Allow CanvasSkia to bind to an existing SkCanvas.

ui/gfx/canvas_skia.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/canvas_skia.h"
 
 #include <limits>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
@@ skipping 29 matching lines @@
 };
 
 
 }  // namespace
 
 namespace gfx {
 
 ////////////////////////////////////////////////////////////////////////////////
 // CanvasSkia, public:
 
+CanvasSkia::CanvasSkia(int width, int height, bool is_opaque)
+    : owned_canvas_(new skia::PlatformCanvas(width, height, is_opaque)),
+      canvas_(owned_canvas_.get()) {
+}
+
+CanvasSkia::CanvasSkia()
+    : owned_canvas_(new skia::PlatformCanvas()),
+      canvas_(owned_canvas_.get()) {
+}
+
+CanvasSkia::CanvasSkia(SkCanvas* canvas)
+    : owned_canvas_(),
+      canvas_(canvas) {
+  DCHECK(canvas);
+}
+
+CanvasSkia::~CanvasSkia() {
+}
+
 // static
 int CanvasSkia::DefaultCanvasTextAlignment() {
   if (!base::i18n::IsRTL())
     return gfx::Canvas::TEXT_ALIGN_LEFT;
   return gfx::Canvas::TEXT_ALIGN_RIGHT;
 }
 
 SkBitmap CanvasSkia::ExtractBitmap() const {
-  const SkBitmap& device_bitmap = getDevice()->accessBitmap(false);
+  const SkBitmap& device_bitmap = canvas_->getDevice()->accessBitmap(false);
 
   // Make a bitmap to return, and a canvas to draw into it. We don't just want
   // to call extractSubset or the copy constructor, since we want an actual copy
   // of the bitmap.
   SkBitmap result;
   device_bitmap.copyTo(&result, SkBitmap::kARGB_8888_Config);
   return result;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // CanvasSkia, Canvas implementation:
 
 void CanvasSkia::Save() {
-  save();
+  canvas_->save();
 }
 
 void CanvasSkia::SaveLayerAlpha(uint8 alpha) {
-  saveLayerAlpha(NULL, alpha);
+  canvas_->saveLayerAlpha(NULL, alpha);
 }
 
 
 void CanvasSkia::SaveLayerAlpha(uint8 alpha, const gfx::Rect& layer_bounds) {
   SkRect bounds;
   bounds.set(SkIntToScalar(layer_bounds.x()),
              SkIntToScalar(layer_bounds.y()),
              SkIntToScalar(layer_bounds.right()),
              SkIntToScalar(layer_bounds.bottom()));
-  saveLayerAlpha(&bounds, alpha);
+  canvas_->saveLayerAlpha(&bounds, alpha);
 }
 
 void CanvasSkia::Restore() {
-  restore();
+  canvas_->restore();
 }
 
 bool CanvasSkia::ClipRectInt(int x, int y, int w, int h) {
   SkRect new_clip;
   new_clip.set(SkIntToScalar(x), SkIntToScalar(y),
                SkIntToScalar(x + w), SkIntToScalar(y + h));
-  return clipRect(new_clip);
+  return canvas_->clipRect(new_clip);
 }
 
 void CanvasSkia::TranslateInt(int x, int y) {
-  translate(SkIntToScalar(x), SkIntToScalar(y));
+  canvas_->translate(SkIntToScalar(x), SkIntToScalar(y));
 }
 
 void CanvasSkia::ScaleInt(int x, int y) {
-  scale(SkIntToScalar(x), SkIntToScalar(y));
+  canvas_->scale(SkIntToScalar(x), SkIntToScalar(y));
 }
 
 void CanvasSkia::FillRectInt(const SkColor& color, int x, int y, int w, int h) {
   FillRectInt(color, x, y, w, h, SkXfermode::kSrcOver_Mode);
 }
 
 void CanvasSkia::FillRectInt(const SkColor& color,
                              int x, int y, int w, int h,
                              SkXfermode::Mode mode) {
   SkPaint paint;
@@ skipping 26 matching lines @@
   // we set a stroke width of 1, for example, this will internally create a
   // path and fill it, which causes problems near the edge of the canvas.
   paint.setStrokeWidth(SkIntToScalar(0));
   paint.setXfermodeMode(mode);
 
