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RetroZilla/modules/libpr0n/decoders/gif/imgContainerGIF.cpp
Ryan Nematz 2f2ae146c0 first commit
2015-10-20 23:03:22 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <pavlov@netscape.com>
* Chris Saari <saari@netscape.com>
* Asko Tontti <atontti@cc.hut.fi>
* Arron Mogge <paper@animecity.nu>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "imgContainerGIF.h"
#include "nsIServiceManager.h"
#include "nsIImage.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsMemory.h"
NS_IMPL_ISUPPORTS2(imgContainerGIF, imgIContainer, nsITimerCallback)
//******************************************************************************
imgContainerGIF::imgContainerGIF()
: mObserver(nsnull)
, mSize(0,0)
, mFirstFrameRefreshArea()
, mCurrentDecodingFrameIndex(0)
, mCurrentAnimationFrameIndex(0)
, mLastCompositedFrameIndex(-1)
, mDoneDecoding(PR_FALSE)
, mAnimating(PR_FALSE)
, mAnimationMode(kNormalAnimMode)
, mLoopCount(-1)
{
/* member initializers and constructor code */
}
//******************************************************************************
imgContainerGIF::~imgContainerGIF()
{
if (mTimer)
mTimer->Cancel();
}
//******************************************************************************
/* void init (in PRInt32 aWidth, in PRInt32 aHeight,
in imgIContainerObserver aObserver); */
NS_IMETHODIMP imgContainerGIF::Init(PRInt32 aWidth, PRInt32 aHeight,
imgIContainerObserver *aObserver)
{
if (aWidth <= 0 || aHeight <= 0) {
NS_WARNING("error - negative image size\n");
return NS_ERROR_FAILURE;
}
mSize.SizeTo(aWidth, aHeight);
mObserver = do_GetWeakReference(aObserver);
return NS_OK;
}
//******************************************************************************
/* readonly attribute gfx_format preferredAlphaChannelFormat; */
NS_IMETHODIMP imgContainerGIF::GetPreferredAlphaChannelFormat(gfx_format *aFormat)
{
*aFormat = gfxIFormats::RGB_A1;
return NS_OK;
}
//******************************************************************************
/* readonly attribute PRInt32 width; */
NS_IMETHODIMP imgContainerGIF::GetWidth(PRInt32 *aWidth)
{
*aWidth = mSize.width;
return NS_OK;
}
//******************************************************************************
/* readonly attribute PRInt32 height; */
NS_IMETHODIMP imgContainerGIF::GetHeight(PRInt32 *aHeight)
{
*aHeight = mSize.height;
return NS_OK;
}
//******************************************************************************
/* readonly attribute gfxIImageFrame currentFrame; */
NS_IMETHODIMP imgContainerGIF::GetCurrentFrame(gfxIImageFrame * *aCurrentFrame)
{
if (!(*aCurrentFrame = inlinedGetCurrentFrame()))
return NS_ERROR_FAILURE;
NS_ADDREF(*aCurrentFrame);
return NS_OK;
}
//******************************************************************************
/* readonly attribute unsigned long numFrames; */
NS_IMETHODIMP imgContainerGIF::GetNumFrames(PRUint32 *aNumFrames)
{
*aNumFrames = mFrames.Count();
return NS_OK;
}
//******************************************************************************
/* gfxIImageFrame getFrameAt (in unsigned long index); */
NS_IMETHODIMP imgContainerGIF::GetFrameAt(PRUint32 index,
gfxIImageFrame **_retval)
{
NS_ENSURE_ARG(index < mFrames.Count());
if (!(*_retval = mFrames[index]))
return NS_ERROR_FAILURE;
NS_ADDREF(*_retval);
return NS_OK;
}
//******************************************************************************
/* void appendFrame (in gfxIImageFrame item); */
NS_IMETHODIMP imgContainerGIF::AppendFrame(gfxIImageFrame *item)
{
NS_ASSERTION(item, "imgContainerGIF::AppendFrame: item is null");
if (!item)
return NS_ERROR_NULL_POINTER;
PRInt32 numFrames = mFrames.Count();
if (numFrames == 0) {
// First Frame
// If we dispose of the first frame by clearing it, then the
// First Frame's refresh area is all of itself.
// RESTORE_PREVIOUS is invalid (assumed to be DISPOSE_CLEAR)
PRInt32 frameDisposalMethod;
item->GetFrameDisposalMethod(&frameDisposalMethod);
if (frameDisposalMethod == DISPOSE_CLEAR ||
frameDisposalMethod == DISPOSE_RESTORE_PREVIOUS)
item->GetRect(mFirstFrameRefreshArea);
} else {
// Calculate mFirstFrameRefreshArea
// Some gifs are huge but only have a small area that they animate
// We only need to refresh that small area when Frame 0 comes around again
nsIntRect itemRect;
item->GetRect(itemRect);
mFirstFrameRefreshArea.UnionRect(mFirstFrameRefreshArea, itemRect);
}
mFrames.AppendObject(item);
// If this is our second frame, start the animation.
