Add PlatformPictureSkia and RecordingPlatformDeviceSkia.

skia/ext/recording_platform_device_skia.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 "skia/ext/recording_platform_device_skia.h"
+
+#include "skia/ext/platform_canvas.h"
+#include "third_party/skia/include/core/SkClipStack.h"
+#include "third_party/skia/include/core/SkDraw.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkRect.h"
+#include "third_party/skia/include/core/SkRegion.h"
+#include "third_party/skia/include/core/SkScalar.h"
+
+namespace skia {
+
+SkDevice* CreateRecordingPlatformDeviceSkia(
+    SkPicture* picture, int width, int height) {
+  SkBitmap bm;
+  bm.setConfig(SkBitmap::kNo_Config, width, height);
+  return new RecordingPlatformDeviceSkia(bm, picture);
+}
+
+RecordingPlatformDeviceSkia::RecordingPlatformDeviceSkia(
+    const SkBitmap& bitmap, SkPicture* picture)
+    : SkDevice(bitmap),
+      picture_(picture) {
+  SetPlatformDevice(this, this);
+}
+
+RecordingPlatformDeviceSkia::~RecordingPlatformDeviceSkia() {
+}
+
+bool RecordingPlatformDeviceSkia::SupportsPlatformPaint() {
+  return true;
+}
+
+bool RecordingPlatformDeviceSkia::SupportsDirectPlatformPaint() {
+  return false;
+}
+
+PlatformSurface RecordingPlatformDeviceSkia::BeginPlatformPaint() {
+  // Even when recording drawing commands of the page, we have to
+  // provide a raster surface for plugins to render into. Therefore we
+  // create a BitmapPlatformDevice here and return the context from it,
+  // then layer on the raster data as an image in EndPlatformPaint.
+  SkASSERT(raster_canvas_ == NULL);
+  raster_canvas_ = CreateBitmapCanvas(width(), height(), false);
+  raster_canvas_->unref();  // SkRefPtr and create both took a reference.
+
+  // Copy picture and playback to raster surface.

[reed1, 2012/09/20 13:42:28]

you're right about needing to copy so we can continue to record. Lets say that
here in the comment.
// We make a copy so that our original picture_ can continue to record. Normally
if you "draw" a picture, that forces its recording to stop.

[reveman, 2012/09/20 17:01:26]

sure.

+  SkPicture raster_picture(*picture_);
+  raster_canvas_->drawPicture(raster_picture);
+  // Save the effect of all currently recorded matrix operations.
+  raster_matrix_ = raster_canvas_->getTotalMatrix();
+
+  return skia::BeginPlatformPaint(raster_canvas_.get());
+}
+
+void RecordingPlatformDeviceSkia::EndPlatformPaint() {
+  SkASSERT(raster_canvas_ != NULL);
+  SkMatrix inverse;
+  // To add a drawing command that will render the raster surface at the
+  // correct origin we need to revert the effect of all currently
+  // recorded matrix operations.
+  if (raster_matrix_.invert(&inverse)) {
+    SkCanvas* canvas = picture_->getRecordingCanvas();
+    SkASSERT(canvas != NULL);
+    canvas->save();
+    canvas->concat(inverse);
+    SkPaint paint;
+    paint.setXfermodeMode(SkXfermode::kSrc_Mode);
+    // TODO(reveman): Need to mark bitmap as being "immutable" before
+    // calling drawBitmap to avoid having the picture recording code do
+    // a deep-copy of it.
+    canvas->drawBitmap(
+        raster_canvas_->getDevice()->accessBitmap(false), 0, 0, &paint);
+    canvas->restore();
+  }
+  skia::EndPlatformPaint(raster_canvas_.get());
+  raster_canvas_ = NULL;
+}
+
+#if defined(OS_WIN)
+void RecordingPlatformDeviceSkia::DrawToNativeContext(
+    HDC dc, int x, int y, const RECT* src_rect) {
+  SkASSERT(false);
+}
+#elif defined(OS_MACOSX)
+void RecordingPlatformDeviceSkia::DrawToNativeContext(
+    CGContext* context, int x, int y, const CGRect* src_rect) {
+  SkASSERT(false);
+}
+
+CGContextRef RecordingPlatformDeviceSkia::GetBitmapContext() {
+  SkASSERT(false);
+  return NULL;
+}
+#elif defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_OPENBSD)
+void RecordingPlatformDeviceSkia::DrawToNativeContext(
+    PlatformSurface surface, int x, int y, const PlatformRect* src_rect) {
+  // Should never be called on Linux.
+  SkASSERT(false);
+}
+#endif
+
+}  // namespace skia