Implementation of the displacement effect (both CPU and GPU)
TEST=Added new GM called "displacement"
Review URL: https://codereview.appspot.com/7058075
git-svn-id: http://skia.googlecode.com/svn/trunk@7182 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/displacement.cpp b/gm/displacement.cpp
new file mode 100644
index 0000000..342806d
--- /dev/null
+++ b/gm/displacement.cpp
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2013 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 "SkDisplacementMapEffect.h"
+#include "SkBitmapSource.h"
+
+namespace skiagm {
+
+class DisplacementMapGM : public GM {
+public:
+ DisplacementMapGM() : fInitialized(false) {
+ this->setBGColor(0xFF000000);
+ }
+
+protected:
+ virtual SkString onShortName() {
+ return SkString("displacement");
+ }
+
+ void make_bitmap() {
+ fBitmap.setConfig(SkBitmap::kARGB_8888_Config, 80, 80);
+ fBitmap.allocPixels();
+ SkDevice device(fBitmap);
+ SkCanvas canvas(&device);
+ canvas.clear(0x00000000);
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ paint.setColor(0xFF884422);
+ paint.setTextSize(SkIntToScalar(96));
+ const char* str = "g";
+ canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(55), paint);
+ }
+
+ void make_checkerboard() {
+ fCheckerboard.setConfig(SkBitmap::kARGB_8888_Config, 80, 80);
+ fCheckerboard.allocPixels();
+ SkDevice device(fCheckerboard);
+ SkCanvas canvas(&device);
+ canvas.clear(0x00000000);
+ SkPaint darkPaint;
+ darkPaint.setColor(0xFF804020);
+ SkPaint lightPaint;
+ lightPaint.setColor(0xFF244484);
+ for (int y = 0; y < 80; y += 16) {
+ for (int x = 0; x < 80; x += 16) {
+ canvas.save();
+ canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
+ canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
+ canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
+ canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
+ canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
+ canvas.restore();
+ }
+ }
+ }
+
+ virtual SkISize onISize() {
+ return make_isize(500, 200);
+ }
+
+ void drawClippedBitmap(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
+ canvas->save();
+ canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
+ SkIntToScalar(fBitmap.width()), SkIntToScalar(fBitmap.height())));
+ canvas->drawBitmap(fBitmap, SkIntToScalar(x), SkIntToScalar(y), &paint);
+ canvas->restore();
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ if (!fInitialized) {
+ make_bitmap();
+ make_checkerboard();
+ fInitialized = true;
+ }
+ canvas->clear(0x00000000);
+ SkPaint paint;
+ SkAutoTUnref<SkImageFilter> displ(SkNEW_ARGS(SkBitmapSource, (fCheckerboard)));
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kR_ChannelSelectorType,
+ SkDisplacementMapEffect::kG_ChannelSelectorType, 0.0f, displ)))->unref();
+ drawClippedBitmap(canvas, 0, 0, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kB_ChannelSelectorType,
+ SkDisplacementMapEffect::kA_ChannelSelectorType, 0.2f, displ)))->unref();
+ drawClippedBitmap(canvas, 100, 0, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kR_ChannelSelectorType,
+ SkDisplacementMapEffect::kB_ChannelSelectorType, 0.4f, displ)))->unref();
+ drawClippedBitmap(canvas, 200, 0, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kG_ChannelSelectorType,
+ SkDisplacementMapEffect::kA_ChannelSelectorType, 0.6f, displ)))->unref();
+ drawClippedBitmap(canvas, 300, 0, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kR_ChannelSelectorType,
+ SkDisplacementMapEffect::kA_ChannelSelectorType, 0.8f, displ)))->unref();
+ drawClippedBitmap(canvas, 400, 0, paint);
+
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kR_ChannelSelectorType,
+ SkDisplacementMapEffect::kG_ChannelSelectorType, 0.5f, displ)))->unref();
+ drawClippedBitmap(canvas, 0, 100, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kB_ChannelSelectorType,
+ SkDisplacementMapEffect::kA_ChannelSelectorType, 0.5f, displ)))->unref();
+ drawClippedBitmap(canvas, 100, 100, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kR_ChannelSelectorType,
+ SkDisplacementMapEffect::kB_ChannelSelectorType, 0.5f, displ)))->unref();
+ drawClippedBitmap(canvas, 200, 100, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kG_ChannelSelectorType,
+ SkDisplacementMapEffect::kA_ChannelSelectorType, 0.5f, displ)))->unref();
+ drawClippedBitmap(canvas, 300, 100, paint);
+ paint.setImageFilter(SkNEW_ARGS(SkDisplacementMapEffect,
+ (SkDisplacementMapEffect::kR_ChannelSelectorType,
+ SkDisplacementMapEffect::kA_ChannelSelectorType, 0.5f, displ)))->unref();
+ drawClippedBitmap(canvas, 400, 100, paint);
+ }
+
+private:
+ typedef GM INHERITED;
+ SkBitmap fBitmap, fCheckerboard;
+ bool fInitialized;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new DisplacementMapGM; }
+static GMRegistry reg(MyFactory);
+
+}