SampleAnimatedImage.cpp 3.8 KB

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  1. /*
  2. * Copyright 2018 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. #include "include/android/SkAnimatedImage.h"
  8. #include "include/codec/SkAndroidCodec.h"
  9. #include "include/core/SkCanvas.h"
  10. #include "include/core/SkFont.h"
  11. #include "include/core/SkPaint.h"
  12. #include "include/core/SkPictureRecorder.h"
  13. #include "include/core/SkRect.h"
  14. #include "include/core/SkScalar.h"
  15. #include "include/core/SkString.h"
  16. #include "tools/timer/TimeUtils.h"
  17. #include "samplecode/Sample.h"
  18. #include "tools/Resources.h"
  19. static constexpr char kPauseKey = 'p';
  20. static constexpr char kResetKey = 'r';
  21. class SampleAnimatedImage : public Sample {
  22. sk_sp<SkAnimatedImage> fImage;
  23. sk_sp<SkDrawable> fDrawable;
  24. SkScalar fYOffset = 0;
  25. bool fRunning = false;
  26. double fCurrentTime = 0.0;
  27. double fLastWallTime = 0.0;
  28. double fTimeToShowNextFrame = 0.0;
  29. void onDrawBackground(SkCanvas* canvas) override {
  30. SkFont font;
  31. font.setSize(20);
  32. SkString str = SkStringPrintf("Press '%c' to start/pause; '%c' to reset.",
  33. kPauseKey, kResetKey);
  34. const char* text = str.c_str();
  35. SkRect bounds;
  36. font.measureText(text, strlen(text), SkTextEncoding::kUTF8, &bounds);
  37. fYOffset = bounds.height();
  38. canvas->drawSimpleText(text, strlen(text), SkTextEncoding::kUTF8, 5, fYOffset, font, SkPaint());
  39. fYOffset *= 2;
  40. }
  41. void onDrawContent(SkCanvas* canvas) override {
  42. if (!fImage) {
  43. return;
  44. }
  45. canvas->translate(0, fYOffset);
  46. canvas->drawDrawable(fImage.get());
  47. canvas->drawDrawable(fDrawable.get(), fImage->getBounds().width(), 0);
  48. }
  49. bool onAnimate(double nanos) override {
  50. if (!fImage) {
  51. return false;
  52. }
  53. const double lastWallTime = fLastWallTime;
  54. fLastWallTime = TimeUtils::NanosToMSec(nanos);
  55. if (fRunning) {
  56. fCurrentTime += fLastWallTime - lastWallTime;
  57. if (fCurrentTime > fTimeToShowNextFrame) {
  58. fTimeToShowNextFrame += fImage->decodeNextFrame();
  59. if (fImage->isFinished()) {
  60. fRunning = false;
  61. }
  62. }
  63. }
  64. return true;
  65. }
  66. void onOnceBeforeDraw() override {
  67. sk_sp<SkData> file(GetResourceAsData("images/alphabetAnim.gif"));
  68. std::unique_ptr<SkCodec> codec(SkCodec::MakeFromData(file));
  69. if (!codec) {
  70. return;
  71. }
  72. fImage = SkAnimatedImage::Make(SkAndroidCodec::MakeFromCodec(std::move(codec)));
  73. if (!fImage) {
  74. return;
  75. }
  76. fTimeToShowNextFrame = fImage->currentFrameDuration();
  77. SkPictureRecorder recorder;
  78. auto canvas = recorder.beginRecording(fImage->getBounds());
  79. canvas->drawDrawable(fImage.get());
  80. fDrawable = recorder.finishRecordingAsDrawable();
  81. }
  82. SkString name() override { return SkString("AnimatedImage"); }
  83. bool onChar(SkUnichar uni) override {
  84. if (fImage) {
  85. switch (uni) {
  86. case kPauseKey:
  87. fRunning = !fRunning;
  88. if (fImage->isFinished()) {
  89. // fall through
  90. } else {
  91. return true;
  92. }
  93. case kResetKey:
  94. fImage->reset();
  95. fCurrentTime = fLastWallTime;
  96. fTimeToShowNextFrame = fCurrentTime + fImage->currentFrameDuration();
  97. return true;
  98. default:
  99. break;
  100. }
  101. }
  102. return false;
  103. }
  104. };
  105. DEF_SAMPLE( return new SampleAnimatedImage(); )