// Must be called after AppendElement because StartAnimation checks for > 1
// frame
if (numFrames == 1)
StartAnimation();
return NS_OK;
}
//******************************************************************************
/* void removeFrame (in gfxIImageFrame item); */
NS_IMETHODIMP imgContainerGIF::RemoveFrame(gfxIImageFrame *item)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
//******************************************************************************
/* void endFrameDecode (in gfxIImageFrame item, in unsigned long timeout); */
NS_IMETHODIMP imgContainerGIF::EndFrameDecode(PRUint32 aFrameNum,
PRUint32 aTimeout)
{
// Assume there's another frame.
// aFrameNum is 1 based, mCurrentDecodingFrameIndex is 0 based.
mCurrentDecodingFrameIndex = aFrameNum;
return NS_OK;
}
//******************************************************************************
/* void decodingComplete (); */
NS_IMETHODIMP imgContainerGIF::DecodingComplete(void)
{
mDoneDecoding = PR_TRUE;
// If there's only 1 frame, optimize it.
// Optimizing animated gifs is not supported
if (mFrames.Count() == 1)
mFrames[0]->SetMutable(PR_FALSE);
return NS_OK;
}
/* void clear (); */
NS_IMETHODIMP imgContainerGIF::Clear()
{
mFrames.Clear();
return NS_OK;
}
//******************************************************************************
NS_IMETHODIMP imgContainerGIF::GetAnimationMode(PRUint16 *aAnimationMode)
{
if (!aAnimationMode)
return NS_ERROR_NULL_POINTER;
*aAnimationMode = mAnimationMode;
return NS_OK;
}
//******************************************************************************
NS_IMETHODIMP imgContainerGIF::SetAnimationMode(PRUint16 aAnimationMode)
{
NS_ASSERTION(aAnimationMode == imgIContainer::kNormalAnimMode ||
aAnimationMode == imgIContainer::kDontAnimMode ||
aAnimationMode == imgIContainer::kLoopOnceAnimMode,
"Wrong Animation Mode is being set!");
if (mAnimationMode == kNormalAnimMode &&
(aAnimationMode == kDontAnimMode ||
aAnimationMode == kLoopOnceAnimMode)) {
StopAnimation();
} else if (aAnimationMode == kNormalAnimMode &&
(mAnimationMode == kDontAnimMode ||
mAnimationMode == kLoopOnceAnimMode)) {
mAnimationMode = aAnimationMode;
StartAnimation();
return NS_OK;
}
mAnimationMode = aAnimationMode;
return NS_OK;
}
//******************************************************************************
/* void startAnimation () */
NS_IMETHODIMP imgContainerGIF::StartAnimation()
{
if (mAnimationMode == kDontAnimMode || mAnimating || mTimer)
return NS_OK;
if (mFrames.Count() > 1) {
PRInt32 timeout;
gfxIImageFrame *currentFrame = inlinedGetCurrentFrame();
if (currentFrame) {
currentFrame->GetTimeout(&timeout);
if (timeout <= 0) // -1 means display this frame forever
return NS_OK;
} else
timeout = 100; // XXX hack.. the timer notify code will do the right
// thing, so just get that started
mTimer = do_CreateInstance("@mozilla.org/timer;1");
if (!mTimer)
return NS_ERROR_OUT_OF_MEMORY;
// The only way mAnimating becomes true is if the mTimer is created
mAnimating = PR_TRUE;
mTimer->InitWithCallback(NS_STATIC_CAST(nsITimerCallback*, this),
timeout, nsITimer::TYPE_REPEATING_SLACK);
}
return NS_OK;
}
//******************************************************************************
/* void stopAnimation (); */
NS_IMETHODIMP imgContainerGIF::StopAnimation()
{
mAnimating = PR_FALSE;
if (!mTimer)
return NS_OK;
mTimer->Cancel();
mTimer = nsnull;
return NS_OK;
}
//******************************************************************************
/* void ResetAnimation (); */
NS_IMETHODIMP imgContainerGIF::ResetAnimation()
{
if (mCurrentAnimationFrameIndex == 0 || mAnimationMode == kDontAnimMode)
return NS_OK;
PRBool oldAnimating = mAnimating;
if (oldAnimating) {
nsresult rv = StopAnimation();
if (NS_FAILED(rv))
return rv;
}
mLastCompositedFrameIndex = -1;
mCurrentAnimationFrameIndex = 0;
// Update display
nsCOMPtr<imgIContainerObserver> observer(do_QueryReferent(mObserver));
if (observer)
observer->FrameChanged(this, mFrames[0], &mFirstFrameRefreshArea);
if (oldAnimating)
return StartAnimation();
else
return NS_OK;
}
//******************************************************************************
/* attribute long loopCount; */
NS_IMETHODIMP imgContainerGIF::GetLoopCount(PRInt32 *aLoopCount)
{
NS_ASSERTION(aLoopCount, "ptr is null");
*aLoopCount = mLoopCount;
return NS_OK;
}
NS_IMETHODIMP imgContainerGIF::SetLoopCount(PRInt32 aLoopCount)
{
// -1 infinite
// 0 no looping, one iteration
// 1 one loop, two iterations
// ...
