LexerTransition<nsIconDecoder::State>
nsIconDecoder::ReadRowOfPixels(const char* aData, size_t aLength)
{
MOZ_ASSERT(aLength % 4 == 0, "Rows should contain a multiple of four bytes");
auto result = mPipe.WritePixels<uint32_t>([&]() -> NextPixel<uint32_t> {
if (aLength == 0) {
return AsVariant(WriteState::NEED_MORE_DATA); // Done with this row.
}
uint32_t pixel;
memcpy(&pixel, aData, 4);
aData += 4;
aLength -= 4;
return AsVariant(pixel);
});
MOZ_ASSERT(result != WriteState::FAILURE);
Maybe<SurfaceInvalidRect> invalidRect = mPipe.TakeInvalidRect();
if (invalidRect) {
PostInvalidation(invalidRect->mInputSpaceRect,
Some(invalidRect->mOutputSpaceRect));
}
return result == WriteState::FINISHED
? Transition::To(State::FINISH, 0)
: Transition::To(State::ROW_OF_PIXELS, mBytesPerRow);
}
// set timeout and frame disposal method for the current frame
void
nsPNGDecoder::EndImageFrame()
{
if (mFrameIsHidden) {
return;
}
mNumFrames++;
Opacity opacity = Opacity::SOME_TRANSPARENCY;
if (format == gfx::SurfaceFormat::B8G8R8X8) {
opacity = Opacity::OPAQUE;
}
#ifdef PNG_APNG_SUPPORTED
uint32_t numFrames = GetFrameCount();
// We can't use mPNG->num_frames_read as it may be one ahead.
if (numFrames > 1) {
PostInvalidation(mFrameRect);
}
#endif
PostFrameStop(opacity, mAnimInfo.mDispose, mAnimInfo.mTimeout,
mAnimInfo.mBlend);
}
//******************************************************************************
nsresult nsGIFDecoder2::BeginImageFrame(uint16_t aDepth)
{
uint32_t imageDataLength;
nsresult rv;
gfxASurface::gfxImageFormat format;
if (mGIFStruct.is_transparent)
format = gfxASurface::ImageFormatARGB32;
else
format = gfxASurface::ImageFormatRGB24;
// Use correct format, RGB for first frame, PAL for following frames
// and include transparency to allow for optimization of opaque images
if (mGIFStruct.images_decoded) {
// Image data is stored with original depth and palette
rv = mImage.EnsureFrame(mGIFStruct.images_decoded,
mGIFStruct.x_offset, mGIFStruct.y_offset,
mGIFStruct.width, mGIFStruct.height,
format, aDepth, &mImageData, &imageDataLength,
&mColormap, &mColormapSize);
// While EnsureFrame can reuse frames, we unconditionally increment
// mGIFStruct.images_decoded when we're done with a frame, so we both can
// and need to zero out the colormap and image data after every call to
// EnsureFrame.
if (NS_SUCCEEDED(rv) && mColormap) {
memset(mColormap, 0, mColormapSize);
}
} else {
// Regardless of depth of input, image is decoded into 24bit RGB
rv = mImage.EnsureFrame(mGIFStruct.images_decoded,
mGIFStruct.x_offset, mGIFStruct.y_offset,
mGIFStruct.width, mGIFStruct.height,
format, &mImageData, &imageDataLength);
}
if (NS_FAILED(rv))
return rv;
memset(mImageData, 0, imageDataLength);
mImage.SetFrameDisposalMethod(mGIFStruct.images_decoded,
mGIFStruct.disposal_method);
// Tell the superclass we're starting a frame
PostFrameStart();
if (!mGIFStruct.images_decoded) {
// Send a onetime invalidation for the first frame if it has a y-axis offset.
// Otherwise, the area may never be refreshed and the placeholder will remain
// on the screen. (Bug 37589)
if (mGIFStruct.y_offset > 0) {
nsIntRect r(0, 0, mGIFStruct.screen_width, mGIFStruct.y_offset);
PostInvalidation(r);
}
}
mCurrentFrame = mGIFStruct.images_decoded;
return NS_OK;
}
//******************************************************************************
void nsGIFDecoder2::EndImageFrame()
{
// First flush all pending image data
if (!mGIFStruct.images_decoded) {
// Only need to flush first frame
FlushImageData();
// If the first frame is smaller in height than the entire image, send an
// invalidation for the area it does not have data for.
// This will clear the remaining bits of the placeholder. (Bug 37589)
const PRUint32 realFrameHeight = mGIFStruct.height + mGIFStruct.y_offset;
if (realFrameHeight < mGIFStruct.screen_height) {
nsIntRect r(0, realFrameHeight,
mGIFStruct.screen_width,
mGIFStruct.screen_height - realFrameHeight);
PostInvalidation(r);
}
// This transparency check is only valid for first frame
if (mGIFStruct.is_transparent && !mSawTransparency) {
mImage->SetFrameHasNoAlpha(mGIFStruct.images_decoded);
}
}
mCurrentRow = mLastFlushedRow = -1;
mCurrentPass = mLastFlushedPass = 0;
// Only add frame if we have any rows at all
if (mGIFStruct.rows_remaining != mGIFStruct.height) {
if (mGIFStruct.rows_remaining && mGIFStruct.images_decoded) {
// Clear the remaining rows (only needed for the animation frames)
PRUint8 *rowp = mImageData + ((mGIFStruct.height - mGIFStruct.rows_remaining) * mGIFStruct.width);
memset(rowp, 0, mGIFStruct.rows_remaining * mGIFStruct.width);
}
// We actually have the timeout information before we get the lzw encoded
// image data, at least according to the spec, but we delay in setting the
// timeout for the image until here to help ensure that we have the whole
// image frame decoded before we go off and try to display another frame.
mImage->SetFrameTimeout(mGIFStruct.images_decoded, mGIFStruct.delay_time);
}
// Unconditionally increment images_decoded, because we unconditionally
// append frames in BeginImageFrame(). This ensures that images_decoded
// always refers to the frame in mImage we're currently decoding,
// even if some of them weren't decoded properly and thus are blank.
mGIFStruct.images_decoded++;
// Tell the superclass we finished a frame
PostFrameStop();
// Reset the transparent pixel
if (mOldColor) {
mColormap[mGIFStruct.tpixel] = mOldColor;
mOldColor = 0;
}
mCurrentFrame = -1;
}
//******************************************************************************
void nsGIFDecoder2::EndImageFrame()
{
FrameBlender::FrameAlpha alpha = FrameBlender::kFrameHasAlpha;
// First flush all pending image data
if (!mGIFStruct.images_decoded) {
// Only need to flush first frame
FlushImageData();
// If the first frame is smaller in height than the entire image, send an
// invalidation for the area it does not have data for.
