ui/gfx: Fix the file names of "canvas_skia_*" to say just "canvas_platform".

BUG=116572
R=asvitkine@chromium.org
TBR=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9719018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@127369 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 378 insertions, 0 deletions

diff --git a/ui/gfx/canvas.cc b/ui/gfx/canvas.cc
new file mode 100644
index 0000000..68087ba
--- /dev/null
+++ b/ui/gfx/canvas.cc
@@ -0,0 +1,378 @@
+// Copyright (c) 2012 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.h"
+
+#include <limits>
+
+#include "base/i18n/rtl.h"
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "third_party/skia/include/effects/SkGradientShader.h"
+#include "ui/gfx/brush.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/font.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/skia_util.h"
+#include "ui/gfx/transform.h"
+
+#if defined(OS_WIN)
+#include "ui/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 {
+
+Canvas::Canvas(const gfx::Size& size, bool is_opaque)
+    : owned_canvas_(new skia::PlatformCanvas(size.width(), size.height(),
+                                             is_opaque)),
+      canvas_(owned_canvas_.get()) {
+#if defined(OS_WIN) || defined(OS_MACOSX)
+  // skia::PlatformCanvas instances are initialized to 0 by Cairo on Linux, but
+  // uninitialized on Win and Mac.
+  if (!is_opaque)
+    owned_canvas_->clear(SkColorSetARGB(0, 0, 0, 0));
+#endif
+}
+
+Canvas::Canvas(const SkBitmap& bitmap, bool is_opaque)
+    : owned_canvas_(new skia::PlatformCanvas(bitmap.width(), bitmap.height(),
+                                             is_opaque)),
+      canvas_(owned_canvas_.get()) {
+  DrawBitmapInt(bitmap, 0, 0);
+}
+
+Canvas::Canvas()
+    : owned_canvas_(new skia::PlatformCanvas()),
+      canvas_(owned_canvas_.get()) {
+}
+
+Canvas::Canvas(SkCanvas* canvas)
+    : owned_canvas_(),
+      canvas_(canvas) {
+  DCHECK(canvas);
+}
+
+Canvas::~Canvas() {
+}
+
+// static
+int Canvas::GetStringWidth(const string16& text, const gfx::Font& font) {
+  int width = 0, height = 0;
+  Canvas::SizeStringInt(text, font, &width, &height, NO_ELLIPSIS);
+  return width;
+}
+
+// static
+int Canvas::DefaultCanvasTextAlignment() {
+  return base::i18n::IsRTL() ? TEXT_ALIGN_RIGHT : TEXT_ALIGN_LEFT;
+}
+
+SkBitmap Canvas::ExtractBitmap() const {
+  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;
+}
+
+void Canvas::DrawDashedRect(const gfx::Rect& rect, SkColor color) {
+  // 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 SkColor last_color;
+  static SkBitmap* dots = NULL;
+  if (!dots || last_color != color) {
+    int col_pixels = 32;
+    int row_pixels = 32;
+
+    delete dots;
+    last_color = color;
+    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] = color;
+        }
+      }
+    }
+  }
+
+  // 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();
+
+  DrawRect(gfx::Rect(rect.x(), rect.y(), rect.width(), 1), paint);
+  DrawRect(gfx::Rect(rect.x(), rect.y() + rect.height() - 1, rect.width(), 1),
+           paint);
+  DrawRect(gfx::Rect(rect.x(), rect.y(), 1, rect.height()), paint);
+  DrawRect(gfx::Rect(rect.x() + rect.width() - 1, rect.y(), 1, rect.height()),
+           paint);
+}
+
+void Canvas::Save() {
+  canvas_->save();
+}
+
+void Canvas::SaveLayerAlpha(uint8 alpha) {
+  canvas_->saveLayerAlpha(NULL, alpha);
+}
+
+
+void Canvas::SaveLayerAlpha(uint8 alpha, const gfx::Rect& layer_bounds) {
+  SkRect bounds(gfx::RectToSkRect(layer_bounds));
+  canvas_->saveLayerAlpha(&bounds, alpha);
+}
+
+void Canvas::Restore() {
+  canvas_->restore();
+}
+
+bool Canvas::ClipRect(const gfx::Rect& rect) {
+  return canvas_->clipRect(gfx::RectToSkRect(rect));
+}
+
+void Canvas::Translate(const gfx::Point& point) {
+  canvas_->translate(SkIntToScalar(point.x()), SkIntToScalar(point.y()));
+}
+
+void Canvas::Scale(int x_scale, int y_scale) {
+  canvas_->scale(SkIntToScalar(x_scale), SkIntToScalar(y_scale));
+}
+
+void Canvas::FillRect(const gfx::Rect& rect, const SkColor& color) {
+  FillRect(rect, color, SkXfermode::kSrcOver_Mode);
+}
+
+void Canvas::FillRect(const gfx::Rect& rect,
+                      const SkColor& color,
+                      SkXfermode::Mode mode) {
+  SkPaint paint;
+  paint.setColor(color);
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setXfermodeMode(mode);
+  DrawRect(rect, paint);
+}
+
+void Canvas::FillRect(const gfx::Rect& rect, const gfx::Brush* brush) {
+  const SkiaShader* shader = static_cast<const SkiaShader*>(brush);
+  SkPaint paint;
+  paint.setShader(shader->shader());
+  // TODO(beng): set shader transform to match canvas transform.