mLoopCount = aLoopCount;
return NS_OK;
}
NS_IMETHODIMP imgContainerGIF::Notify(nsITimer *timer)
{
NS_ASSERTION(mTimer == timer,
"imgContainerGIF::Notify called with incorrect timer");
if (!mAnimating || !mTimer)
return NS_OK;
nsCOMPtr<imgIContainerObserver> observer(do_QueryReferent(mObserver));
if (!observer) {
// the imgRequest that owns us is dead, we should die now too.
StopAnimation();
return NS_OK;
}
PRInt32 numFrames = mFrames.Count();
if (!numFrames)
return NS_OK;
gfxIImageFrame *nextFrame = nsnull;
PRInt32 previousFrameIndex = mCurrentAnimationFrameIndex;
PRInt32 nextFrameIndex = mCurrentAnimationFrameIndex + 1;
PRInt32 timeout = 0;
// If we're done decoding the next frame, go ahead and display it now and
// reinit the timer with the next frame's delay time.
if (mDoneDecoding || (nextFrameIndex < mCurrentDecodingFrameIndex)) {
if (numFrames == nextFrameIndex) {
// End of Animation
// If animation mode is "loop once", it's time to stop animating
if (mAnimationMode == kLoopOnceAnimMode || mLoopCount == 0) {
StopAnimation();
return NS_OK;
} else {
// We may have used mCompositingFrame to build a frame, and then copied
// it back into mFrames[..]. If so, delete composite to save memory
if (mCompositingFrame && mLastCompositedFrameIndex == -1)
mCompositingFrame = nsnull;
}
nextFrameIndex = 0;
if (mLoopCount > 0)
mLoopCount--;
}
if (!(nextFrame = mFrames[nextFrameIndex])) {
// something wrong with the next frame, skip it
mCurrentAnimationFrameIndex = nextFrameIndex;
mTimer->SetDelay(100);
return NS_OK;
}
nextFrame->GetTimeout(&timeout);
} else if (nextFrameIndex == mCurrentDecodingFrameIndex) {
// Uh oh, the frame we want to show is currently being decoded (partial)
// Wait a bit and try again
mTimer->SetDelay(100);
return NS_OK;
} else { // (nextFrameIndex > mCurrentDecodingFrameIndex)
// We shouldn't get here. However, if we are requesting a frame
// that hasn't been decoded yet, go back to the last frame decoded
NS_WARNING("imgContainerGIF::Notify() Frame is passed decoded frame");
nextFrameIndex = mCurrentDecodingFrameIndex;
if (!(nextFrame = mFrames[nextFrameIndex])) {
// something wrong with the next frame, skip it
mCurrentAnimationFrameIndex = nextFrameIndex;
mTimer->SetDelay(100);
return NS_OK;
}
nextFrame->GetTimeout(&timeout);
}
if (timeout > 0)
mTimer->SetDelay(timeout);
else
StopAnimation();
nsIntRect dirtyRect;
gfxIImageFrame *frameToUse = nsnull;
if (nextFrameIndex == 0) {
frameToUse = nextFrame;
dirtyRect = mFirstFrameRefreshArea;
} else {
gfxIImageFrame *prevFrame = mFrames[previousFrameIndex];
if (!prevFrame)
return NS_OK;
// Change frame and announce it
if (NS_FAILED(DoComposite(&frameToUse, &dirtyRect, prevFrame,
nextFrame, nextFrameIndex))) {
// something went wrong, move on to next
NS_WARNING("imgContainerGIF: Composing Frame Failed\n");
mCurrentAnimationFrameIndex = nextFrameIndex;
return NS_OK;
}
}
// Set mCurrentAnimationFrameIndex at the last possible moment
mCurrentAnimationFrameIndex = nextFrameIndex;
// Refreshes the screen
observer->FrameChanged(this, frameToUse, &dirtyRect);
return NS_OK;
}
//******************************************************************************
// DoComposite gets called when the timer for animation get fired and we have to
// update the composited frame of the animation.