// This will clear the remaining bits of the placeholder. (Bug 37589)
const uint32_t realFrameHeight = mGIFStruct.height + mGIFStruct.y_offset;
if (realFrameHeight < mGIFStruct.screen_height) {
nsIntRect r(0, realFrameHeight,
mGIFStruct.screen_width,
mGIFStruct.screen_height - realFrameHeight);
PostInvalidation(r);
}
// This transparency check is only valid for first frame
if (mGIFStruct.is_transparent && !mSawTransparency) {
alpha = FrameBlender::kFrameOpaque;
}
}
mCurrentRow = mLastFlushedRow = -1;
mCurrentPass = mLastFlushedPass = 0;
// Only add frame if we have any rows at all
if (mGIFStruct.rows_remaining != mGIFStruct.height) {
if (mGIFStruct.rows_remaining && mGIFStruct.images_decoded) {
// Clear the remaining rows (only needed for the animation frames)
uint8_t *rowp = mImageData + ((mGIFStruct.height - mGIFStruct.rows_remaining) * mGIFStruct.width);
memset(rowp, 0, mGIFStruct.rows_remaining * mGIFStruct.width);
}
}
// Unconditionally increment images_decoded, because we unconditionally
// append frames in BeginImageFrame(). This ensures that images_decoded
// always refers to the frame in mImage we're currently decoding,
// even if some of them weren't decoded properly and thus are blank.
mGIFStruct.images_decoded++;
// Tell the superclass we finished a frame
PostFrameStop(alpha,
FrameBlender::FrameDisposalMethod(mGIFStruct.disposal_method),
mGIFStruct.delay_time);
// Reset the transparent pixel
if (mOldColor) {
mColormap[mGIFStruct.tpixel] = mOldColor;
mOldColor = 0;
}
mCurrentFrameIndex = -1;
}
//******************************************************************************
nsresult nsGIFDecoder2::BeginImageFrame(gfx_depth aDepth)
{
PRUint32 imageDataLength;
nsresult rv;
gfxASurface::gfxImageFormat format;
if (mGIFStruct.is_transparent)
format = gfxASurface::ImageFormatARGB32;
else
format = gfxASurface::ImageFormatRGB24;
// Use correct format, RGB for first frame, PAL for following frames
// and include transparency to allow for optimization of opaque images
if (mGIFStruct.images_decoded) {
// Image data is stored with original depth and palette
rv = mImage->AppendPalettedFrame(mGIFStruct.x_offset, mGIFStruct.y_offset,
mGIFStruct.width, mGIFStruct.height,
format, aDepth, &mImageData, &imageDataLength,
&mColormap, &mColormapSize);
} else {
// Regardless of depth of input, image is decoded into 24bit RGB
rv = mImage->AppendFrame(mGIFStruct.x_offset, mGIFStruct.y_offset,
mGIFStruct.width, mGIFStruct.height,
format, &mImageData, &imageDataLength);
}
if (NS_FAILED(rv))
return rv;
mImage->SetFrameDisposalMethod(mGIFStruct.images_decoded,
mGIFStruct.disposal_method);
// Tell the superclass we're starting a frame
PostFrameStart();
if (!mGIFStruct.images_decoded) {
// Send a onetime invalidation for the first frame if it has a y-axis offset.
// Otherwise, the area may never be refreshed and the placeholder will remain
// on the screen. (Bug 37589)
if (mGIFStruct.y_offset > 0) {
PRInt32 imgWidth;
mImage->GetWidth(&imgWidth);
nsIntRect r(0, 0, imgWidth, mGIFStruct.y_offset);
PostInvalidation(r);
}
}
mCurrentFrame = mGIFStruct.images_decoded;
return NS_OK;
}
// set timeout and frame disposal method for the current frame
void nsPNGDecoder::EndImageFrame()
{
if (mFrameIsHidden)
return;
PRUint32 numFrames = 1;
#ifdef PNG_APNG_SUPPORTED
numFrames = mImage->GetNumFrames();
// We can't use mPNG->num_frames_read as it may be one ahead.
if (numFrames > 1) {
// Tell the image renderer that the frame is complete
if (mFrameHasNoAlpha)
mImage->SetFrameHasNoAlpha(numFrames - 1);
PostInvalidation(mFrameRect);
}
#endif
PostFrameStop();
}
// set timeout and frame disposal method for the current frame
void nsPNGDecoder::EndImageFrame()
{
if (mFrameIsHidden)
return;
uint32_t numFrames = 1;
#ifdef PNG_APNG_SUPPORTED
numFrames = mImage.GetNumFrames();
// We can't use mPNG->num_frames_read as it may be one ahead.
if (numFrames > 1) {
// Tell the image renderer that the frame is complete
if (mFrameHasNoAlpha)
mImage.SetFrameHasNoAlpha(numFrames - 1);
// PNG is always non-premult
mImage.SetFrameAsNonPremult(numFrames - 1, true);
PostInvalidation(mFrameRect);
}
#endif
PostFrameStop();
}
// set timeout and frame disposal method for the current frame
void nsPNGDecoder::EndImageFrame()
{
if (mFrameIsHidden)
return;
mNumFrames++;
FrameBlender::FrameAlpha alpha;
if (mFrameHasNoAlpha)
alpha = FrameBlender::kFrameOpaque;
else
alpha = FrameBlender::kFrameHasAlpha;
#ifdef PNG_APNG_SUPPORTED
uint32_t numFrames = GetFrameCount();
// We can't use mPNG->num_frames_read as it may be one ahead.
