Add GM to track thin rectangle rendering
https://codereview.chromium.org/15012024/
git-svn-id: http://skia.googlecode.com/svn/trunk@9120 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/thinrects.cpp b/gm/thinrects.cpp
new file mode 100644
index 0000000..da4ea4b
--- /dev/null
+++ b/gm/thinrects.cpp
@@ -0,0 +1,123 @@
+/*
+ * 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"
+
+namespace skiagm {
+
+// Draw various width thin rects at 1/8 horizontal pixel increments
+class ThinRectsGM : public GM {
+public:
+ ThinRectsGM() {
+ this->setBGColor(0xFF000000);
+ }
+
+protected:
+ virtual SkString onShortName() SK_OVERRIDE {
+ return SkString("thinrects");
+ }
+
+ virtual SkISize onISize() SK_OVERRIDE {
+ return make_isize(240, 320);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+
+ SkPaint white;
+ white.setColor(SK_ColorWHITE);
+ white.setAntiAlias(true);
+
+ SkPaint green;
+ green.setColor(SK_ColorGREEN);
+ green.setAntiAlias(true);
+
+ for (int i = 0; i < 8; ++i) {
+ canvas->save();
+ canvas->translate(i*0.125f, i*40.0f);
+ DrawVertRects(canvas, white);
+
+ canvas->translate(40.0f, 0.0f);
+ DrawVertRects(canvas, green);
+ canvas->restore();
+
+ canvas->save();
+ canvas->translate(80.0f, i*40.0f + i*0.125f);
+ DrawHorizRects(canvas, white);
+
+ canvas->translate(40.0f, 0.0f);
+ DrawHorizRects(canvas, green);
+ canvas->restore();
+
+ canvas->save();
+ canvas->translate(160.0f + i*0.125f,
+ i*40.0f + i*0.125f);
+ DrawSquares(canvas, white);
+
+ canvas->translate(40.0f, 0.0f);
+ DrawSquares(canvas, green);
+ canvas->restore();
+ }
+ }
+
+private:
+ static void DrawVertRects(SkCanvas* canvas, const SkPaint& p) {
+ static const SkRect vertRects[] = {
+ { 1, 1, 5.0f, 21 }, // 4 pix wide
+ { 8, 1, 10.0f, 21 }, // 2 pix wide
+ { 13, 1, 14.0f, 21 }, // 1 pix wide
+ { 17, 1, 17.5f, 21 }, // 1/2 pix wide
+ { 21, 1, 21.25f, 21 }, // 1/4 pix wide
+ { 25, 1, 25.125f, 21 }, // 1/8 pix wide
+ { 29, 1, 29.0f, 21 } // 0 pix wide
+ };
+
+ for (int j = 0; j < SK_ARRAY_COUNT(vertRects); ++j) {
+ canvas->drawRect(vertRects[j], p);
+ }
+ }
+
+ static void DrawHorizRects(SkCanvas* canvas, const SkPaint& p) {
+ static const SkRect horizRects[] = {
+ { 1, 1, 21, 5.0f }, // 4 pix high
+ { 1, 8, 21, 10.0f }, // 2 pix high
+ { 1, 13, 21, 14.0f }, // 1 pix high
+ { 1, 17, 21, 17.5f }, // 1/2 pix high
+ { 1, 21, 21, 21.25f }, // 1/4 pix high
+ { 1, 25, 21, 25.125f }, // 1/8 pix high
+ { 1, 29, 21, 29.0f } // 0 pix high
+ };
+
+ for (int j = 0; j < SK_ARRAY_COUNT(horizRects); ++j) {
+ canvas->drawRect(horizRects[j], p);
+ }
+ }
+
+ static void DrawSquares(SkCanvas* canvas, const SkPaint& p) {
+ static const SkRect squares[] = {
+ { 1, 1, 5.0f, 5.0f }, // 4 pix
+ { 8, 8, 10.0f, 10.0f }, // 2 pix
+ { 13, 13, 14.0f, 14.0f }, // 1 pix
+ { 17, 17, 17.5f, 17.5f }, // 1/2 pix
+ { 21, 21, 21.25f, 21.25f }, // 1/4 pix
+ { 25, 25, 25.125f, 25.125f }, // 1/8 pix
+ { 29, 29, 29.0f, 29.0f } // 0 pix
+ };
+
+ for (int j = 0; j < SK_ARRAY_COUNT(squares); ++j) {
+ canvas->drawRect(squares[j], p);
+ }
+ }
+
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+static GM* MyFactory(void*) { return new ThinRectsGM; }
+static GMRegistry reg(MyFactory);
+
+}