nsresult imgContainerGIF::DoComposite(gfxIImageFrame** aFrameToUse,
nsIntRect* aDirtyRect,
gfxIImageFrame* aPrevFrame,
gfxIImageFrame* aNextFrame,
PRInt32 aNextFrameIndex)
{
NS_ASSERTION(aDirtyRect, "imgContainerGIF::DoComposite aDirtyRect is null");
NS_ASSERTION(aPrevFrame, "imgContainerGIF::DoComposite aPrevFrame is null");
NS_ASSERTION(aNextFrame, "imgContainerGIF::DoComposite aNextFrame is null");
NS_ASSERTION(aFrameToUse, "imgContainerGIF::DoComposite aFrameToUse is null");
PRInt32 prevFrameDisposalMethod;
aPrevFrame->GetFrameDisposalMethod(&prevFrameDisposalMethod);
if (prevFrameDisposalMethod == DISPOSE_RESTORE_PREVIOUS &&
!mCompositingPrevFrame)
prevFrameDisposalMethod = DISPOSE_CLEAR;
// Optimization: Skip compositing if the previous frame wants to clear the
// whole image
if (prevFrameDisposalMethod == DISPOSE_CLEAR_ALL) {
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
*aFrameToUse = aNextFrame;
return NS_OK;
}
nsIntRect prevFrameRect;
aPrevFrame->GetRect(prevFrameRect);
PRBool isFullPrevFrame = (prevFrameRect.x == 0 && prevFrameRect.y == 0 &&
prevFrameRect.width == mSize.width &&
prevFrameRect.height == mSize.height);
// Optimization: Skip compositing if the previous frame is the same size as
// container and it's clearing itself
if (isFullPrevFrame && prevFrameDisposalMethod == DISPOSE_CLEAR) {
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
*aFrameToUse = aNextFrame;
return NS_OK;
}
PRInt32 nextFrameDisposalMethod;
nsIntRect nextFrameRect;
aNextFrame->GetFrameDisposalMethod(&nextFrameDisposalMethod);
aNextFrame->GetRect(nextFrameRect);
PRBool isFullNextFrame = (nextFrameRect.x == 0 && nextFrameRect.y == 0 &&
nextFrameRect.width == mSize.width &&
nextFrameRect.height == mSize.height);
PRBool nextFrameHasAlpha;
PRUint32 aBPR;
nextFrameHasAlpha = NS_SUCCEEDED(aNextFrame->GetAlphaBytesPerRow(&aBPR));
// Optimization: Skip compositing if this frame is the same size as the
// container and it's fully drawing over prev frame (no alpha)
if (isFullNextFrame &&
(nextFrameDisposalMethod != DISPOSE_RESTORE_PREVIOUS) &&
!nextFrameHasAlpha) {
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
*aFrameToUse = aNextFrame;
return NS_OK;
}
// Calculate area that needs updating
switch (prevFrameDisposalMethod) {
default:
case DISPOSE_NOT_SPECIFIED:
case DISPOSE_KEEP:
*aDirtyRect = nextFrameRect;
break;
case DISPOSE_CLEAR:
// Calc area that needs to be redrawn (the combination of previous and
// this frame)
// XXX - This could be done with multiple framechanged calls
// Having prevFrame way at the top of the image, and nextFrame
// way at the bottom, and both frames being small, we'd be
// telling framechanged to refresh the whole image when only two
// small areas are needed.
aDirtyRect->UnionRect(nextFrameRect, prevFrameRect);
break;
case DISPOSE_RESTORE_PREVIOUS:
aDirtyRect->SetRect(0, 0, mSize.width, mSize.height);
break;
}
// Optimization:
// Skip compositing if the last composited frame is this frame
// (Only one composited frame was made for this animation. Example:
// Only Frame 3 of a 10 frame GIF required us to build a composite frame
// On the second loop of the GIF, we do not need to rebuild the frame
// since it's still sitting in mCompositingFrame)
if (mLastCompositedFrameIndex == aNextFrameIndex) {
*aFrameToUse = mCompositingFrame;
return NS_OK;
}
PRBool needToBlankComposite = PR_FALSE;
// Create the Compositing Frame
if (!mCompositingFrame) {
nsresult rv;
mCompositingFrame = do_CreateInstance("@mozilla.org/gfx/image/frame;2", &rv);
if (NS_FAILED(rv))
return rv;
rv = mCompositingFrame->Init(0, 0, mSize.width, mSize.height,
gfxIFormats::RGB_A1, 24);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to init mCompositingFrame!\n");
mCompositingFrame = nsnull;
return rv;
}
needToBlankComposite = PR_TRUE;
}
// Copy previous frame into mCompositingFrame before we put the new frame on top
// Assumes that the previous frame represents a full frame (it could be
// smaller in size than the container, as long as the frame before it erased
// itself)
// Note: Frame 1 never gets into DoComposite(), so (aNextFrameIndex - 1) will
// always be a valid frame number.