if (numFrames > 1) {
PostInvalidation(mFrameRect);
}
#endif
PostFrameStop(alpha, mAnimInfo.mDispose, mAnimInfo.mTimeout, mAnimInfo.mBlend);
}
void
nsGIFDecoder2::WriteInternal(const char *aBuffer, uint32_t aCount, DecodeStrategy)
{
NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
// These variables changed names, and renaming would make a much bigger patch :(
const uint8_t *buf = (const uint8_t *)aBuffer;
uint32_t len = aCount;
const uint8_t *q = buf;
// Add what we have sofar to the block
// If previous call to me left something in the hold first complete current block
// Or if we are filling the colormaps, first complete the colormap
uint8_t* p = (mGIFStruct.state == gif_global_colormap) ? (uint8_t*)mGIFStruct.global_colormap :
(mGIFStruct.state == gif_image_colormap) ? (uint8_t*)mColormap :
(mGIFStruct.bytes_in_hold) ? mGIFStruct.hold : nullptr;
if (len == 0 && buf == nullptr) {
// We've just gotten the frame we asked for. Time to use the data we
// stashed away.
len = mGIFStruct.bytes_in_hold;
q = buf = p;
} else if (p) {
// Add what we have sofar to the block
uint32_t l = std::min(len, mGIFStruct.bytes_to_consume);
memcpy(p+mGIFStruct.bytes_in_hold, buf, l);
if (l < mGIFStruct.bytes_to_consume) {
// Not enough in 'buf' to complete current block, get more
mGIFStruct.bytes_in_hold += l;
mGIFStruct.bytes_to_consume -= l;
return;
}
// Point 'q' to complete block in hold (or in colormap)
q = p;
}
// Invariant:
// 'q' is start of current to be processed block (hold, colormap or buf)
// 'bytes_to_consume' is number of bytes to consume from 'buf'
// 'buf' points to the bytes to be consumed from the input buffer
// 'len' is number of bytes left in input buffer from position 'buf'.
// At entrance of the for loop will 'buf' will be moved 'bytes_to_consume'
// to point to next buffer, 'len' is adjusted accordingly.
// So that next round in for loop, q gets pointed to the next buffer.
for (;len >= mGIFStruct.bytes_to_consume; q=buf, mGIFStruct.bytes_in_hold = 0) {
// Eat the current block from the buffer, q keeps pointed at current block
buf += mGIFStruct.bytes_to_consume;
len -= mGIFStruct.bytes_to_consume;
switch (mGIFStruct.state)
{
case gif_lzw:
if (!DoLzw(q)) {
mGIFStruct.state = gif_error;
break;
}
GETN(1, gif_sub_block);
break;
case gif_lzw_start:
{
// Make sure the transparent pixel is transparent in the colormap
if (mGIFStruct.is_transparent) {
// Save old value so we can restore it later
if (mColormap == mGIFStruct.global_colormap)
mOldColor = mColormap[mGIFStruct.tpixel];
mColormap[mGIFStruct.tpixel] = 0;
}
/* Initialize LZW parser/decoder */
mGIFStruct.datasize = *q;
const int clear_code = ClearCode();
if (mGIFStruct.datasize > MAX_LZW_BITS ||
clear_code >= MAX_BITS) {
mGIFStruct.state = gif_error;
break;
}
mGIFStruct.avail = clear_code + 2;
mGIFStruct.oldcode = -1;
mGIFStruct.codesize = mGIFStruct.datasize + 1;
mGIFStruct.codemask = (1 << mGIFStruct.codesize) - 1;
mGIFStruct.datum = mGIFStruct.bits = 0;
/* init the tables */
for (int i = 0; i < clear_code; i++)
mGIFStruct.suffix[i] = i;
mGIFStruct.stackp = mGIFStruct.stack;
GETN(1, gif_sub_block);
}
break;
/* All GIF files begin with "GIF87a" or "GIF89a" */
case gif_type:
if (!strncmp((char*)q, "GIF89a", 6)) {
mGIFStruct.version = 89;
} else if (!strncmp((char*)q, "GIF87a", 6)) {
mGIFStruct.version = 87;
} else {
mGIFStruct.state = gif_error;
break;
}
GETN(7, gif_global_header);
break;
case gif_global_header:
/* This is the height and width of the "screen" or
* frame into which images are rendered. The
* individual images can be smaller than the
* screen size and located with an origin anywhere
* within the screen.
*/
mGIFStruct.screen_width = GETINT16(q);
mGIFStruct.screen_height = GETINT16(q + 2);
mGIFStruct.global_colormap_depth = (q[4]&0x07) + 1;
if (IsSizeDecode()) {
MOZ_ASSERT(!mGIFOpen, "Gif should not be open at this point");
PostSize(mGIFStruct.screen_width, mGIFStruct.screen_height);
return;
}
// screen_bgcolor is not used
//mGIFStruct.screen_bgcolor = q[5];
// q[6] = Pixel Aspect Ratio
// Not used
// float aspect = (float)((q[6] + 15) / 64.0);
if (q[4] & 0x80) { /* global map */
// Get the global colormap
const uint32_t size = (3 << mGIFStruct.global_colormap_depth);
if (len < size) {
// Use 'hold' pattern to get the global colormap
GETN(size, gif_global_colormap);
break;
}
// Copy everything, go to colormap state to do CMS correction
memcpy(mGIFStruct.global_colormap, buf, size);
buf += size;
len -= size;
GETN(0, gif_global_colormap);
break;
}
GETN(1, gif_image_start);
break;
case gif_global_colormap:
// Everything is already copied into global_colormap
// Convert into Cairo colors including CMS transformation
ConvertColormap(mGIFStruct.global_colormap, 1<<mGIFStruct.global_colormap_depth);
GETN(1, gif_image_start);
break;
case gif_image_start:
switch (*q) {
case GIF_TRAILER:
mGIFStruct.state = gif_done;
break;
case GIF_EXTENSION_INTRODUCER:
GETN(2, gif_extension);
break;
case GIF_IMAGE_SEPARATOR:
GETN(9, gif_image_header);
break;
default:
/* If we get anything other than GIF_IMAGE_SEPARATOR,
* GIF_EXTENSION_INTRODUCER, or GIF_TRAILER, there is extraneous data
* between blocks. The GIF87a spec tells us to keep reading
* until we find an image separator, but GIF89a says such
* a file is corrupt. We follow GIF89a and bail out. */
if (mGIFStruct.images_decoded > 0) {
/* The file is corrupt, but one or more images have
* been decoded correctly. In this case, we proceed
* as if the file were correctly terminated and set
* the state to gif_done, so the GIF will display.