   DrawRectInt(x, y, w, h, paint);
 }
 
 void CanvasSkia::DrawRectInt(int x, int y, int w, int h, const SkPaint& paint) {
   SkIRect rc = { x, y, x + w, y + h };
-  drawIRect(rc, paint);
+  canvas_->drawIRect(rc, paint);
 }
 
 void CanvasSkia::DrawLineInt(const SkColor& color,
                              int x1, int y1,
                              int x2, int y2) {
   SkPaint paint;
   paint.setColor(color);
   paint.setStrokeWidth(SkIntToScalar(1));
-  drawLine(SkIntToScalar(x1), SkIntToScalar(y1), SkIntToScalar(x2),
-           SkIntToScalar(y2), paint);
+  canvas_->drawLine(SkIntToScalar(x1), SkIntToScalar(y1), SkIntToScalar(x2),
+                    SkIntToScalar(y2), paint);
 }
 
 void CanvasSkia::DrawFocusRect(int x, int y, int width, int height) {
   // Create a 2D bitmap containing alternating on/off pixels - we do this
   // so that you never get two pixels of the same color around the edges
   // of the focus rect (this may mean that opposing edges of the rect may
   // have a dot pattern out of phase to each other).
   static SkBitmap* dots = NULL;
   if (!dots) {
     int col_pixels = 32;
@@ skipping 27 matching lines @@
   paint.setShader(shader);
   shader->unref();
 
   DrawRectInt(x, y, width, 1, paint);
   DrawRectInt(x, y + height - 1, width, 1, paint);
   DrawRectInt(x, y, 1, height, paint);
   DrawRectInt(x + width - 1, y, 1, height, paint);
 }
 
 void CanvasSkia::DrawBitmapInt(const SkBitmap& bitmap, int x, int y) {
-  drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y));
+  canvas_->drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y));
 }
 
 void CanvasSkia::DrawBitmapInt(const SkBitmap& bitmap,
                                int x, int y,
                                const SkPaint& paint) {
-  drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y), &paint);
+  canvas_->drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y), &paint);
 }
 
 void CanvasSkia::DrawBitmapInt(const SkBitmap& bitmap,
                                int src_x, int src_y, int src_w, int src_h,
                                int dest_x, int dest_y, int dest_w, int dest_h,
                                bool filter) {
   SkPaint p;
   DrawBitmapInt(bitmap, src_x, src_y, src_w, src_h, dest_x, dest_y,
                 dest_w, dest_h, filter, p);
 }
@@ skipping 15 matching lines @@
 
   SkRect dest_rect = { SkIntToScalar(dest_x),
                        SkIntToScalar(dest_y),
                        SkIntToScalar(dest_x + dest_w),
                        SkIntToScalar(dest_y + dest_h) };
 
   if (src_w == dest_w && src_h == dest_h) {
     // Workaround for apparent bug in Skia that causes image to occasionally
     // shift.
     SkIRect src_rect = { src_x, src_y, src_x + src_w, src_y + src_h };
-    drawBitmapRect(bitmap, &src_rect, dest_rect, &paint);
+    canvas_->drawBitmapRect(bitmap, &src_rect, dest_rect, &paint);
     return;
   }
 
