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 {
+
+RecordingPlatformDeviceSkia::RecordingPlatformDeviceSkia(
+    const SkBitmap& bitmap, SkPicture* picture)
+    : SkDevice(bitmap),
+      raster_canvas_(NULL),
+      picture_(picture) {
+  SetPlatformDevice(this, this);
+}
+
+RecordingPlatformDeviceSkia::~RecordingPlatformDeviceSkia() {
+  if (raster_canvas_)
+    raster_canvas_->unref();
+}
+
+RecordingPlatformDeviceSkia* RecordingPlatformDeviceSkia::Create(
+    SkPicture* picture, int width, int height) {
+  SkBitmap bm;
+  bm.setConfig(SkBitmap::kNo_Config, width, height);
+  return new RecordingPlatformDeviceSkia(bm, picture);
+}
+
+PlatformDevice::PlatformPaint RecordingPlatformDeviceSkia::
+    PlatformPaintSupport() {
+  return PLATFORM_PAINT_INDIRECT;
+}
+
+PlatformSurface RecordingPlatformDeviceSkia::BeginPlatformPaint() {
+  SkASSERT(raster_canvas_ == NULL);
+
+  SkCanvas* canvas = picture_->getRecordingCanvas();
+  SkASSERT(canvas != NULL);
+
+  SkIRect clip;
+  if (!canvas->getClipDeviceBounds(&clip)) {
+    raster_canvas_ = CreateBitmapCanvas(1, 1, false);
+    return skia::BeginPlatformPaint(raster_canvas_);
+  }
+
+  // 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.
+  raster_canvas_ = CreateBitmapCanvas(clip.fRight - clip.fLeft,
+                                      clip.fBottom - clip.fTop,
+                                      false);
+  raster_canvas_->translate(-clip.fLeft, -clip.fTop);
+
+  // 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.
+  SkPicture raster_picture(*picture_);
+  raster_canvas_->drawPicture(raster_picture);
+
+  return skia::BeginPlatformPaint(raster_canvas_);
+}
+
+void RecordingPlatformDeviceSkia::EndPlatformPaint() {
+  SkASSERT(raster_canvas_ != NULL);
+
+  SkCanvas* canvas = picture_->getRecordingCanvas();
+  SkASSERT(canvas != NULL);
+
+  SkMatrix matrix = canvas->getTotalMatrix();
+  SkMatrix inverse;
+  SkIRect clip;
+  // 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 (canvas->getClipDeviceBounds(&clip) && matrix.invert(&inverse)) {
+    canvas->save();
+    canvas->concat(inverse);
+    canvas->translate(clip.fLeft, clip.fTop);
+    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_);
+  raster_canvas_->unref();
+  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