*/
mGIFStruct.state = gif_done;
} else {
/* No images decoded, there is nothing to display. */
mGIFStruct.state = gif_error;
}
}
break;
case gif_extension:
mGIFStruct.bytes_to_consume = q[1];
if (mGIFStruct.bytes_to_consume) {
switch (*q) {
case GIF_GRAPHIC_CONTROL_LABEL:
// The GIF spec mandates that the GIFControlExtension header block length is 4 bytes,
// and the parser for this block reads 4 bytes, so we must enforce that the buffer
// contains at least this many bytes. If the GIF specifies a different length, we
// allow that, so long as it's larger; the additional data will simply be ignored.
mGIFStruct.state = gif_control_extension;
mGIFStruct.bytes_to_consume = std::max(mGIFStruct.bytes_to_consume, 4u);
break;
// The GIF spec also specifies the lengths of the following two extensions' headers
// (as 12 and 11 bytes, respectively). Because we ignore the plain text extension entirely
// and sanity-check the actual length of the application extension header before reading it,
// we allow GIFs to deviate from these values in either direction. This is important for
// real-world compatibility, as GIFs in the wild exist with application extension headers
// that are both shorter and longer than 11 bytes.
case GIF_APPLICATION_EXTENSION_LABEL:
mGIFStruct.state = gif_application_extension;
break;
case GIF_PLAIN_TEXT_LABEL:
mGIFStruct.state = gif_skip_block;
break;
case GIF_COMMENT_LABEL:
mGIFStruct.state = gif_consume_comment;
break;
default:
mGIFStruct.state = gif_skip_block;
}
} else {
GETN(1, gif_image_start);
}
break;
case gif_consume_block:
if (!*q)
GETN(1, gif_image_start);
else
GETN(*q, gif_skip_block);
break;
case gif_skip_block:
GETN(1, gif_consume_block);
break;
case gif_control_extension:
mGIFStruct.is_transparent = *q & 0x1;
mGIFStruct.tpixel = q[3];
mGIFStruct.disposal_method = ((*q) >> 2) & 0x7;
// Some specs say 3rd bit (value 4), other specs say value 3
// Let's choose 3 (the more popular)
if (mGIFStruct.disposal_method == 4)
mGIFStruct.disposal_method = 3;
mGIFStruct.delay_time = GETINT16(q + 1) * 10;
GETN(1, gif_consume_block);
break;
case gif_comment_extension:
if (*q)
GETN(*q, gif_consume_comment);
else
GETN(1, gif_image_start);
break;
case gif_consume_comment:
GETN(1, gif_comment_extension);
break;
case gif_application_extension:
/* Check for netscape application extension */
if (mGIFStruct.bytes_to_consume == 11 &&
(!strncmp((char*)q, "NETSCAPE2.0", 11) ||
!strncmp((char*)q, "ANIMEXTS1.0", 11)))
GETN(1, gif_netscape_extension_block);
else
GETN(1, gif_consume_block);
break;
/* Netscape-specific GIF extension: animation looping */
case gif_netscape_extension_block:
if (*q)
// We might need to consume 3 bytes in
// gif_consume_netscape_extension, so make sure we have at least that.
GETN(std::max(3, static_cast<int>(*q)), gif_consume_netscape_extension);
else
GETN(1, gif_image_start);
break;
/* Parse netscape-specific application extensions */
case gif_consume_netscape_extension:
switch (q[0] & 7) {
case 1:
/* Loop entire animation specified # of times. Only read the
loop count during the first iteration. */
mGIFStruct.loop_count = GETINT16(q + 1);
GETN(1, gif_netscape_extension_block);
break;
case 2:
/* Wait for specified # of bytes to enter buffer */
// Don't do this, this extension doesn't exist (isn't used at all)
// and doesn't do anything, as our streaming/buffering takes care of it all...
// See: http://semmix.pl/color/exgraf/eeg24.htm
GETN(1, gif_netscape_extension_block);
break;
default:
// 0,3-7 are yet to be defined netscape extension codes
mGIFStruct.state = gif_error;
}
break;
case gif_image_header:
{
/* Get image offsets, with respect to the screen origin */
mGIFStruct.x_offset = GETINT16(q);
mGIFStruct.y_offset = GETINT16(q + 2);
/* Get image width and height. */
mGIFStruct.width = GETINT16(q + 4);
mGIFStruct.height = GETINT16(q + 6);
if (!mGIFStruct.images_decoded) {
/* Work around broken GIF files where the logical screen
* size has weird width or height. We assume that GIF87a
* files don't contain animations.
*/
if ((mGIFStruct.screen_height < mGIFStruct.height) ||
(mGIFStruct.screen_width < mGIFStruct.width) ||
(mGIFStruct.version == 87)) {
mGIFStruct.screen_height = mGIFStruct.height;
mGIFStruct.screen_width = mGIFStruct.width;
mGIFStruct.x_offset = 0;
mGIFStruct.y_offset = 0;
}
// Create the image container with the right size.
