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363 lines
13 KiB
363 lines
13 KiB
4 months ago
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/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <string.h>
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#include "JNIHelpers.h"
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#include "utils/log.h"
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#include "utils/math.h"
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#include "FrameSequence_gif.h"
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#define GIF_DEBUG 0
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static int streamReader(GifFileType* fileType, GifByteType* out, int size) {
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Stream* stream = (Stream*) fileType->UserData;
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return (int) stream->read(out, size);
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}
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static Color8888 gifColorToColor8888(const GifColorType& color) {
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return ARGB_TO_COLOR8888(0xff, color.Red, color.Green, color.Blue);
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}
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static long getDelayMs(GraphicsControlBlock& gcb) {
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return gcb.DelayTime * 10;
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}
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static bool willBeCleared(const GraphicsControlBlock& gcb) {
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return gcb.DisposalMode == DISPOSE_BACKGROUND || gcb.DisposalMode == DISPOSE_PREVIOUS;
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}
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////////////////////////////////////////////////////////////////////////////////
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// Frame sequence
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////////////////////////////////////////////////////////////////////////////////
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FrameSequence_gif::FrameSequence_gif(Stream* stream) :
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mLoopCount(1), mBgColor(TRANSPARENT), mPreservedFrames(NULL), mRestoringFrames(NULL) {
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mGif = DGifOpen(stream, streamReader, NULL);
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if (!mGif) {
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ALOGW("Gif load failed");
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return;
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}
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if (DGifSlurp(mGif) != GIF_OK) {
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ALOGW("Gif slurp failed");
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DGifCloseFile(mGif, NULL);
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mGif = NULL;
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return;
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}
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long durationMs = 0;
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int lastUnclearedFrame = -1;
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mPreservedFrames = new bool[mGif->ImageCount];
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mRestoringFrames = new int[mGif->ImageCount];
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GraphicsControlBlock gcb;
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for (int i = 0; i < mGif->ImageCount; i++) {
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const SavedImage& image = mGif->SavedImages[i];
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// find the loop extension pair
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for (int j = 0; (j + 1) < image.ExtensionBlockCount; j++) {
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ExtensionBlock* eb1 = image.ExtensionBlocks + j;
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ExtensionBlock* eb2 = image.ExtensionBlocks + j + 1;
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if (eb1->Function == APPLICATION_EXT_FUNC_CODE
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// look for "NETSCAPE2.0" app extension
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&& eb1->ByteCount == 11
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&& !memcmp((const char*)(eb1->Bytes), "NETSCAPE2.0", 11)
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// verify extension contents and get loop count
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&& eb2->Function == CONTINUE_EXT_FUNC_CODE
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&& eb2->ByteCount == 3
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&& eb2->Bytes[0] == 1) {
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mLoopCount = (int)(eb2->Bytes[2] << 8) + (int)(eb2->Bytes[1]);
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}
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}
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DGifSavedExtensionToGCB(mGif, i, &gcb);
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// timing
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durationMs += getDelayMs(gcb);
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// preserve logic
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mPreservedFrames[i] = false;
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mRestoringFrames[i] = -1;
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if (gcb.DisposalMode == DISPOSE_PREVIOUS && lastUnclearedFrame >= 0) {
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mPreservedFrames[lastUnclearedFrame] = true;
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mRestoringFrames[i] = lastUnclearedFrame;
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}
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if (!willBeCleared(gcb)) {
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lastUnclearedFrame = i;
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}
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}
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#if GIF_DEBUG
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ALOGD("FrameSequence_gif created with size %d %d, frames %d dur %ld",
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mGif->SWidth, mGif->SHeight, mGif->ImageCount, durationMs);
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for (int i = 0; i < mGif->ImageCount; i++) {
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DGifSavedExtensionToGCB(mGif, i, &gcb);
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ALOGD(" Frame %d - must preserve %d, restore point %d, trans color %d",
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i, mPreservedFrames[i], mRestoringFrames[i], gcb.TransparentColor);
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}
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#endif
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const ColorMapObject* cmap = mGif->SColorMap;
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if (cmap) {
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// calculate bg color
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GraphicsControlBlock gcb;
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DGifSavedExtensionToGCB(mGif, 0, &gcb);
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if (gcb.TransparentColor == NO_TRANSPARENT_COLOR
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&& mGif->SBackGroundColor < cmap->ColorCount) {
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mBgColor = gifColorToColor8888(cmap->Colors[mGif->SBackGroundColor]);
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}
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}
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}
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FrameSequence_gif::~FrameSequence_gif() {
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if (mGif) {
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DGifCloseFile(mGif, NULL);
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}
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delete[] mPreservedFrames;
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delete[] mRestoringFrames;
