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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkAnimTimer.h"
#include "SkCanvas.h"
#include "SkCodec.h"
#include "SkColor.h"
#include "SkCommandLineFlags.h"
#include "SkPaint.h"
#include "SkString.h"
#include "Resources.h"
#include <vector>
DEFINE_string(animatedGif, "test640x479.gif", "Animated gif in resources folder");
namespace {
void error(SkCanvas* canvas, const SkString& errorText) {
constexpr SkScalar kOffset = 5.0f;
canvas->drawColor(SK_ColorRED);
SkPaint paint;
SkRect bounds;
paint.measureText(errorText.c_str(), errorText.size(), &bounds);
canvas->drawText(errorText.c_str(), errorText.size(), kOffset, bounds.height() + kOffset,
paint);
}
}
class AnimatedGifGM : public skiagm::GM {
private:
std::unique_ptr<SkCodec> fCodec;
size_t fFrame;
double fNextUpdate;
size_t fTotalFrames;
std::vector<SkCodec::FrameInfo> fFrameInfos;
std::vector<SkBitmap> fFrames;
void drawFrame(SkCanvas* canvas, int frameIndex) {
// FIXME: Create from an Image/ImageGenerator?
if (frameIndex >= (int) fFrames.size()) {
fFrames.resize(frameIndex + 1);
}
SkBitmap& bm = fFrames[frameIndex];
if (!bm.getPixels()) {
const SkImageInfo info = fCodec->getInfo().makeColorType(kN32_SkColorType);
bm.allocPixels(info);
SkCodec::Options opts;
opts.fFrameIndex = frameIndex;
opts.fHasPriorFrame = false;
const size_t requiredFrame = fFrameInfos[frameIndex].fRequiredFrame;
if (requiredFrame != SkCodec::kNone) {
SkASSERT(requiredFrame < fFrames.size());
SkBitmap& requiredBitmap = fFrames[requiredFrame];
// For simplicity, do not try to cache old frames
if (requiredBitmap.getPixels() && requiredBitmap.copyTo(&bm)) {
opts.fHasPriorFrame = true;
}
}
if (SkCodec::kSuccess != fCodec->getPixels(info, bm.getPixels(),
bm.rowBytes(), &opts,
nullptr, nullptr)) {
SkDebugf("Could not getPixels for frame %i: %s", frameIndex, FLAGS_animatedGif[0]);
return;
}
}
canvas->drawBitmap(bm, 0, 0);
}
public:
AnimatedGifGM()
: fFrame(0)
, fNextUpdate (-1)
, fTotalFrames (-1) {}
private:
SkString onShortName() override {
return SkString("animatedGif");
}
SkISize onISize() override {
if (this->initCodec()) {
SkISize dim = fCodec->getInfo().dimensions();
// Wide enough to display all the frames.
dim.fWidth *= fTotalFrames;
// Tall enough to show the row of frames plus an animating version.
dim.fHeight *= 2;
return dim;
}
return SkISize::Make(640, 480);
}
void onDrawBackground(SkCanvas* canvas) override {
canvas->clear(SK_ColorWHITE);
if (this->initCodec()) {
SkAutoCanvasRestore acr(canvas, true);
for (size_t frameIndex = 0; frameIndex < fTotalFrames; frameIndex++) {
this->drawFrame(canvas, frameIndex);
canvas->translate(SkIntToScalar(fCodec->getInfo().width()), 0);
}
}
}
bool initCodec() {
if (fCodec) {
return true;
}
if (FLAGS_animatedGif.isEmpty()) {
SkDebugf("Nothing specified for --animatedGif!");
return false;
}
std::unique_ptr<SkStream> stream(GetResourceAsStream(FLAGS_animatedGif[0]));
if (!stream) {
return false;
}
fCodec.reset(SkCodec::NewFromStream(stream.release()));
if (!fCodec) {
SkDebugf("Could create codec from %s", FLAGS_animatedGif[0]);
return false;
}
fFrame = 0;
fFrameInfos = fCodec->getFrameInfo();
fTotalFrames = fFrameInfos.size();
return true;
}
void onDraw(SkCanvas* canvas) override {
if (!fCodec) {
SkString errorText = SkStringPrintf("Nothing to draw; %s", FLAGS_animatedGif[0]);
error(canvas, errorText);
return;
}
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(0, SkIntToScalar(fCodec->getInfo().height()));
this->drawFrame(canvas, fFrame);
}
bool onAnimate(const SkAnimTimer& timer) override {
if (!fCodec || fTotalFrames == 1) {
return false;
}
double secs = timer.msec() * .1;
if (fNextUpdate < double(0)) {
// This is a sentinel that we have not done any updates yet.
// I'm assuming this gets called *after* onOnceBeforeDraw, so our first frame should
// already have been retrieved.
SkASSERT(fFrame == 0);
fNextUpdate = secs + fFrameInfos[fFrame].fDuration;
return true;
}
if (secs < fNextUpdate) {
return true;
}
while (secs >= fNextUpdate) {
// Retrieve the next frame.
fFrame++;
if (fFrame == fTotalFrames) {
fFrame = 0;
}
// Note that we loop here. This is not safe if we need to draw the intermediate frame
// in order to draw correctly.
fNextUpdate += fFrameInfos[fFrame].fDuration;
}
return true;
}
};
DEF_GM(return new AnimatedGifGM);
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