Expose array of bitmaps contained by gfx::Image similar to NSImage

ui/gfx/canvas.cc

 // 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"
@@ skipping 260 matching lines @@
   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) {
+  DrawBitmapFloat(bitmap, static_cast<float>(src_x), static_cast<float>(src_y),
+                  static_cast<float>(src_w), static_cast<float>(src_h),
+                  static_cast<float>(dest_x), static_cast<float>(dest_y),
+                  static_cast<float>(dest_w), static_cast<float>(dest_h),
+                  filter, paint);
+}
+
+void Canvas::DrawBitmapFloat(const SkBitmap& bitmap,
+    float src_x, float src_y, float src_w, float src_h,
+    float dest_x, float dest_y, float dest_w, float 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) };
+  SkRect dest_rect = { SkFloatToScalar(dest_x),
+                       SkFloatToScalar(dest_y),
+                       SkFloatToScalar(dest_x + dest_w),
+                       SkFloatToScalar(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_scale.setScale(SkFloatToScalar(dest_w / src_w),
+                        SkFloatToScalar(dest_h / src_h));
+  shader_scale.preTranslate(SkFloatToScalar(-src_x), SkFloatToScalar(-src_y));
+  shader_scale.postTranslate(SkFloatToScalar(dest_x), SkFloatToScalar(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.
@@ skipping 76 matching lines @@
       clip.intersect(SkIntToScalar(x), SkIntToScalar(y), SkIntToScalar(x + w),
                      SkIntToScalar(y + h));
 }
 
 bool Canvas::IntersectsClipRect(const gfx::Rect& rect) {
   return IntersectsClipRectInt(rect.x(), rect.y(),
                                rect.width(), rect.height());
 }
 
 }  // namespace gfx