if (mLastCompositedFrameIndex != aNextFrameIndex - 1 &&
prevFrameDisposalMethod != DISPOSE_RESTORE_PREVIOUS) {
// XXX If we had a method of drawing a section of a frame into another, we
// could optimize further:
// if aPrevFrameIndex == 1 && mLastCompositedFrameIndex <> -1,
// only mFirstFrameRefreshArea needs to be drawn back to composite
if (isFullPrevFrame) {
CopyFrameImage(aPrevFrame, mCompositingFrame);
} else {
BlackenFrame(mCompositingFrame);
SetMaskVisibility(mCompositingFrame, PR_FALSE);
aPrevFrame->DrawTo(mCompositingFrame, prevFrameRect.x, prevFrameRect.y,
prevFrameRect.width, prevFrameRect.height);
BuildCompositeMask(mCompositingFrame, aPrevFrame);
needToBlankComposite = PR_FALSE;
}
}
// Dispose of previous
switch (prevFrameDisposalMethod) {
case DISPOSE_CLEAR:
if (needToBlankComposite) {
// If we just created the composite, it could have anything in it's
// buffers. Clear them
BlackenFrame(mCompositingFrame);
SetMaskVisibility(mCompositingFrame, PR_FALSE);
needToBlankComposite = PR_FALSE;
} else {
// Blank out previous frame area (both color & Mask/Alpha)
BlackenFrame(mCompositingFrame, prevFrameRect);
SetMaskVisibility(mCompositingFrame, prevFrameRect, PR_FALSE);
}
break;
case DISPOSE_RESTORE_PREVIOUS:
// It would be better to copy only the area changed back to
// mCompositingFrame.
if (mCompositingPrevFrame) {
CopyFrameImage(mCompositingPrevFrame, mCompositingFrame);
// destroy only if we don't need it for this frame's disposal
if (nextFrameDisposalMethod != DISPOSE_RESTORE_PREVIOUS)
mCompositingPrevFrame = nsnull;
} else {
BlackenFrame(mCompositingFrame);
SetMaskVisibility(mCompositingFrame, PR_FALSE);
}
break;
}
// Check if the frame we are composing wants the previous image restored afer
// it is done. Don't store it (again) if last frame wanted it's image restored
// too
if ((nextFrameDisposalMethod == DISPOSE_RESTORE_PREVIOUS) &&
(prevFrameDisposalMethod != DISPOSE_RESTORE_PREVIOUS)) {
// We are storing the whole image.
// It would be better if we just stored the area that nextFrame is going to
// overwrite.
if (!mCompositingPrevFrame) {
nsresult rv;
mCompositingPrevFrame = do_CreateInstance("@mozilla.org/gfx/image/frame;2",
&rv);
if (NS_FAILED(rv))
return rv;
rv = mCompositingPrevFrame->Init(0, 0, mSize.width, mSize.height,
gfxIFormats::RGB_A1, 24);
if (NS_FAILED(rv))
return rv;
}
CopyFrameImage(mCompositingFrame, mCompositingPrevFrame);
}
// blit next frame into it's correct spot
aNextFrame->DrawTo(mCompositingFrame, nextFrameRect.x, nextFrameRect.y,
nextFrameRect.width, nextFrameRect.height);
// put the mask in
BuildCompositeMask(mCompositingFrame, aNextFrame);
// Set timeout of CompositeFrame to timeout of frame we just composed
// Bug 177948
PRInt32 timeout;
aNextFrame->GetTimeout(&timeout);
mCompositingFrame->SetTimeout(timeout);
if (isFullNextFrame && mAnimationMode == kNormalAnimMode && mLoopCount != 0) {
// We have a composited full frame
// Store the composited frame into the mFrames[..] so we don't have to
// continuously re-build it
// Then set the previous frame's disposal to CLEAR_ALL so we just draw the
// frame next time around
if (CopyFrameImage(mCompositingFrame, aNextFrame)) {
aPrevFrame->SetFrameDisposalMethod(DISPOSE_CLEAR_ALL);
mLastCompositedFrameIndex = -1;
*aFrameToUse = aNextFrame;
return NS_OK;
}
}
mLastCompositedFrameIndex = aNextFrameIndex;
*aFrameToUse = mCompositingFrame;
return NS_OK;
}
//******************************************************************************
void imgContainerGIF::BuildCompositeMask(gfxIImageFrame *aCompositingFrame,
gfxIImageFrame *aOverlayFrame)
{
if (!aCompositingFrame || !aOverlayFrame) return;
nsresult res;
PRUint8* compositingAlphaData;
PRUint32 compositingAlphaDataLength;
aCompositingFrame->LockAlphaData();
res = aCompositingFrame->GetAlphaData(&compositingAlphaData,
&compositingAlphaDataLength);
if (!compositingAlphaData || !compositingAlphaDataLength || NS_FAILED(res)) {
aCompositingFrame->UnlockAlphaData();
return;
}
PRInt32 widthOverlay, heightOverlay;
PRInt32 overlayXOffset, overlayYOffset;
aOverlayFrame->GetWidth(&widthOverlay);
aOverlayFrame->GetHeight(&heightOverlay);
aOverlayFrame->GetX(&overlayXOffset);
aOverlayFrame->GetY(&overlayYOffset);
if (NS_FAILED(aOverlayFrame->LockAlphaData())) {
// set the region of the overlay frame to visible in compositingFrame
SetMaskVisibility(aCompositingFrame, overlayXOffset, overlayYOffset,
widthOverlay, heightOverlay, PR_TRUE);
aCompositingFrame->UnlockAlphaData();
return;
}
PRUint32 abprComposite;
aCompositingFrame->GetAlphaBytesPerRow(&abprComposite);
PRUint32 abprOverlay;
aOverlayFrame->GetAlphaBytesPerRow(&abprOverlay);
// Only the composite's width & height are needed. x & y should always be 0.
