[PDF] Add GM and infrastructure to test drawing shaders with an initial transform.
Review URL: https://codereview.appspot.com/5867047
git-svn-id: http://skia.googlecode.com/svn/trunk@3450 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/shaderbounds.cpp b/gm/shaderbounds.cpp
new file mode 100644
index 0000000..d301f6c
--- /dev/null
+++ b/gm/shaderbounds.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2012 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 "SkGradientShader.h"
+
+namespace skiagm {
+
+static SkShader* MakeLinear(SkScalar width, SkScalar height, bool alternate) {
+ SkPoint pts[2] = { {0, 0}, {width, height}};
+ SkColor colors[2] = {SK_ColorRED, SK_ColorGREEN};
+ if (alternate) {
+ pts[1].fY = 0;
+ colors[0] = SK_ColorBLUE;
+ colors[1] = SK_ColorYELLOW;
+ }
+ return SkGradientShader::CreateLinear(pts, colors, NULL, 2,
+ SkShader::kClamp_TileMode, NULL);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+class ShaderBoundsGM : public GM {
+public:
+ typedef SkShader* (*ShaderGenFunc)(SkScalar width, SkScalar height,
+ bool alternate);
+ ShaderBoundsGM(ShaderGenFunc maker, const SkString& name)
+ : fShaderMaker(maker),
+ fName(name) {
+ }
+
+protected:
+ SkString onShortName() {
+ return fName;
+ }
+
+ virtual SkISize onISize() { return make_isize(320, 240); }
+
+ virtual SkMatrix onGetInitialTransform() const SK_OVERRIDE {
+ SkMatrix result;
+ SkScalar scale = SkFloatToScalar(0.8f);
+ result.setScale(scale, scale);
+ result.postTranslate(7, 23);
+ return result;
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ // The PDF device has already clipped to the content area, but we
+ // do it again here so that the raster and pdf results are consistent.
+ canvas->clipRect(SkRect::MakeWH(320, 240));
+
+ SkMatrix canvasScale;
+ SkScalar scale = SkFloatToScalar(0.7f);
+ canvasScale.setScale(scale, scale);
+ canvas->concat(canvasScale);
+
+ // Background shader.
+ SkPaint paint;
+ paint.setShader(MakeShader(559, 387, false))->unref();
+ SkRect r = SkRect::MakeXYWH(SkIntToScalar(-12), SkIntToScalar(-41),
+ SkIntToScalar(571), SkIntToScalar(428));
+ canvas->drawRect(r, paint);
+
+ // Constrained shader.
+ paint.setShader(MakeShader(101, 151, true))->unref();
+ r = SkRect::MakeXYWH(SkIntToScalar(43), SkIntToScalar(71),
+ SkIntToScalar(101), SkIntToScalar(151));
+ canvas->clipRect(r);
+ canvas->drawRect(r, paint);
+ }
+
+ SkShader* MakeShader(int width, int height, bool background) {
+ SkScalar scale = SkFloatToScalar(0.5f);
+ if (background) {
+ scale = SkFloatToScalar(0.6f);
+ }
+ SkScalar shaderWidth = SkIntToScalar(width)/scale;
+ SkScalar shaderHeight = SkIntToScalar(height)/scale;
+ SkShader* shader = fShaderMaker(shaderWidth, shaderHeight, background);
+ SkMatrix shaderScale;
+ shaderScale.setScale(scale, scale);
+ shader->setLocalMatrix(shaderScale);
+ return shader;
+ }
+
+private:
+ typedef GM INHERITED;
+
+ ShaderGenFunc fShaderMaker;
+ SkString fName;
+
+ SkShader* MakeShader(bool background);
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) {
+ return new ShaderBoundsGM(MakeLinear, SkString("shaderbounds_linear"));
+}
+static GMRegistry reg(MyFactory);
+
+}