+  DrawRect(rect, paint);
+}
+
+void Canvas::DrawRect(const gfx::Rect& rect, const SkColor& color) {
+  DrawRect(rect, color, SkXfermode::kSrcOver_Mode);
+}
+
+void Canvas::DrawRect(const gfx::Rect& rect,
+                      const SkColor& color,
+                      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);
+
+  DrawRect(rect, paint);
+}
+
+void Canvas::DrawRect(const gfx::Rect& rect, const SkPaint& paint) {
+  canvas_->drawIRect(RectToSkIRect(rect), paint);
+}
+
+void Canvas::DrawLine(const gfx::Point& p1,
+                      const gfx::Point& p2,
+                      const SkColor& color) {
+  SkPaint paint;
+  paint.setColor(color);
+  paint.setStrokeWidth(SkIntToScalar(1));
+  canvas_->drawLine(SkIntToScalar(p1.x()), SkIntToScalar(p1.y()),
+                    SkIntToScalar(p2.x()), SkIntToScalar(p2.y()), paint);
+}
+
+void Canvas::DrawFocusRect(const gfx::Rect& rect) {
+  DrawDashedRect(rect, SK_ColorGRAY);
+}
+
+void Canvas::DrawBitmapInt(const SkBitmap& bitmap, int x, int y) {
+  canvas_->drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y));
+}
+
+void Canvas::DrawBitmapInt(const SkBitmap& bitmap,
+                           int x, int y,
+                           const SkPaint& paint) {
+  canvas_->drawBitmap(bitmap, SkIntToScalar(x), SkIntToScalar(y), &paint);
+}
+
+void Canvas::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 Canvas::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) {
+    NOTREACHED() << "Attempting to draw bitmap 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 };
+    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.
+  canvas_->drawRect(dest_rect, p);
+}
+
+void Canvas::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, DefaultCanvasTextAlignment());
+}
+
+void Canvas::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 Canvas::TileImageInt(const SkBitmap& bitmap,
+                          int x, int y, int w, int h) {
+  TileImageInt(bitmap, 0, 0, x, y, w, h);
+}
+
+void Canvas::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();
+  canvas_->save();
+  canvas_->translate(SkIntToScalar(dest_x - src_x),
+                     SkIntToScalar(dest_y - src_y));
+  ClipRect(gfx::Rect(src_x, src_y, w, h));
+  canvas_->drawPaint(paint);
+  canvas_->restore();
+}
+
+gfx::NativeDrawingContext Canvas::BeginPlatformPaint() {
+  return skia::BeginPlatformPaint(canvas_);
+}
+
+void Canvas::EndPlatformPaint() {
+  skia::EndPlatformPaint(canvas_);
+}
+
+void Canvas::Transform(const ui::Transform& transform) {
+  canvas_->concat(transform.matrix());
+}
+
+bool Canvas::IntersectsClipRectInt(int x, int y, int w, int h) {
+  SkRect clip;
+  return canvas_->getClipBounds(&clip) &&
+      clip.intersect(SkIntToScalar(x), SkIntToScalar(y), SkIntToScalar(x + w),
+                     SkIntToScalar(y + h));
+}
+
+}  // namespace gfx