PDF: Add (low-memory) SkPDFBitmap class

gm/repeated_bitmap.cpp

+/*
+ * Copyright 2015 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 "sk_tool_utils.h"
+#include "Resources.h"
+
+DEF_SIMPLE_GM(repeated_bitmap, canvas, 576, 576) {
+    sk_tool_utils::draw_checkerboard(canvas, 0xFF999999, SK_ColorWHITE, 12);
+    SkRect rect = SkRect::MakeLTRB(-4.25f, -4.25f, 4.25f, 4.25f);
+    SkPaint paint;
+    paint.setColor(0xFF333333);
+    SkBitmap bm;
+    if (GetResourceAsBitmap("randPixels.png", &bm)) {
+        for (int j = 0; j < 4; ++j) {
+            for (int i = 0; i < 4; ++i) {
+                SkAutoCanvasRestore autoCanvasRestore(canvas, true);
+                canvas->scale(12.0f, 12.0f);
+                canvas->translate(6.0f + 12.0f * SkIntToScalar(i),
+                                  6.0f + 12.0f * SkIntToScalar(j));
+                canvas->rotate(18.0f * (i + 4 * j));
+                canvas->drawRect(rect, paint);
+                canvas->drawBitmap(bm, -4.0f, -4.0f);
+            }
+        }
+    }
+}