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}
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FrameSequenceState* FrameSequence_gif::createState() const {
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return new FrameSequenceState_gif(*this);
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}
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////////////////////////////////////////////////////////////////////////////////
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// draw helpers
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////////////////////////////////////////////////////////////////////////////////
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// return true if area of 'target' is completely covers area of 'covered'
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static bool checkIfCover(const GifImageDesc& target, const GifImageDesc& covered) {
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return target.Left <= covered.Left
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&& covered.Left + covered.Width <= target.Left + target.Width
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&& target.Top <= covered.Top
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&& covered.Top + covered.Height <= target.Top + target.Height;
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}
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static void copyLine(Color8888* dst, const unsigned char* src, const ColorMapObject* cmap,
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int transparent, int width) {
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for (; width > 0; width--, src++, dst++) {
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if (*src != transparent && *src < cmap->ColorCount) {
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*dst = gifColorToColor8888(cmap->Colors[*src]);
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}
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}
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}
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static void setLineColor(Color8888* dst, Color8888 color, int width) {
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for (; width > 0; width--, dst++) {
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*dst = color;
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}
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}
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static void getCopySize(const GifImageDesc& imageDesc, int maxWidth, int maxHeight,
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GifWord& copyWidth, GifWord& copyHeight) {
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copyWidth = imageDesc.Width;
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if (imageDesc.Left + copyWidth > maxWidth) {
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copyWidth = maxWidth - imageDesc.Left;
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}
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copyHeight = imageDesc.Height;
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if (imageDesc.Top + copyHeight > maxHeight) {
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copyHeight = maxHeight - imageDesc.Top;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// Frame sequence state
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////////////////////////////////////////////////////////////////////////////////
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FrameSequenceState_gif::FrameSequenceState_gif(const FrameSequence_gif& frameSequence) :
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mFrameSequence(frameSequence), mPreserveBuffer(NULL), mPreserveBufferFrame(-1) {
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}
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FrameSequenceState_gif::~FrameSequenceState_gif() {
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delete[] mPreserveBuffer;
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}
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void FrameSequenceState_gif::savePreserveBuffer(Color8888* outputPtr, int outputPixelStride, int frameNr) {
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if (frameNr == mPreserveBufferFrame) return;
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mPreserveBufferFrame = frameNr;
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const int width = mFrameSequence.getWidth();
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const int height = mFrameSequence.getHeight();
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if (!mPreserveBuffer) {
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mPreserveBuffer = new Color8888[width * height];
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}
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for (int y = 0; y < height; y++) {
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memcpy(mPreserveBuffer + width * y,
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outputPtr + outputPixelStride * y,
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width * 4);
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}
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}
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void FrameSequenceState_gif::restorePreserveBuffer(Color8888* outputPtr, int outputPixelStride) {
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const int width = mFrameSequence.getWidth();
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const int height = mFrameSequence.getHeight();
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if (!mPreserveBuffer) {
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ALOGD("preserve buffer not allocated! ah!");
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return;
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}
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for (int y = 0; y < height; y++) {
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memcpy(outputPtr + outputPixelStride * y,
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mPreserveBuffer + width * y,
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width * 4);
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}
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}
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long FrameSequenceState_gif::drawFrame(int frameNr,
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Color8888* outputPtr, int outputPixelStride, int previousFrameNr) {
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GifFileType* gif = mFrameSequence.getGif();
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if (!gif) {
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ALOGD("Cannot drawFrame, mGif is NULL");
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return -1;
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}
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#if GIF_DEBUG
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ALOGD(" drawFrame on %p nr %d on addr %p, previous frame nr %d",
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this, frameNr, outputPtr, previousFrameNr);
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#endif
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const int height = mFrameSequence.getHeight();
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const int width = mFrameSequence.getWidth();
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GraphicsControlBlock gcb;
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int start = max(previousFrameNr + 1, 0);
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for (int i = max(start - 1, 0); i < frameNr; i++) {
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int neededPreservedFrame = mFrameSequence.getRestoringFrame(i);
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if (neededPreservedFrame >= 0 && (mPreserveBufferFrame != neededPreservedFrame)) {
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#if GIF_DEBUG
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ALOGD("frame %d needs frame %d preserved, but %d is currently, so drawing from scratch",
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i, neededPreservedFrame, mPreserveBufferFrame);
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#endif
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start = 0;