BeginGIF();
if (HasError()) {
// Setting the size led to an error.
mGIFStruct.state = gif_error;
return;
}
// If we were doing a size decode, we're done
if (IsSizeDecode())
return;
}
/* Work around more broken GIF files that have zero image
width or height */
if (!mGIFStruct.height || !mGIFStruct.width) {
mGIFStruct.height = mGIFStruct.screen_height;
mGIFStruct.width = mGIFStruct.screen_width;
if (!mGIFStruct.height || !mGIFStruct.width) {
mGIFStruct.state = gif_error;
break;
}
}
/* Depth of colors is determined by colormap */
/* (q[8] & 0x80) indicates local colormap */
/* bits per pixel is (q[8]&0x07 + 1) when local colormap is set */
uint32_t depth = mGIFStruct.global_colormap_depth;
if (q[8] & 0x80)
depth = (q[8]&0x07) + 1;
uint32_t realDepth = depth;
while (mGIFStruct.tpixel >= (1 << realDepth) && (realDepth < 8)) {
realDepth++;
}
// Mask to limit the color values within the colormap
mColorMask = 0xFF >> (8 - realDepth);
BeginImageFrame(realDepth);
if (NeedsNewFrame()) {
// We now need a new frame from the decoder framework. We leave all our
// data in the buffer as if it wasn't consumed, copy to our hold and return
// to the decoder framework.
uint32_t size = len + mGIFStruct.bytes_to_consume + mGIFStruct.bytes_in_hold;
if (size) {
if (SetHold(q, mGIFStruct.bytes_to_consume + mGIFStruct.bytes_in_hold, buf, len)) {
// Back into the decoder infrastructure so we can get called again.
GETN(9, gif_image_header_continue);
return;
}
}
break;
} else {
// FALL THROUGH
}
}
case gif_image_header_continue:
{
// While decoders can reuse frames, we unconditionally increment
// mGIFStruct.images_decoded when we're done with a frame, so we both can
// and need to zero out the colormap and image data after every new frame.
memset(mImageData, 0, mImageDataLength);
if (mColormap) {
memset(mColormap, 0, mColormapSize);
}
if (!mGIFStruct.images_decoded) {
// Send a onetime invalidation for the first frame if it has a y-axis offset.
// Otherwise, the area may never be refreshed and the placeholder will remain
// on the screen. (Bug 37589)
if (mGIFStruct.y_offset > 0) {
nsIntRect r(0, 0, mGIFStruct.screen_width, mGIFStruct.y_offset);
PostInvalidation(r);
}
}
if (q[8] & 0x40) {
mGIFStruct.interlaced = true;
mGIFStruct.ipass = 1;
} else {
mGIFStruct.interlaced = false;
mGIFStruct.ipass = 0;
}
/* Only apply the Haeberli display hack on the first frame */
mGIFStruct.progressive_display = (mGIFStruct.images_decoded == 0);
/* Clear state from last image */
mGIFStruct.irow = 0;
mGIFStruct.rows_remaining = mGIFStruct.height;
mGIFStruct.rowp = mImageData;
/* Depth of colors is determined by colormap */
/* (q[8] & 0x80) indicates local colormap */
/* bits per pixel is (q[8]&0x07 + 1) when local colormap is set */
uint32_t depth = mGIFStruct.global_colormap_depth;
if (q[8] & 0x80)
depth = (q[8]&0x07) + 1;
uint32_t realDepth = depth;
while (mGIFStruct.tpixel >= (1 << realDepth) && (realDepth < 8)) {
realDepth++;
}
if (q[8] & 0x80) /* has a local colormap? */
{
mGIFStruct.local_colormap_size = 1 << depth;
if (!mGIFStruct.images_decoded) {
// First frame has local colormap, allocate space for it
// as the image frame doesn't have its own palette
mColormapSize = sizeof(uint32_t) << realDepth;
if (!mGIFStruct.local_colormap) {
mGIFStruct.local_colormap = (uint32_t*)moz_xmalloc(mColormapSize);
}
mColormap = mGIFStruct.local_colormap;
}
const uint32_t size = 3 << depth;
if (mColormapSize > size) {
// Clear the notfilled part of the colormap
memset(((uint8_t*)mColormap) + size, 0, mColormapSize - size);
}
if (len < size) {
// Use 'hold' pattern to get the image colormap
GETN(size, gif_image_colormap);
break;
}
// Copy everything, go to colormap state to do CMS correction
memcpy(mColormap, buf, size);
buf += size;
len -= size;
GETN(0, gif_image_colormap);
break;
} else {
/* Switch back to the global palette */
if (mGIFStruct.images_decoded) {
// Copy global colormap into the palette of current frame
memcpy(mColormap, mGIFStruct.global_colormap, mColormapSize);
} else {
mColormap = mGIFStruct.global_colormap;
}
}
GETN(1, gif_lzw_start);
}
break;
case gif_image_colormap:
// Everything is already copied into local_colormap
// Convert into Cairo colors including CMS transformation
ConvertColormap(mColormap, mGIFStruct.local_colormap_size);
GETN(1, gif_lzw_start);
break;
case gif_sub_block:
mGIFStruct.count = *q;
if (mGIFStruct.count) {
/* Still working on the same image: Process next LZW data block */
/* Make sure there are still rows left. If the GIF data */
/* is corrupt, we may not get an explicit terminator. */
if (!mGIFStruct.rows_remaining) {
#ifdef DONT_TOLERATE_BROKEN_GIFS
mGIFStruct.state = gif_error;
break;
#else
/* This is an illegal GIF, but we remain tolerant. */
GETN(1, gif_sub_block);
#endif
if (mGIFStruct.count == GIF_TRAILER) {
/* Found a terminator anyway, so consider the image done */
GETN(1, gif_done);
break;
}
}
GETN(mGIFStruct.count, gif_lzw);
} else {
/* See if there are any more images in this sequence. */
EndImageFrame();
GETN(1, gif_image_start);
}
break;
case gif_done:
MOZ_ASSERT(!IsSizeDecode(), "Size decodes shouldn't reach gif_done");
FinishInternal();
goto done;
case gif_error:
PostDataError();
return;
// We shouldn't ever get here.
