content/renderer/browser_plugin/browser_plugin_backing_store.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/browser_plugin/browser_plugin_backing_store.h"
   6
   7 #include "ui/gfx/canvas.h"
   8 #include "ui/gfx/rect.h"
   9 #include "ui/gfx/rect_conversions.h"
  10 #include "ui/gfx/size_conversions.h"
  11 #include "ui/gfx/vector2d_conversions.h"
  12 #include "ui/surface/transport_dib.h"
  13
  14 namespace content {
  15
  16 // Max height and width for layers
  17 static const int kMaxSize = 23170;
  18
  19 BrowserPluginBackingStore::BrowserPluginBackingStore(
  20     const gfx::Size& size,
  21     float scale_factor)
  22     : size_(size),
  23       scale_factor_(scale_factor) {
  24   gfx::Size pixel_size = gfx::ToFlooredSize(gfx::ScaleSize(size, scale_factor));
  25   bitmap_.setConfig(SkBitmap::kARGB_8888_Config,
  26       pixel_size.width(), pixel_size.height());
  27   bitmap_.allocPixels();
  28   canvas_.reset(new SkCanvas(bitmap_));
  29 }
  30
  31 BrowserPluginBackingStore::~BrowserPluginBackingStore() {
  32 }
  33
  34 void BrowserPluginBackingStore::PaintToBackingStore(
  35     const gfx::Rect& bitmap_rect,
  36     const std::vector<gfx::Rect>& copy_rects,
  37     TransportDIB* dib) {
  38   if (bitmap_rect.IsEmpty())
  39     return;
  40
  41   gfx::Rect pixel_bitmap_rect = gfx::ToFlooredRectDeprecated(
  42       gfx::ScaleRect(bitmap_rect, scale_factor_));
  43
  44   const int width = pixel_bitmap_rect.width();
  45   const int height = pixel_bitmap_rect.height();
  46
  47   if (width <= 0 || width > kMaxSize ||
  48       height <= 0 || height > kMaxSize)
  49     return;
  50
  51   if (!dib)
  52     return;
  53
  54   SkPaint copy_paint;
  55   copy_paint.setXfermodeMode(SkXfermode::kSrc_Mode);
  56
  57   SkBitmap sk_bitmap;
  58   sk_bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
  59   sk_bitmap.setPixels(dib->memory());
  60   for (size_t i = 0; i < copy_rects.size(); i++) {
  61     const gfx::Rect& pixel_copy_rect = gfx::ToEnclosingRect(
  62         gfx::ScaleRect(copy_rects[i], scale_factor_));
  63     int x = pixel_copy_rect.x() - pixel_bitmap_rect.x();
  64     int y = pixel_copy_rect.y() - pixel_bitmap_rect.y();
  65     SkIRect srcrect = SkIRect::MakeXYWH(x, y,
  66         pixel_copy_rect.width(),
  67         pixel_copy_rect.height());
  68
  69     SkRect dstrect = SkRect::MakeXYWH(
  70         SkIntToScalar(pixel_copy_rect.x()),
  71         SkIntToScalar(pixel_copy_rect.y()),
  72         SkIntToScalar(pixel_copy_rect.width()),
  73         SkIntToScalar(pixel_copy_rect.height()));
  74     canvas_.get()->drawBitmapRect(sk_bitmap, &srcrect, dstrect, &copy_paint);
  75   }
  76 }
  77
  78 void BrowserPluginBackingStore::ScrollBackingStore(
  79     const gfx::Vector2d& delta,
  80     const gfx::Rect& clip_rect,
  81     const gfx::Size& view_size) {
  82   gfx::Rect pixel_rect = gfx::ToEnclosingRect(
  83       gfx::ScaleRect(clip_rect, scale_factor_));
  84   gfx::Vector2d pixel_delta = gfx::ToFlooredVector2d(
  85       gfx::ScaleVector2d(delta, scale_factor_));
  86
  87   int x = std::min(pixel_rect.x(), pixel_rect.x() - pixel_delta.x());
  88   int y = std::min(pixel_rect.y(), pixel_rect.y() - pixel_delta.y());
  89   int w = pixel_rect.width() + abs(pixel_delta.x());
  90   int h = pixel_rect.height() + abs(pixel_delta.y());
  91   SkIRect rect = SkIRect::MakeXYWH(x, y, w, h);
  92   bitmap_.scrollRect(&rect, pixel_delta.x(), pixel_delta.y());
  93 }
  94
  95 void BrowserPluginBackingStore::Clear(SkColor clear_color) {
  96   canvas_->clear(clear_color);
  97 }
  98
  99 }  // namespace content