1 files changed, 391 insertions, 0 deletions
diff --git a/ui/gfx/canvas_skia.cc b/ui/gfx/canvas_skia.cc
new file mode 100644
index 0000000..aa0cb9d
--- /dev/null
+++ b/ui/gfx/canvas_skia.cc
@@ -0,0 +1,391 @@
+// Copyright (c) 2010 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 "gfx/canvas_skia.h"
+
+#include <limits>
+
+#include "base/i18n/rtl.h"
+#include "base/logging.h"
+#include "gfx/brush.h"
+#include "gfx/font.h"
+#include "gfx/rect.h"
+#include "third_party/skia/include/effects/SkGradientShader.h"
+
+#if defined(OS_WIN)
+#include "gfx/canvas_skia_paint.h"
+#endif
+
+namespace {
+
+// A platform wrapper for a Skia shader that makes sure the underlying
+// SkShader object is unref'ed when this object is destroyed.
+class SkiaShader : public gfx::Brush {
+ public:
+  explicit SkiaShader(SkShader* shader) : shader_(shader) {
+  }
+  virtual ~SkiaShader() {
+    shader_->unref();
+  }
+
+  // Accessor for shader, so it can be associated with a SkPaint.
+  SkShader* shader() const { return shader_; }
+
+ private:
+  SkShader* shader_;
+
+  DISALLOW_COPY_AND_ASSIGN(SkiaShader);
+};
+
+
+}  // namespace
+
+namespace gfx {
+
+////////////////////////////////////////////////////////////////////////////////
+// CanvasSkia, public:
+
+// 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);
+
+  // 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();
+}
+
+void CanvasSkia::SaveLayerAlpha(uint8 alpha) {
+  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);
+}
+
+void CanvasSkia::Restore() {
+  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);
+}
+
+void CanvasSkia::TranslateInt(int x, int y) {
+  translate(SkIntToScalar(x), SkIntToScalar(y));
+}
+
+void CanvasSkia::ScaleInt(int x, int y) {
+  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;
+  paint.setColor(color);
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setXfermodeMode(mode);
+  DrawRectInt(x, y, w, h, paint);
+}
+
+void CanvasSkia::FillRectInt(const gfx::Brush* brush,
+                             int x, int y, int w, int h) {
+  const SkiaShader* shader = static_cast<const SkiaShader*>(brush);
+  SkPaint paint;
+  paint.setShader(shader->shader());
+  // TODO(beng): set shader transform to match canvas transform.
+  DrawRectInt(x, y, w, h, paint);
+}
+
+void CanvasSkia::DrawRectInt(const SkColor& color, int x, int y, int w, int h) {
+  DrawRectInt(color, x, y, w, h, SkXfermode::kSrcOver_Mode);
+}
+
+void CanvasSkia::DrawRectInt(const SkColor& color,
+                             int x, int y, int w, int h,
+                             SkXfermode::Mode mode) {
+  SkPaint paint;
+  paint.setColor(color);
+  paint.setStyle(SkPaint::kStroke_Style);
+  // Set a stroke width of 0, which will put us down the stroke rect path.  If
+  // 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);
+}
+
+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);
+}
+
+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;
+    int row_pixels = 32;
+
+    dots = new SkBitmap;
+    dots->setConfig(SkBitmap::kARGB_8888_Config, col_pixels, row_pixels);
+    dots->allocPixels();
+    dots->eraseARGB(0, 0, 0, 0);
+
+    uint32_t* dot = dots->getAddr32(0, 0);
+    for (int i = 0; i < row_pixels; i++) {
+      for (int u = 0; u < col_pixels; u++) {
+        if ((u % 2 + i % 2) % 2 != 0) {
+          dot[i * row_pixels + u] = SK_ColorGRAY;
+        }
+      }
+    }
+  }
+
+  // First the horizontal lines.
+
+  // Make a shader for the bitmap with an origin of the box we'll draw. This
+  // shader is refcounted and will have an initial refcount of 1.