default:
break;
}
}
// if an error state is set but no data remains, code flow reaches here
if (mGIFStruct.state == gif_error) {
PostDataError();
return;
}
// Copy the leftover into mGIFStruct.hold
if (len) {
// Add what we have sofar to the block
if (mGIFStruct.state != gif_global_colormap && mGIFStruct.state != gif_image_colormap) {
if (!SetHold(buf, len)) {
PostDataError();
return;
}
} else {
uint8_t* p = (mGIFStruct.state == gif_global_colormap) ? (uint8_t*)mGIFStruct.global_colormap :
(uint8_t*)mColormap;
memcpy(p, buf, len);
mGIFStruct.bytes_in_hold = len;
}
mGIFStruct.bytes_to_consume -= len;
}
// We want to flush before returning if we're on the first frame
done:
if (!mGIFStruct.images_decoded) {
FlushImageData();
mLastFlushedRow = mCurrentRow;
mLastFlushedPass = mCurrentPass;
}
return;
}
void
nsIconDecoder::WriteInternal(const char* aBuffer, uint32_t aCount,
DecodeStrategy)
{
NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
// We put this here to avoid errors about crossing initialization with case
// jumps on linux.
uint32_t bytesToRead = 0;
// Loop until the input data is gone
while (aCount > 0) {
switch (mState) {
case iconStateStart:
// Grab the width
mWidth = (uint8_t)*aBuffer;
// Book Keeping
aBuffer++;
aCount--;
mState = iconStateHaveHeight;
break;
case iconStateHaveHeight:
// Grab the Height
mHeight = (uint8_t)*aBuffer;
// Post our size to the superclass
PostSize(mWidth, mHeight);
PostHasTransparency();
if (HasError()) {
// Setting the size led to an error.
mState = iconStateFinished;
return;
}
// If We're doing a size decode, we're done
if (IsSizeDecode()) {
mState = iconStateFinished;
break;
}
if (!mImageData) {
PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
return;
}
// Book Keeping
aBuffer++;
aCount--;
mState = iconStateReadPixels;
break;
case iconStateReadPixels: {
// How many bytes are we reading?
bytesToRead = std::min(aCount, mImageDataLength - mPixBytesRead);
// Copy the bytes
memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);
// Performance isn't critical here, so our update rectangle is
// always the full icon
nsIntRect r(0, 0, mWidth, mHeight);
// Invalidate
PostInvalidation(r);
// Book Keeping
aBuffer += bytesToRead;
aCount -= bytesToRead;
mPixBytesRead += bytesToRead;
// If we've got all the pixel bytes, we're finished
if (mPixBytesRead == mImageDataLength) {
PostFrameStop();
PostDecodeDone();
mState = iconStateFinished;
}
break;
}
case iconStateFinished:
// Consume all excess data silently
aCount = 0;
break;
}
}
}
void
nsIconDecoder::WriteInternal(const char *aBuffer, PRUint32 aCount)
{
NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
// We put this here to avoid errors about crossing initialization with case
// jumps on linux.
PRUint32 bytesToRead = 0;
nsresult rv;
// Performance isn't critical here, so our update rectangle is
// always the full icon
nsIntRect r(0, 0, mWidth, mHeight);
// Loop until the input data is gone
while (aCount > 0) {
switch (mState) {
case iconStateStart:
// Grab the width
mWidth = (PRUint8)*aBuffer;
// Book Keeping
aBuffer++;
aCount--;
mState = iconStateHaveHeight;
break;
case iconStateHaveHeight:
// Grab the Height
mHeight = (PRUint8)*aBuffer;
// Post our size to the superclass
PostSize(mWidth, mHeight);
if (HasError()) {
// Setting the size led to an error.
mState = iconStateFinished;
return;
}
// If We're doing a size decode, we're done
if (IsSizeDecode()) {
mState = iconStateFinished;
break;
}
// Add the frame and signal
rv = mImage.EnsureFrame(0, 0, 0, mWidth, mHeight,
gfxASurface::ImageFormatARGB32,
&mImageData, &mPixBytesTotal);
if (NS_FAILED(rv)) {
PostDecoderError(rv);
return;
}
// Tell the superclass we're starting a frame
PostFrameStart();
// Book Keeping
aBuffer++;
aCount--;
mState = iconStateReadPixels;
break;
case iconStateReadPixels:
// How many bytes are we reading?
bytesToRead = NS_MIN(aCount, mPixBytesTotal - mPixBytesRead);
// Copy the bytes
memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);
// Invalidate
PostInvalidation(r);
// Book Keeping
aBuffer += bytesToRead;
aCount -= bytesToRead;
mPixBytesRead += bytesToRead;
// If we've got all the pixel bytes, we're finished
if (mPixBytesRead == mPixBytesTotal) {
PostFrameStop();
PostDecodeDone();
mState = iconStateFinished;
}
break;
case iconStateFinished:
// Consume all excess data silently
aCount = 0;
break;
}
}
}
//******************************************************************************
void
nsGIFDecoder2::EndImageFrame()
{
Opacity opacity = Opacity::SOME_TRANSPARENCY;
// First flush all pending image data
if (!mGIFStruct.images_decoded) {
// Only need to flush first frame
FlushImageData();
// If the first frame is smaller in height than the entire image, send an
// invalidation for the area it does not have data for.