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}
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}
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for (int i = start; i <= frameNr; i++) {
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DGifSavedExtensionToGCB(gif, i, &gcb);
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const SavedImage& frame = gif->SavedImages[i];
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#if GIF_DEBUG
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bool frameOpaque = gcb.TransparentColor == NO_TRANSPARENT_COLOR;
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ALOGD("producing frame %d, drawing frame %d (opaque %d, disp %d, del %d)",
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frameNr, i, frameOpaque, gcb.DisposalMode, gcb.DelayTime);
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#endif
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if (i == 0) {
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//clear bitmap
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Color8888 bgColor = mFrameSequence.getBackgroundColor();
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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outputPtr[y * outputPixelStride + x] = bgColor;
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}
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}
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} else {
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GraphicsControlBlock prevGcb;
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DGifSavedExtensionToGCB(gif, i - 1, &prevGcb);
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const SavedImage& prevFrame = gif->SavedImages[i - 1];
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bool prevFrameDisposed = willBeCleared(prevGcb);
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bool newFrameOpaque = gcb.TransparentColor == NO_TRANSPARENT_COLOR;
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bool prevFrameCompletelyCovered = newFrameOpaque
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&& checkIfCover(frame.ImageDesc, prevFrame.ImageDesc);
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if (prevFrameDisposed && !prevFrameCompletelyCovered) {
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switch (prevGcb.DisposalMode) {
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case DISPOSE_BACKGROUND: {
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Color8888* dst = outputPtr + prevFrame.ImageDesc.Left +
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prevFrame.ImageDesc.Top * outputPixelStride;
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GifWord copyWidth, copyHeight;
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getCopySize(prevFrame.ImageDesc, width, height, copyWidth, copyHeight);
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for (; copyHeight > 0; copyHeight--) {
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setLineColor(dst, TRANSPARENT, copyWidth);
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dst += outputPixelStride;
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}
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} break;
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case DISPOSE_PREVIOUS: {
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restorePreserveBuffer(outputPtr, outputPixelStride);
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} break;
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}
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}
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if (mFrameSequence.getPreservedFrame(i - 1)) {
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// currently drawn frame will be restored by a following DISPOSE_PREVIOUS draw, so
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// we preserve it
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savePreserveBuffer(outputPtr, outputPixelStride, i - 1);
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}
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}
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bool willBeCleared = gcb.DisposalMode == DISPOSE_BACKGROUND
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|| gcb.DisposalMode == DISPOSE_PREVIOUS;
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if (i == frameNr || !willBeCleared) {
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const ColorMapObject* cmap = gif->SColorMap;
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if (frame.ImageDesc.ColorMap) {
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cmap = frame.ImageDesc.ColorMap;
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}
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// If a cmap is missing, the frame can't be decoded, so we skip it.
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if (cmap) {
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const unsigned char* src = (unsigned char*)frame.RasterBits;
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Color8888* dst = outputPtr + frame.ImageDesc.Left +
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frame.ImageDesc.Top * outputPixelStride;
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GifWord copyWidth, copyHeight;
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getCopySize(frame.ImageDesc, width, height, copyWidth, copyHeight);
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for (; copyHeight > 0; copyHeight--) {
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copyLine(dst, src, cmap, gcb.TransparentColor, copyWidth);
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src += frame.ImageDesc.Width;
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dst += outputPixelStride;
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}
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}
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}
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}
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// return last frame's delay
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const int maxFrame = gif->ImageCount;
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const int lastFrame = (frameNr + maxFrame - 1) % maxFrame;
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DGifSavedExtensionToGCB(gif, lastFrame, &gcb);
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return getDelayMs(gcb);
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}
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////////////////////////////////////////////////////////////////////////////////
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// Registry
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////////////////////////////////////////////////////////////////////////////////
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#include "Registry.h"
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static bool isGif(void* header, int header_size) {
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return !memcmp(GIF_STAMP, header, GIF_STAMP_LEN)
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|| !memcmp(GIF87_STAMP, header, GIF_STAMP_LEN)
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|| !memcmp(GIF89_STAMP, header, GIF_STAMP_LEN);
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}
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static bool acceptsBuffers() {
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return false;
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}
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static FrameSequence* createFramesequence(Stream* stream) {
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return new FrameSequence_gif(stream);
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}
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static RegistryEntry gEntry = {
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GIF_STAMP_LEN,
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isGif,
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createFramesequence,
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NULL,
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acceptsBuffers,
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};
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static Registry gRegister(gEntry);
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