+  SkShader* shader = SkShader::CreateBitmapShader(
+      *dots, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
+  // Assign the shader to the paint & release our reference. The paint will
+  // now own the shader and the shader will be destroyed when the paint goes
+  // out of scope.
+  SkPaint paint;
+  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));
+}
+
+void CanvasSkia::DrawBitmapInt(const SkBitmap& bitmap,
+                               int x, int y,
+                               const SkPaint& paint) {
+  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);
+}
+
+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,
+                               const SkPaint& paint) {
+  DLOG_ASSERT(src_x + src_w < std::numeric_limits<int16_t>::max() &&
+              src_y + src_h < std::numeric_limits<int16_t>::max());
+  if (src_w <= 0 || src_h <= 0 || dest_w <= 0 || dest_h <= 0) {
+    NOTREACHED() << "Attempting to draw bitmap to/from an empty rect!";
+    return;
+  }
+
+  if (!IntersectsClipRectInt(dest_x, dest_y, dest_w, dest_h))
+    return;
+
+  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);
+    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);
+}
+
+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());
+}
+
+void CanvasSkia::DrawStringInt(const string16& text,
+                               const gfx::Font& font,
+                               const SkColor& color,
+                               const gfx::Rect& display_rect) {
+  DrawStringInt(text, font, color, display_rect.x(), display_rect.y(),
+                display_rect.width(), display_rect.height());
+}
+
+void CanvasSkia::TileImageInt(const SkBitmap& bitmap,
+                              int x, int y, int w, int h) {
+  TileImageInt(bitmap, 0, 0, x, y, w, h);
+}
+
+void CanvasSkia::TileImageInt(const SkBitmap& bitmap,
+                              int src_x, int src_y,
+                              int dest_x, int dest_y, int w, int h) {
+  if (!IntersectsClipRectInt(dest_x, dest_y, w, h))
+    return;
+
+  SkPaint paint;
+
+  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));
+  ClipRectInt(src_x, src_y, w, h);
+  drawPaint(paint);
+  restore();
+}
+
+gfx::NativeDrawingContext CanvasSkia::BeginPlatformPaint() {
+  return beginPlatformPaint();
+}
+
+void CanvasSkia::EndPlatformPaint() {
+  endPlatformPaint();
+}
+
+CanvasSkia* CanvasSkia::AsCanvasSkia() {
+  return this;
+}
+
+const CanvasSkia* CanvasSkia::AsCanvasSkia() const {
+  return this;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// CanvasSkia, private:
+
+bool CanvasSkia::IntersectsClipRectInt(int x, int y, int w, int h) {
+  SkRect clip;
+  return getClipBounds(&clip) &&
+      clip.intersect(SkIntToScalar(x), SkIntToScalar(y), SkIntToScalar(x + w),
+                     SkIntToScalar(y + h));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Canvas, public:
+
+Canvas* Canvas::CreateCanvas() {
+  return new CanvasSkia;
+}
+
+Canvas* Canvas::CreateCanvas(int width, int height, bool is_opaque) {
+  return new CanvasSkia(width, height, is_opaque);
+}
+
+#if defined(OS_WIN)
+// TODO(beng): move to canvas_win.cc, etc.
+class CanvasPaintWin : public CanvasSkiaPaint, public CanvasPaint {
+ public:
+  CanvasPaintWin(gfx::NativeView view) : CanvasSkiaPaint(view) {}
+
+  // Overridden from CanvasPaint2:
+  virtual bool IsValid() const {
+    return isEmpty();
+  }
+
+  virtual gfx::Rect GetInvalidRect() const {
+    return gfx::Rect(paintStruct().rcPaint);
+  }
+
+  virtual Canvas* AsCanvas() {
+    return this;
+  }
+};
+#endif
+
+CanvasPaint* CanvasPaint::CreateCanvasPaint(gfx::NativeView view) {
+#if defined(OS_WIN)
+  return new CanvasPaintWin(view);
+#else
+  return NULL;
+#endif
+}
+
+}  // namespace gfx