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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #include "gm.h" |
| 9 #include "SkAnimTimer.h" |
| 10 #include "SkCanvas.h" |
| 11 #include "SkCodec.h" |
| 12 #include "SkColor.h" |
| 13 #include "SkCommandLineFlags.h" |
| 14 #include "SkPaint.h" |
| 15 #include "SkString.h" |
| 16 #include "Resources.h" |
| 17 |
| 18 #include <vector> |
| 19 |
| 20 DEFINE_string(animatedGif, "test640x479.gif", "Animated gif in resources folder"
); |
| 21 |
| 22 namespace { |
| 23 void error(SkCanvas* canvas, const SkString& errorText) { |
| 24 constexpr SkScalar kOffset = 5.0f; |
| 25 canvas->drawColor(SK_ColorRED); |
| 26 SkPaint paint; |
| 27 SkRect bounds; |
| 28 paint.measureText(errorText.c_str(), errorText.size(), &bounds); |
| 29 canvas->drawText(errorText.c_str(), errorText.size(), kOffset, bounds.he
ight() + kOffset, |
| 30 paint); |
| 31 } |
| 32 } |
| 33 |
| 34 class AnimatedGifGM : public skiagm::GM { |
| 35 private: |
| 36 std::unique_ptr<SkCodec> fCodec; |
| 37 size_t fFrame; |
| 38 double fNextUpdate; |
| 39 size_t fTotalFrames; |
| 40 std::vector<SkCodec::FrameInfo> fFrameInfos; |
| 41 std::vector<SkBitmap> fFrames; |
| 42 |
| 43 void drawBounds(SkCanvas* canvas) { |
| 44 if (!fCodec) { |
| 45 return; |
| 46 } |
| 47 const SkIRect bounds = fCodec->getInfo().bounds().makeOutset(1, 1); |
| 48 SkPaint boundsPaint; |
| 49 boundsPaint.setStyle(SkPaint::kStroke_Style); |
| 50 canvas->drawIRect(bounds, boundsPaint); |
| 51 } |
| 52 |
| 53 void drawFrame(SkCanvas* canvas, int frameIndex) { |
| 54 // FIXME: Create from an Image/ImageGenerator? |
| 55 if (frameIndex >= (int) fFrames.size()) { |
| 56 fFrames.resize(frameIndex + 1); |
| 57 } |
| 58 SkBitmap& bm = fFrames[frameIndex]; |
| 59 if (!bm.getPixels()) { |
| 60 const SkImageInfo info = fCodec->getInfo().makeColorType(kN32_SkColo
rType); |
| 61 bm.allocPixels(info); |
| 62 |
| 63 SkCodec::MultiFrameOptions multiOpts; |
| 64 multiOpts.fIndex = frameIndex; |
| 65 multiOpts.fHasPriorFrame = false; |
| 66 const size_t requiredFrame = fFrameInfos[frameIndex].fRequiredFrame; |
| 67 if (requiredFrame != SkCodec::kIndependentFrame) { |
| 68 SkASSERT(requiredFrame < fFrames.size()); |
| 69 SkBitmap& requiredBitmap = fFrames[requiredFrame]; |
| 70 // For simplicity, do not try to cache old frames |
| 71 if (requiredBitmap.getPixels() && requiredBitmap.copyTo(&bm)) { |
| 72 multiOpts.fHasPriorFrame = true; |
| 73 } |
| 74 } |
| 75 |
| 76 SkCodec::Options opts; |
| 77 opts.fFrameOptions = &multiOpts; |
| 78 if (SkCodec::kSuccess != fCodec->getPixels(info, bm.getPixels(), |
| 79 bm.rowBytes(), &opts, |
| 80 nullptr, nullptr)) { |
| 81 SkDebugf("Could not getPixels for frame %i: %s", frameIndex, FLA
GS_animatedGif[0]); |
| 82 return; |
| 83 } |
| 84 } |
| 85 |
| 86 canvas->drawBitmap(bm, 0, 0); |
| 87 } |
| 88 |
| 89 public: |
| 90 AnimatedGifGM() |
| 91 : fFrame(0) |
| 92 , fNextUpdate (-1) |
| 93 , fTotalFrames (-1) {} |
| 94 |
| 95 private: |
| 96 SkString onShortName() override { |
| 97 return SkString("animatedGif"); |
| 98 } |
| 99 |
| 100 SkISize onISize() override { |
| 101 if (this->initCodec()) { |