// This will clear the remaining bits of the placeholder. (Bug 37589)
const uint32_t realFrameHeight = mGIFStruct.height + mGIFStruct.y_offset;
if (realFrameHeight < mGIFStruct.screen_height) {
nsIntRect r(0, realFrameHeight,
mGIFStruct.screen_width,
mGIFStruct.screen_height - realFrameHeight);
PostInvalidation(r);
}
// The first frame was preallocated with alpha; if it wasn't transparent, we
// should fix that. We can also mark it opaque unconditionally if we didn't
// actually see any transparent pixels - this test is only valid for the
// first frame.
if (!mGIFStruct.is_transparent || !mSawTransparency) {
opacity = Opacity::OPAQUE;
}
}
mCurrentRow = mLastFlushedRow = -1;
mCurrentPass = mLastFlushedPass = 0;
// Only add frame if we have any rows at all
if (mGIFStruct.rows_remaining != mGIFStruct.height) {
if (mGIFStruct.rows_remaining && mGIFStruct.images_decoded) {
// Clear the remaining rows (only needed for the animation frames)
uint8_t* rowp =
mImageData + ((mGIFStruct.height - mGIFStruct.rows_remaining) *
mGIFStruct.width);
memset(rowp, 0, mGIFStruct.rows_remaining * mGIFStruct.width);
}
}
// Unconditionally increment images_decoded, because we unconditionally
// append frames in BeginImageFrame(). This ensures that images_decoded
// always refers to the frame in mImage we're currently decoding,
// even if some of them weren't decoded properly and thus are blank.
mGIFStruct.images_decoded++;
// Tell the superclass we finished a frame
PostFrameStop(opacity,
DisposalMethod(mGIFStruct.disposal_method),
mGIFStruct.delay_time);
// Reset the transparent pixel
if (mOldColor) {
mColormap[mGIFStruct.tpixel] = mOldColor;
mOldColor = 0;
}
mCurrentFrameIndex = -1;
}
nsresult
nsIconDecoder::WriteInternal(const char *aBuffer, PRUint32 aCount)
{
nsresult rv;
// We put this here to avoid errors about crossing initialization with case
// jumps on linux.
PRUint32 bytesToRead = 0;
// Performance isn't critical here, so our update rectangle is
// always the full icon
nsIntRect r(0, 0, mWidth, mHeight);
// Loop until the input data is gone
while (aCount > 0) {
switch (mState) {
case iconStateStart:
// Grab the width
mWidth = (PRUint8)*aBuffer;
// Book Keeping
aBuffer++;
aCount--;
mState = iconStateHaveHeight;
break;
case iconStateHaveHeight:
// Grab the Height
mHeight = (PRUint8)*aBuffer;
// Post our size to the superclass
PostSize(mWidth, mHeight);
// If We're doing a size decode, we're done
if (IsSizeDecode()) {
mState = iconStateFinished;
break;
}
// Add the frame and signal
rv = mImage->AppendFrame(0, 0, mWidth, mHeight,
gfxASurface::ImageFormatARGB32,
&mImageData, &mPixBytesTotal);
if (NS_FAILED(rv)) {
mState = iconStateError;
return rv;
}
// Tell the superclass we're starting a frame
PostFrameStart();
// Book Keeping
aBuffer++;
aCount--;
mState = iconStateReadPixels;
break;
case iconStateReadPixels:
// How many bytes are we reading?
bytesToRead = PR_MIN(aCount, mPixBytesTotal - mPixBytesRead);
// Copy the bytes
memcpy(mImageData + mPixBytesRead, aBuffer, bytesToRead);
// Invalidate
PostInvalidation(r);
// Book Keeping
aBuffer += bytesToRead;
aCount -= bytesToRead;
mPixBytesRead += bytesToRead;
// If we've got all the pixel bytes, we're finished
if (mPixBytesRead == mPixBytesTotal) {
NotifyDone(/* aSuccess = */ PR_TRUE);
mState = iconStateFinished;
}
break;
case iconStateFinished:
// Consume all excess data silently
aCount = 0;
break;
case iconStateError:
return NS_IMAGELIB_ERROR_FAILURE;
break;
}
}
return NS_OK;
}
void
nsWEBPDecoder::WriteInternal(const char *aBuffer, uint32_t aCount)
{
MOZ_ASSERT(!HasError(), "Shouldn't call WriteInternal after error!");
const uint8_t* buf = (const uint8_t*)aBuffer;
VP8StatusCode rv = WebPIAppend(mDecoder, buf, aCount);
if (rv == VP8_STATUS_OUT_OF_MEMORY) {
PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
return;
} else if (rv == VP8_STATUS_INVALID_PARAM ||
rv == VP8_STATUS_BITSTREAM_ERROR) {
PostDataError();
return;
} else if (rv == VP8_STATUS_UNSUPPORTED_FEATURE ||
rv == VP8_STATUS_USER_ABORT) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
// Catch any remaining erroneous return value.
if (rv != VP8_STATUS_OK && rv != VP8_STATUS_SUSPENDED) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
int lastLineRead = -1;
int height = 0;
int width = 0;
int stride = 0;
mData = WebPIDecGetRGB(mDecoder, &lastLineRead, &width, &height, &stride);
// The only valid format for WebP decoding for both alpha and non-alpha
// images is BGRA, where Opaque images have an A of 255.
// Assume transparency for all images.
// XXX: This could be compositor-optimized by doing a one-time check for
// all-255 alpha pixels, but that might interfere with progressive
// decoding. Probably not worth it?
PostHasTransparency();
if (lastLineRead == -1 || !mData)
return;
if (width <= 0 || height <= 0) {
PostDataError();
return;
}
if (!HasSize())
PostSize(width, height);
if (IsSizeDecode())
return;
if (!mImageData) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
// Transfer from mData to mImageData
if (lastLineRead > mLastLine) {
for (int line = mLastLine; line < lastLineRead; line++) {
for (int pix = 0; pix < width; pix++) {
// RGBA -> BGRA
uint32_t DataOffset = 4 * (line * width + pix);
mImageData[DataOffset+0] = mData[DataOffset+2];
mImageData[DataOffset+1] = mData[DataOffset+1];
mImageData[DataOffset+2] = mData[DataOffset+0];
mImageData[DataOffset+3] = mData[DataOffset+3];
}
}
// Invalidate
nsIntRect r(0, mLastLine, width, lastLineRead);
PostInvalidation(r);
}
mLastLine = lastLineRead;
return;
}
void
nsJPEGDecoder::OutputScanlines(bool* suspend)
{
*suspend = false;
const uint32_t top = mInfo.output_scanline;
while ((mInfo.output_scanline < mInfo.output_height)) {
// Use the Cairo image buffer as scanline buffer
uint32_t* imageRow = ((uint32_t*)mImageData) +
(mInfo.output_scanline * mInfo.output_width);
if (mInfo.out_color_space == MOZ_JCS_EXT_NATIVE_ENDIAN_XRGB) {
// Special case: scanline will be directly converted into packed ARGB
if (jpeg_read_scanlines(&mInfo, (JSAMPARRAY)&imageRow, 1) != 1) {
*suspend = true; // suspend
break;
}
continue; // all done for this row!
