Restyle SkPDFImageShader and support tiling bitmaps outside clip bounds
BUG=chromium:99458
R=edisonn@google.com, vandebo@chromium.org
Author: richardlin@chromium.org
Review URL: https://chromiumcodereview.appspot.com/22884013
git-svn-id: http://skia.googlecode.com/svn/trunk@10870 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/clippedbitmapshaders.cpp b/gm/clippedbitmapshaders.cpp
new file mode 100644
index 0000000..02d07bf
--- /dev/null
+++ b/gm/clippedbitmapshaders.cpp
@@ -0,0 +1,118 @@
+/*
+ * 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 "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkColor.h"
+#include "SkShader.h"
+
+namespace skiagm {
+
+// This GM draws a 3x3 grid (with the center element excluded) of rectangles
+// filled with a bitmap shader. The bitmap shader is transformed so that the
+// pattern cell is at the center (excluded) region.
+//
+// In Repeat and Mirror mode, this tests that the bitmap shader still draws
+// even though the pattern cell is outside the clip.
+//
+// In Clamp mode, this tests that the clamp is handled properly. For PDF,
+// (and possibly other exported formats) this also "tests" that the image itself
+// is not stored (well, you'll need to open it up with an external tool to
+// verify that).
+
+static SkBitmap create_bitmap() {
+ SkBitmap bmp;
+ bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
+ bmp.allocPixels();
+ bmp.lockPixels();
+ uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
+ pixels[0] = SkPreMultiplyColor(SK_ColorRED);
+ pixels[1] = SkPreMultiplyColor(SK_ColorGREEN);
+ pixels[2] = SkPreMultiplyColor(SK_ColorBLACK);
+ pixels[3] = SkPreMultiplyColor(SK_ColorBLUE);
+ bmp.unlockPixels();
+
+ return bmp;
+}
+
+static const SkScalar RECT_SIZE = 64;
+static const SkScalar SLIDE_SIZE = 300;
+
+class ClippedBitmapShadersGM : public GM {
+public:
+ ClippedBitmapShadersGM(SkShader::TileMode mode)
+ : fMode(mode) {
+ }
+
+protected:
+ SkShader::TileMode fMode;
+
+ virtual SkString onShortName() {
+ SkString descriptor;
+ switch (fMode) {
+ case SkShader::kRepeat_TileMode:
+ descriptor = "tile";
+ break;
+ case SkShader::kMirror_TileMode:
+ descriptor = "mirror";
+ break;
+ case SkShader::kClamp_TileMode:
+ descriptor = "clamp";
+ break;
+ default:
+ SkASSERT(false);
+ }
+ descriptor.prepend("clipped-bitmap-shaders-");
+ return descriptor;
+ }
+
+ virtual SkISize onISize() {
+ return SkISize::Make(300, 300);
+ }
+
+ virtual void onDraw(SkCanvas* canvas) {
+ SkBitmap bmp = create_bitmap();
+ SkShader* shader = SkShader::CreateBitmapShader(
+ bmp, fMode, fMode);
+
+ SkPaint paint;
+ SkMatrix s;
+ s.reset();
+ s.setScale(8, 8);
+ s.postTranslate(SLIDE_SIZE / 2, SLIDE_SIZE / 2);
+ shader->setLocalMatrix(s);
+ paint.setShader(shader)->unref();
+
+ SkScalar margin = (SLIDE_SIZE / 3 - RECT_SIZE) / 2;
+ for (int i = 0; i < 3; i++) {
+ SkScalar yOrigin = SLIDE_SIZE / 3 * i + margin;
+ for (int j = 0; j < 3; j++) {
+ SkScalar xOrigin = SLIDE_SIZE / 3 * j + margin;
+ if (i == 1 && j == 1) {
+ continue; // skip center element
+ }
+ SkRect rect = SkRect::MakeXYWH(xOrigin, yOrigin,
+ RECT_SIZE, RECT_SIZE);
+ canvas->save();
+ canvas->clipRect(rect);
+ canvas->drawRect(rect, paint);
+ canvas->restore();
+ }
+ }
+ }
+
+private:
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return new ClippedBitmapShadersGM(SkShader::kRepeat_TileMode); )
+DEF_GM( return new ClippedBitmapShadersGM(SkShader::kMirror_TileMode); )
+DEF_GM( return new ClippedBitmapShadersGM(SkShader::kClamp_TileMode); )
+}