| 102 SkISize dim = fCodec->getInfo().dimensions(); |
| 103 // Wide enough to display all the frames. |
| 104 dim.fWidth *= fTotalFrames; |
| 105 // Tall enough to show the row of frames plus an animating version. |
| 106 dim.fHeight *= 2; |
| 107 return dim; |
| 108 } |
| 109 return SkISize::Make(640, 480); |
| 110 } |
| 111 |
| 112 void onDrawBackground(SkCanvas* canvas) override { |
| 113 if (this->initCodec()) { |
| 114 SkAutoCanvasRestore acr(canvas, true); |
| 115 // FIXME: Draw a checkerboard here |
| 116 for (size_t frameIndex = 0; frameIndex < fTotalFrames; frameIndex++)
{ |
| 117 this->drawBounds(canvas); |
| 118 this->drawFrame(canvas, frameIndex); |
| 119 canvas->translate(fCodec->getInfo().width(), 0); |
| 120 } |
| 121 } |
| 122 } |
| 123 |
| 124 bool initCodec() { |
| 125 if (fCodec) { |
| 126 return true; |
| 127 } |
| 128 if (FLAGS_animatedGif.isEmpty()) { |
| 129 SkDebugf("Nothing specified for --animatedGif!"); |
| 130 return false; |
| 131 } |
| 132 |
| 133 std::unique_ptr<SkStream> stream(GetResourceAsStream(FLAGS_animatedGif[0
])); |
| 134 if (!stream) { |
| 135 SkDebugf("Could not find %s", FLAGS_animatedGif[0]); |
| 136 return false; |
| 137 } |
| 138 |
| 139 fCodec.reset(SkCodec::NewFromStream(stream.release())); |
| 140 if (!fCodec) { |
| 141 SkDebugf("Could create codec from %s", FLAGS_animatedGif[0]); |
| 142 return false; |
| 143 } |
| 144 |
| 145 fFrame = 0; |
| 146 fFrameInfos = fCodec->getFrameInfo(); |
| 147 fTotalFrames = fFrameInfos.size(); |
| 148 return true; |
| 149 } |
| 150 |
| 151 void onDraw(SkCanvas* canvas) { |
| 152 if (!fCodec) { |
| 153 SkString errorText = SkStringPrintf("Nothing to draw; %s", FLAGS_ani
matedGif[0]); |
| 154 error(canvas, errorText); |
| 155 return; |
| 156 } |
| 157 |
| 158 // Now draw it animated. |
| 159 SkAutoCanvasRestore acr(canvas, true); |
| 160 canvas->translate(0, fCodec->getInfo().height()); |
| 161 this->drawBounds(canvas); |
| 162 this->drawFrame(canvas, fFrame); |
| 163 } |
| 164 |
| 165 bool onAnimate(const SkAnimTimer& timer) override { |
| 166 if (!fCodec || fTotalFrames == 1) { |
| 167 return false; |
| 168 } |
| 169 |
| 170 double secs = timer.msec() * .1; |
| 171 if (fNextUpdate < double(0)) { |
| 172 // This is a sentinel that we have not done any updates yet. |
| 173 // I'm assuming this gets called *after* onOnceBeforeDraw, so our fi
rst frame should |
| 174 // already have been retrieved. |
| 175 SkASSERT(fFrame == 0); |
| 176 fNextUpdate = secs + fFrameInfos[fFrame].fDuration; |
| 177 |
| 178 return true; |
| 179 } |
| 180 |
| 181 if (secs < fNextUpdate) { |
| 182 return true; |
| 183 } |
| 184 |
| 185 while (secs >= fNextUpdate) { |
| 186 // Retrieve the next frame. |
| 187 fFrame++; |
| 188 if (fFrame == fTotalFrames) { |
| 189 fFrame = 0; |
| 190 } |
| 191 |
| 192 // Note that we loop here. This is not safe if we need to draw the i
ntermediate frame |
| 193 // in order to draw correctly. |
| 194 fNextUpdate += fFrameInfos[fFrame].fDuration; |
| 195 } |
| 196 |
| 197 return true; |
| 198 } |
| 199 }; |
| 200 |
| 201 DEF_GM(return new AnimatedGifGM); |
| 202 |
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