}
JSAMPROW sampleRow = (JSAMPROW)imageRow;
if (mInfo.output_components == 3) {
// Put the pixels at end of row to enable in-place expansion
sampleRow += mInfo.output_width;
}
// Request one scanline. Returns 0 or 1 scanlines.
if (jpeg_read_scanlines(&mInfo, &sampleRow, 1) != 1) {
*suspend = true; // suspend
break;
}
if (mTransform) {
JSAMPROW source = sampleRow;
if (mInfo.out_color_space == JCS_GRAYSCALE) {
// Convert from the 1byte grey pixels at begin of row
// to the 3byte RGB byte pixels at 'end' of row
sampleRow += mInfo.output_width;
}
qcms_transform_data(mTransform, source, sampleRow, mInfo.output_width);
// Move 3byte RGB data to end of row
if (mInfo.out_color_space == JCS_CMYK) {
memmove(sampleRow + mInfo.output_width,
sampleRow,
3 * mInfo.output_width);
sampleRow += mInfo.output_width;
}
} else {
if (mInfo.out_color_space == JCS_CMYK) {
// Convert from CMYK to RGB
// We cannot convert directly to Cairo, as the CMSRGBTransform
// may wants to do a RGB transform...
// Would be better to have platform CMSenabled transformation
// from CMYK to (A)RGB...
cmyk_convert_rgb((JSAMPROW)imageRow, mInfo.output_width);
sampleRow += mInfo.output_width;
}
if (mCMSMode == eCMSMode_All) {
// No embedded ICC profile - treat as sRGB
qcms_transform* transform = gfxPlatform::GetCMSRGBTransform();
if (transform) {
qcms_transform_data(transform, sampleRow, sampleRow,
mInfo.output_width);
}
}
}
// counter for while() loops below
uint32_t idx = mInfo.output_width;
// copy as bytes until source pointer is 32-bit-aligned
for (; (NS_PTR_TO_UINT32(sampleRow) & 0x3) && idx; --idx) {
*imageRow++ = gfxPackedPixel(0xFF, sampleRow[0], sampleRow[1],
sampleRow[2]);
sampleRow += 3;
}
// copy pixels in blocks of 4
while (idx >= 4) {
GFX_BLOCK_RGB_TO_FRGB(sampleRow, imageRow);
idx -= 4;
sampleRow += 12;
imageRow += 4;
}
// copy remaining pixel(s)
while (idx--) {
// 32-bit read of final pixel will exceed buffer, so read bytes
*imageRow++ = gfxPackedPixel(0xFF, sampleRow[0], sampleRow[1],
sampleRow[2]);
sampleRow += 3;
}
}
if (top != mInfo.output_scanline) {
nsIntRect r(0, top, mInfo.output_width, mInfo.output_scanline-top);
PostInvalidation(r);
}
}
void
nsWEBPDecoder::WriteInternal(const char *aBuffer, uint32_t aCount, DecodeStrategy)
{
NS_ABORT_IF_FALSE(!HasError(), "Shouldn't call WriteInternal after error!");
const uint8_t* buf = (const uint8_t*)aBuffer;
VP8StatusCode rv = WebPIAppend(mDecoder, buf, aCount);
if (rv == VP8_STATUS_OUT_OF_MEMORY) {
PostDecoderError(NS_ERROR_OUT_OF_MEMORY);
return;
} else if (rv == VP8_STATUS_INVALID_PARAM ||
rv == VP8_STATUS_BITSTREAM_ERROR) {
PostDataError();
return;
} else if (rv == VP8_STATUS_UNSUPPORTED_FEATURE ||
rv == VP8_STATUS_USER_ABORT) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
// Catch any remaining erroneous return value.
if (rv != VP8_STATUS_OK && rv != VP8_STATUS_SUSPENDED) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
int lastLineRead = -1;
int height = 0;
int width = 0;
int stride = 0;
mData = WebPIDecGetRGB(mDecoder, &lastLineRead, &width, &height, &stride);
if (lastLineRead == -1 || !mData)
return;
if (width <= 0 || height <= 0) {
PostDataError();
return;
}
if (!HasSize())
PostSize(width, height);
if (IsSizeDecode())
return;
uint32_t imagelength;
// First incremental Image data chunk. Special handling required.
if (mLastLine == 0 && lastLineRead > 0) {
imgFrame* aFrame;
nsresult res = mImage.EnsureFrame(0, 0, 0, width, height,
gfxASurface::ImageFormatARGB32,
(uint8_t**)&mImageData, &imagelength, &aFrame);
if (NS_FAILED(res) || !mImageData) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
}
if (!mImageData) {
PostDecoderError(NS_ERROR_FAILURE);
return;
}
if (lastLineRead > mLastLine) {
for (int line = mLastLine; line < lastLineRead; line++) {
uint32_t *cptr32 = (uint32_t*)(mImageData + (line * width));
uint8_t *cptr8 = mData + (line * stride);
for (int pix = 0; pix < width; pix++, cptr8 += 4) {
// if((cptr8[3] != 0) && (cptr8[0] != 0) && (cptr8[1] != 0) && (cptr8[2] != 0))
*cptr32++ = gfxPackedPixel(cptr8[3], cptr8[0], cptr8[1], cptr8[2]);
}
}
// Invalidate
nsIntRect r(0, mLastLine, width, lastLineRead);
PostInvalidation(r);
}
mLastLine = lastLineRead;
return;
}