   // Make a bitmap shader that contains the bitmap we want to draw. This is
   // basically what SkCanvas.drawBitmap does internally, but it gives us
   // more control over quality and will use the mipmap in the source image if
   // it has one, whereas drawBitmap won't.
   SkShader* shader = SkShader::CreateBitmapShader(bitmap,
                                                   SkShader::kRepeat_TileMode,
                                                   SkShader::kRepeat_TileMode);
   SkMatrix shader_scale;
   shader_scale.setScale(SkFloatToScalar(static_cast<float>(dest_w) / src_w),
                         SkFloatToScalar(static_cast<float>(dest_h) / src_h));
   shader_scale.preTranslate(SkIntToScalar(-src_x), SkIntToScalar(-src_y));
   shader_scale.postTranslate(SkIntToScalar(dest_x), SkIntToScalar(dest_y));
   shader->setLocalMatrix(shader_scale);
 
   // Set up our paint to use the shader & release our reference (now just owned
   // by the paint).
   SkPaint p(paint);
   p.setFilterBitmap(filter);
   p.setShader(shader);
   shader->unref();
 
   // The rect will be filled by the bitmap.
-  drawRect(dest_rect, p);
+  canvas_->drawRect(dest_rect, p);
 }
 
 void CanvasSkia::DrawStringInt(const string16& text,
                                const gfx::Font& font,
                                const SkColor& color,
                                int x, int y, int w, int h) {
   DrawStringInt(text, font, color, x, y, w, h,
                 gfx::CanvasSkia::DefaultCanvasTextAlignment());
 }
 
@@ skipping 20 matching lines @@
 
   SkShader* shader = SkShader::CreateBitmapShader(bitmap,
                                                   SkShader::kRepeat_TileMode,
                                                   SkShader::kRepeat_TileMode);
   paint.setShader(shader);
   paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
 
   // CreateBitmapShader returns a Shader with a reference count of one, we
   // need to unref after paint takes ownership of the shader.
   shader->unref();
-  save();
-  translate(SkIntToScalar(dest_x - src_x), SkIntToScalar(dest_y - src_y));
+  canvas_->save();
+  canvas_->translate(SkIntToScalar(dest_x - src_x),
+                     SkIntToScalar(dest_y - src_y));
   ClipRectInt(src_x, src_y, w, h);
-  drawPaint(paint);
-  restore();
+  canvas_->drawPaint(paint);
+  canvas_->restore();
 }
 
 gfx::NativeDrawingContext CanvasSkia::BeginPlatformPaint() {
-  return skia::BeginPlatformPaint(this);
+  return skia::BeginPlatformPaint(canvas_);
 }
 
 void CanvasSkia::EndPlatformPaint() {
-  skia::EndPlatformPaint(this);
+  skia::EndPlatformPaint(canvas_);
 }
 
 #if !defined(OS_MACOSX)
 void CanvasSkia::Transform(const ui::Transform& transform) {
-  concat(transform.matrix());
+  canvas_->concat(transform.matrix());
 }
 #endif
 
 CanvasSkia* CanvasSkia::AsCanvasSkia() {
   return this;
 }
 
 const CanvasSkia* CanvasSkia::AsCanvasSkia() const {
   return this;
 }
 
+SkCanvas* CanvasSkia::GetSkCanvas() {
+  return canvas_;
+}
+
+const SkCanvas* CanvasSkia::GetSkCanvas() const {
+  return canvas_;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // CanvasSkia, private:
 
 bool CanvasSkia::IntersectsClipRectInt(int x, int y, int w, int h) {
   SkRect clip;
-  return getClipBounds(&clip) &&
+  return canvas_->getClipBounds(&clip) &&
       clip.intersect(SkIntToScalar(x), SkIntToScalar(y), SkIntToScalar(x + w),
                      SkIntToScalar(y + h));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Canvas, public:
 
 Canvas* Canvas::CreateCanvas() {
   return new CanvasSkia;
 }
@@ skipping 25 matching lines @@
 
 CanvasPaint* CanvasPaint::CreateCanvasPaint(gfx::NativeView view) {
 #if defined(OS_WIN) && !defined(USE_AURA)
   return new CanvasPaintWin(view);
 #else
   return NULL;
 #endif
 }
 
 }  // namespace gfx