Browser Plugin: New Implementation (Renderer Side)

content/renderer/browser_plugin/browser_plugin_backing_store.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 "content/renderer/browser_plugin/browser_plugin_backing_store.h"
+
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/rect.h"
+#include "ui/surface/transport_dib.h"
+
+// Max height and width for layers
+static const int kMaxSize = 23170;
+
+BrowserPluginBackingStore::BrowserPluginBackingStore(
+    const gfx::Size& size,
+    float scale_factor)
+    : size_(size),
+      scale_factor_(scale_factor) {
+  gfx::Size pixel_size = size.Scale(scale_factor);
+  bitmap_.setConfig(SkBitmap::kARGB_8888_Config,
+      pixel_size.width(), pixel_size.height());
+  bitmap_.allocPixels();
+  canvas_.reset(new SkCanvas(bitmap_));
+}
+
+BrowserPluginBackingStore::~BrowserPluginBackingStore() {
+}
+
+void BrowserPluginBackingStore::PaintToBackingStore(
+    const gfx::Rect& bitmap_rect,
+    const std::vector<gfx::Rect>& copy_rects,
+    TransportDIB* dib) {
+  if (bitmap_rect.IsEmpty())
+    return;
+
+  gfx::Rect pixel_bitmap_rect = bitmap_rect.Scale(scale_factor_);
+
+  const int width = pixel_bitmap_rect.width();
+  const int height = pixel_bitmap_rect.height();
+
+  if (width <= 0 || width > kMaxSize ||
+      height <= 0 || height > kMaxSize)
+    return;
+
+  if (!dib)
+    return;
+
+  SkPaint copy_paint;
+  copy_paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+
+  SkBitmap sk_bitmap;
+  sk_bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
+  sk_bitmap.setPixels(dib->memory());
+  for (size_t i = 0; i < copy_rects.size(); i++) {
+    const gfx::Rect& pixel_copy_rect = copy_rects[i].Scale(scale_factor_);
+    int x = pixel_copy_rect.x() - pixel_bitmap_rect.x();
+    int y = pixel_copy_rect.y() - pixel_bitmap_rect.y();
+    SkIRect srcrect = SkIRect::MakeXYWH(x, y,
+        pixel_copy_rect.width(),
+        pixel_copy_rect.height());
+
+    SkRect dstrect = SkRect::MakeXYWH(
+        SkIntToScalar(pixel_copy_rect.x()),
+        SkIntToScalar(pixel_copy_rect.y()),
+        SkIntToScalar(pixel_copy_rect.width()),
+        SkIntToScalar(pixel_copy_rect.height()));
+    canvas_.get()->drawBitmapRect(sk_bitmap, &srcrect, dstrect, &copy_paint);
+  }
+}
+
+void BrowserPluginBackingStore::ScrollBackingStore(
+    int dx,
+    int dy,
+    const gfx::Rect& clip_rect,
+    const gfx::Size& view_size) {
+  gfx::Rect pixel_rect = clip_rect.Scale(scale_factor_);
+  int pixel_dx = dx * scale_factor_;
+  int pixel_dy = dy * scale_factor_;
+
+  int x = std::min(pixel_rect.x(), pixel_rect.x() - pixel_dx);
+  int y = std::min(pixel_rect.y(), pixel_rect.y() - pixel_dy);
+  int w = pixel_rect.width() + abs(pixel_dx);
+  int h = pixel_rect.height() + abs(pixel_dy);
+  SkIRect rect = SkIRect::MakeXYWH(x, y, w, h);
+  bitmap_.scrollRect(&rect, pixel_dx, pixel_dy);
+}