PRInt32 widthComposite, heightComposite;
aCompositingFrame->GetWidth(&widthComposite);
aCompositingFrame->GetHeight(&heightComposite);
PRUint8* overlayAlphaData;
PRUint32 overlayAlphaDataLength;
res = aOverlayFrame->GetAlphaData(&overlayAlphaData, &overlayAlphaDataLength);
gfx_format format;
aCompositingFrame->GetFormat(&format);
if (format != gfxIFormats::RGB_A1 && format != gfxIFormats::BGR_A1) {
NS_NOTREACHED("GIFs only support 1 bit alpha");
aCompositingFrame->UnlockAlphaData();
aOverlayFrame->UnlockAlphaData();
return;
}
// Exit if overlay is beyond the area of the composite
if (widthComposite <= overlayXOffset || heightComposite <= overlayYOffset)
return;
const PRUint32 width = PR_MIN(widthOverlay,
widthComposite - overlayXOffset);
const PRUint32 height = PR_MIN(heightOverlay,
heightComposite - overlayYOffset);
#ifdef MOZ_PLATFORM_IMAGES_BOTTOM_TO_TOP
// Account for bottom-up storage
PRInt32 offset = ((heightComposite - 1) - overlayYOffset) * abprComposite;
#else
PRInt32 offset = overlayYOffset * abprComposite;
#endif
PRUint8* alphaLine = compositingAlphaData + offset + (overlayXOffset >> 3);
#ifdef MOZ_PLATFORM_IMAGES_BOTTOM_TO_TOP
offset = (heightOverlay - 1) * abprOverlay;
#else
offset = 0;
#endif
PRUint8* overlayLine = overlayAlphaData + offset;
/*
This is the number of pixels of offset between alpha and overlay
(the number of bits at the front of alpha to skip when starting a row).
I.e:, for a mask_offset of 3:
(these are representations of bits)
overlay 'pixels': 76543210 hgfedcba
alpha: xxx76543 210hgfed ...
where 'x' is data already in alpha
the first 5 pixels of overlay are or'd into the low 5 bits of alpha
*/
PRUint8 mask_offset = (overlayXOffset & 0x7);
for(PRUint32 i = 0; i < height; i++) {
PRUint8 pixels;
PRUint32 j;
// use locals to avoid keeping track of how much we need to add
// at the end of a line. we don't really need this since we may
// be able to calculate the ending offsets, but it's simpler and
// cheap.
PRUint8 *localOverlay = overlayLine;
PRUint8 *localAlpha = alphaLine;
for (j = width; j >= 8; j -= 8) {
// don't do in for(...) to avoid reference past end of buffer
pixels = *localOverlay++;
if (pixels == 0) // no bits to set - iterate and bump output pointer
localAlpha++;
else {
// for the last few bits of a line, we need to special-case it
if (mask_offset == 0) // simple case, no offset
*localAlpha++ |= pixels;
else {
*localAlpha++ |= (pixels >> mask_offset);
*localAlpha |= (pixels << (8U-mask_offset));
}
}
}
if (j != 0) {
// handle the end of the line, 1 to 7 pixels
pixels = *localOverlay++;
if (pixels != 0) {
// last few bits have to be handled more carefully if
// width is not a multiple of 8.
