntPoint(), size()));
}
const IntRect& frameRect = buffer.originalFrameRect();
if (!m_decoder) {
WEBP_CSP_MODE mode = outputMode(m_formatFlags & ALPHA_FLAG);
if (!m_premultiplyAlpha)
mode = outputMode(false);
#if USE(QCMSLIB)
if ((m_formatFlags & ICCP_FLAG) && !ignoresGammaAndColorProfile())
mode = MODE_RGBA; // Decode to RGBA for input to libqcms.
#endif
WebPInitDecBuffer(&m_decoderBuffer);
m_decoderBuffer.colorspace = mode;
m_decoderBuffer.u.RGBA.stride = size().width() * sizeof(ImageFrame::PixelData);
m_decoderBuffer.u.RGBA.size = m_decoderBuffer.u.RGBA.stride * frameRect.height();
m_decoderBuffer.is_external_memory = 1;
m_decoder = WebPINewDecoder(&m_decoderBuffer);
if (!m_decoder)
return setFailed();
}
m_decoderBuffer.u.RGBA.rgba = reinterpret_cast<uint8_t*>(buffer.getAddr(frameRect.x(), frameRect.y()));
switch (WebPIUpdate(m_decoder, dataBytes, dataSize)) {
case VP8_STATUS_OK:
applyPostProcessing(frameIndex);
buffer.setHasAlpha((m_formatFlags & ALPHA_FLAG) || m_frameBackgroundHasAlpha);
buffer.setStatus(ImageFrame::FrameComplete);
clearDecoder();
return true;
case VP8_STATUS_SUSPENDED:
if (!isAllDataReceived() && !frameIsCompleteAtIndex(frameIndex)) {
applyPostProcessing(frameIndex);
return false;
}
// FALLTHROUGH
default:
clear();
return setFailed();
}
}
bool WEBPImageDecoder::decodeSingleFrame(const uint8_t* dataBytes,
size_t dataSize,
size_t frameIndex) {
if (failed())
return false;
ASSERT(isDecodedSizeAvailable());
ASSERT(m_frameBufferCache.size() > frameIndex);
ImageFrame& buffer = m_frameBufferCache[frameIndex];
ASSERT(buffer.getStatus() != ImageFrame::FrameComplete);
if (buffer.getStatus() == ImageFrame::FrameEmpty) {
if (!buffer.setSizeAndColorSpace(size().width(), size().height(),
colorSpace()))
return setFailed();
buffer.setStatus(ImageFrame::FramePartial);
// The buffer is transparent outside the decoded area while the image is
// loading. The correct alpha value for the frame will be set when it is
// fully decoded.
buffer.setHasAlpha(true);
buffer.setOriginalFrameRect(IntRect(IntPoint(), size()));
}
const IntRect& frameRect = buffer.originalFrameRect();
if (!m_decoder) {
WEBP_CSP_MODE mode = outputMode(m_formatFlags & ALPHA_FLAG);
if (!m_premultiplyAlpha)
mode = outputMode(false);
if (colorTransform()) {
// Swizzling between RGBA and BGRA is zero cost in a color transform.
// So when we have a color transform, we should decode to whatever is
// easiest for libwebp, and then let the color transform swizzle if
// necessary.
// Lossy webp is encoded as YUV (so RGBA and BGRA are the same cost).
// Lossless webp is encoded as BGRA. This means decoding to BGRA is
// either faster or the same cost as RGBA.
mode = MODE_BGRA;
}
WebPInitDecBuffer(&m_decoderBuffer);
m_decoderBuffer.colorspace = mode;
m_decoderBuffer.u.RGBA.stride =
size().width() * sizeof(ImageFrame::PixelData);
m_decoderBuffer.u.RGBA.size =
m_decoderBuffer.u.RGBA.stride * frameRect.height();
m_decoderBuffer.is_external_memory = 1;
m_decoder = WebPINewDecoder(&m_decoderBuffer);
if (!m_decoder)
return setFailed();
}
m_decoderBuffer.u.RGBA.rgba =
reinterpret_cast<uint8_t*>(buffer.getAddr(frameRect.x(), frameRect.y()));
switch (WebPIUpdate(m_decoder, dataBytes, dataSize)) {
case VP8_STATUS_OK:
applyPostProcessing(frameIndex);
buffer.setHasAlpha((m_formatFlags & ALPHA_FLAG) ||
m_frameBackgroundHasAlpha);
buffer.setStatus(ImageFrame::FrameComplete);
clearDecoder();
return true;
case VP8_STATUS_SUSPENDED:
if (!isAllDataReceived() && !frameIsCompleteAtIndex(frameIndex)) {
applyPostProcessing(frameIndex);
return false;
}
// FALLTHROUGH
default:
clear();
return setFailed();
}
}
