void
nsGIFDecoder2::FlushImageData()
{
switch (mCurrentPass - mLastFlushedPass) {
case 0: // same pass
if (mCurrentRow - mLastFlushedRow)
FlushImageData(mLastFlushedRow + 1, mCurrentRow - mLastFlushedRow);
break;
case 1: // one pass on - need to handle bottom & top rects
FlushImageData(0, mCurrentRow + 1);
FlushImageData(mLastFlushedRow + 1, mGIFStruct.height - (mLastFlushedRow + 1));
break;
default: // more than one pass on - push the whole frame
FlushImageData(0, mGIFStruct.height);
}
}
//******************************************************************************
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::FlushImageData()
{
nsresult rv = NS_OK;
switch (mCurrentPass - mLastFlushedPass) {
case 0: // same pass
if (mCurrentRow - mLastFlushedRow)
rv = FlushImageData(mLastFlushedRow + 1, mCurrentRow - mLastFlushedRow);
break;
case 1: // one pass on - need to handle bottom & top rects
rv = FlushImageData(0, mCurrentRow + 1);
rv |= FlushImageData(mLastFlushedRow + 1, mGIFStruct.height - (mLastFlushedRow + 1));
break;
default: // more than one pass on - push the whole frame
rv = FlushImageData(0, mGIFStruct.height);
}
return rv;
}
/* void write (in string aBuffer, in PRUint32 aCount); */
NS_IMETHODIMP
nsGIFDecoder2::Write(const char *aBuffer, PRUint32 aCount)
{
// Don't forgive previously flagged errors
if (mError)
return NS_ERROR_FAILURE;
// Push the data to the GIF decoder
nsresult rv = GifWrite((const unsigned char *)aBuffer, aCount);
// Flushing is only needed for first frame
if (NS_SUCCEEDED(rv) && !mGIFStruct.images_decoded) {
rv = FlushImageData();
NS_ENSURE_SUCCESS(rv, rv);
mLastFlushedRow = mCurrentRow;
mLastFlushedPass = mCurrentPass;
}
// We do some fine-grained error control here. If we have at least one frame
// of an animated gif, we still want to display it (mostly for legacy reasons).
// libpr0n code is strict, so we have to lie and tell it we were successful. So
// if we have something to salvage, we send off final decode notifications, and
// pretend that we're decoded. Otherwise, we set mError.
if (NS_FAILED(rv)) {
// Determine if we want to salvage the situation
PRUint32 numFrames = 0;
if (mImageContainer)
mImageContainer->GetNumFrames(&numFrames);
// If we're salvaging, send off notifications
// Note that we need to make sure that we have 2 frames, since that tells us
// that the first frame is complete (the second could be in any state).
if (numFrames > 1) {
EndGIF(/* aSuccess = */ PR_TRUE);
}
// Otherwise, set mError
else
mError = PR_TRUE;
}
return mError ? NS_ERROR_FAILURE : NS_OK;
}
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
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;
}