// set bits we don't want to change to 0
pixels = (pixels >> (8U-j)) << (8U-j);
*localAlpha++ |= (pixels >> mask_offset);
// don't touch this byte unless we have bits for it
if (j > (8U - mask_offset))
*localAlpha |= (pixels << (8U-mask_offset));
}
}
#ifdef MOZ_PLATFORM_IMAGES_BOTTOM_TO_TOP
alphaLine -= abprComposite;
overlayLine -= abprOverlay;
#else
alphaLine += abprComposite;
overlayLine += abprOverlay;
#endif
}
aCompositingFrame->UnlockAlphaData();
aOverlayFrame->UnlockAlphaData();
return;
}
//******************************************************************************
void imgContainerGIF::SetMaskVisibility(gfxIImageFrame *aFrame,
PRInt32 aX, PRInt32 aY,
PRInt32 aWidth, PRInt32 aHeight,
PRBool aVisible)
{
if (!aFrame)
return;
nsresult res;
PRUint8* alphaData;
PRUint32 alphaDataLength;
aFrame->LockAlphaData();
res = aFrame->GetAlphaData(&alphaData, &alphaDataLength);
if (!alphaData || !alphaDataLength || NS_FAILED(res)) {
aFrame->UnlockAlphaData();
return;
}
PRInt32 frameWidth;
PRInt32 frameHeight;
aFrame->GetWidth(&frameWidth);
aFrame->GetHeight(&frameHeight);
const PRInt32 width = PR_MIN(aWidth, frameWidth - aX);
const PRInt32 height = PR_MIN(aHeight, frameHeight - aY);
if (width <= 0 || height <= 0) {
aFrame->UnlockAlphaData();
return;
}
gfx_format format;
aFrame->GetFormat(&format);
if (format != gfxIFormats::RGB_A1 && format != gfxIFormats::BGR_A1) {
NS_NOTREACHED("GIFs only support 1 bit alpha");
aFrame->UnlockAlphaData();
return;
}
PRUint32 abpr;
aFrame->GetAlphaBytesPerRow(&abpr);
#ifdef MOZ_PLATFORM_IMAGES_BOTTOM_TO_TOP
// Account for bottom-up storage.
// Start at the bottom (top in memory), go to the top (bottom in memory)
PRUint8* alphaLine = alphaData + ((frameHeight - aY - height) * abpr) +
(aX >> 3);
#else
PRUint8* alphaLine = alphaData + (aY * abpr) + (aX >> 3);
#endif
PRUint8 maskShiftStartBy = aX & 0x7;
PRUint8 numReplacingStart = 8U - maskShiftStartBy;
PRUint32 rowBytes;
PRUint8 maskStart = 0; // Init to shutup compiler; Only used if
// maskShiftStartBy != 0
PRUint8 maskEnd;
if (width <= numReplacingStart) {
maskEnd = (0xFF >> (8U - width)) << (numReplacingStart - width);
// Don't write start bits, only end bits (which contain both start & end)
maskShiftStartBy = 0;
rowBytes = 0;
} else {
if (maskShiftStartBy == 0)
numReplacingStart = 0;
else
maskStart = 0xFF >> maskShiftStartBy;
PRUint8 maskShiftEndBy = (width - numReplacingStart) & 0x7;
maskEnd = ~(0xFF >> maskShiftEndBy);
rowBytes = (width - numReplacingStart - maskShiftEndBy) >> 3;
}
if (aVisible) {
for (PRInt32 i = 0; i < height; i++) {
PRUint8 *localAlpha = alphaLine;
if (maskShiftStartBy != 0)
*localAlpha++ |= maskStart;
if (rowBytes > 0)
memset(localAlpha, 0xFF, rowBytes);
if (maskEnd != 0)
localAlpha[rowBytes] |= maskEnd;
alphaLine += abpr;
}
} else {
for (PRInt32 i = 0; i < height; i++) {
PRUint8 *localAlpha = alphaLine;
if (maskShiftStartBy != 0)
*localAlpha++ &= ~maskStart;
if (rowBytes > 0)
memset(localAlpha, 0x00, rowBytes);
if (maskEnd != 0)
localAlpha[rowBytes] &= ~maskEnd;
alphaLine += abpr;
} // for
} // if aVisible
aFrame->UnlockAlphaData();
return;
}
//******************************************************************************
void imgContainerGIF::SetMaskVisibility(gfxIImageFrame *aFrame, PRBool aVisible)
{
if (!aFrame)
return;
PRUint8* alphaData;
PRUint32 alphaDataLength;
const PRUint8 setMaskTo = aVisible ? 0xFF : 0x00;
aFrame->LockAlphaData();
nsresult res = aFrame->GetAlphaData(&alphaData, &alphaDataLength);
if (NS_SUCCEEDED(res) && alphaData && alphaDataLength)
memset(alphaData, setMaskTo, alphaDataLength);
aFrame->UnlockAlphaData();
return;
}
//******************************************************************************
// Fill aFrame with black. Does not change the mask.
void imgContainerGIF::BlackenFrame(gfxIImageFrame *aFrame)
{
if (!aFrame)
return;
aFrame->LockImageData();
PRUint8* aData;
PRUint32 aDataLength;
aFrame->GetImageData(&aData, &aDataLength);
memset(aData, 0, aDataLength);
nsCOMPtr<nsIInterfaceRequestor> ireq(do_QueryInterface(aFrame));
if (ireq) {
PRInt32 width;
PRInt32 height;
aFrame->GetWidth(&width);
aFrame->GetHeight(&height);
nsCOMPtr<nsIImage> img(do_GetInterface(ireq));
nsIntRect r(0, 0, width, height);
img->ImageUpdated(nsnull, nsImageUpdateFlags_kBitsChanged, &r);
}
aFrame->UnlockImageData();
}
//******************************************************************************
void imgContainerGIF::BlackenFrame(gfxIImageFrame *aFrame,
PRInt32 aX, PRInt32 aY,
PRInt32 aWidth, PRInt32 aHeight)
{
if (!aFrame)
return;
aFrame->LockImageData();
PRInt32 widthFrame;
PRInt32 heightFrame;
aFrame->GetWidth(&widthFrame);
aFrame->GetHeight(&heightFrame);
const PRInt32 width = PR_MIN(aWidth, (widthFrame - aX));
const PRInt32 height = PR_MIN(aHeight, (heightFrame - aY));
if (width <= 0 || height <= 0) {
aFrame->UnlockImageData();
return;
}
PRUint32 bpr; // Bytes Per Row
aFrame->GetImageBytesPerRow(&bpr);
#if defined(XP_MAC) || defined(XP_MACOSX)
const PRUint8 bpp = 4;
#else
const PRUint8 bpp = 3;
#endif
const PRUint32 bprToWrite = width * bpp;
const PRUint32 xOffset = aX * bpp; // offset into row to start writing
PRUint8* tmpRow = NS_STATIC_CAST(PRUint8*, nsMemory::Alloc(bprToWrite));
if (!tmpRow) {
aFrame->UnlockImageData();
return;
}
memset(tmpRow, 0, bprToWrite);
for (PRInt32 y = 0; y < height; y++) {
aFrame->SetImageData(tmpRow, bprToWrite, ((y + aY) * bpr) + xOffset);
}
nsMemory::Free(tmpRow);
aFrame->UnlockImageData();
}
//******************************************************************************
// Whether we succeed or fail will not cause a crash, and there's not much
// we can do about a failure, so there we don't return a nsresult
PRBool imgContainerGIF::CopyFrameImage(gfxIImageFrame *aSrcFrame,
gfxIImageFrame *aDstFrame)
{
PRUint8* aDataSrc;
PRUint8* aDataDest;
PRUint32 aDataLengthSrc;
PRUint32 aDataLengthDest;
if (!aSrcFrame || !aDstFrame)
return PR_FALSE;
if (NS_FAILED(aDstFrame->LockImageData()))
return PR_FALSE;
// Copy Image Over
aSrcFrame->GetImageData(&aDataSrc, &aDataLengthSrc);
aDstFrame->GetImageData(&aDataDest, &aDataLengthDest);
if (!aDataDest || !aDataSrc || aDataLengthDest != aDataLengthSrc) {
aDstFrame->UnlockImageData();
return PR_FALSE;
}
memcpy(aDataDest, aDataSrc, aDataLengthSrc);
aDstFrame->UnlockImageData();
// Copy Alpha/Mask Over
// If no mask, lockAlpha will tell us
if (NS_SUCCEEDED(aDstFrame->LockAlphaData())) {
aSrcFrame->GetAlphaData(&aDataSrc, &aDataLengthSrc);
aDstFrame->GetAlphaData(&aDataDest, &aDataLengthDest);
if (aDataDest && aDataSrc && aDataLengthDest == aDataLengthSrc)
memcpy(aDataDest, aDataSrc, aDataLengthSrc);
else
memset(aDataDest, 0xFF, aDataLengthDest);
aDstFrame->UnlockAlphaData();
}
// Tell the image that it's data has been updated
nsCOMPtr<nsIInterfaceRequestor> ireq(do_QueryInterface(aDstFrame));
if (!ireq)
return PR_FALSE;
nsCOMPtr<nsIImage> img(do_GetInterface(ireq));
if (!img)
return PR_FALSE;
nsIntRect r;
aDstFrame->GetRect(r);
img->ImageUpdated(nsnull, nsImageUpdateFlags_kBitsChanged, &r);
return PR_TRUE;
}
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