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      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 "skia/ext/vector_platform_device_skia.h"
      6 
      7 #include "skia/ext/bitmap_platform_device.h"
      8 #include "third_party/skia/include/core/SkClipStack.h"
      9 #include "third_party/skia/include/core/SkDraw.h"
     10 #include "third_party/skia/include/core/SkRect.h"
     11 #include "third_party/skia/include/core/SkRegion.h"
     12 #include "third_party/skia/include/core/SkScalar.h"
     13 
     14 namespace skia {
     15 
     16 static inline SkBitmap makeABitmap(int width, int height) {
     17   SkBitmap bitmap;
     18   bitmap.setInfo(SkImageInfo::MakeUnknown(width, height));
     19   return bitmap;
     20 }
     21 
     22 VectorPlatformDeviceSkia::VectorPlatformDeviceSkia(
     23     const SkISize& pageSize,
     24     const SkISize& contentSize,
     25     const SkMatrix& initialTransform)
     26     : SkPDFDevice(pageSize, contentSize, initialTransform) {
     27   SetPlatformDevice(this, this);
     28 }
     29 
     30 VectorPlatformDeviceSkia::~VectorPlatformDeviceSkia() {
     31 }
     32 
     33 bool VectorPlatformDeviceSkia::SupportsPlatformPaint() {
     34   return false;
     35 }
     36 
     37 PlatformSurface VectorPlatformDeviceSkia::BeginPlatformPaint() {
     38   // Even when drawing a vector representation of the page, we have to
     39   // provide a raster surface for plugins to render into - they don't have
     40   // a vector interface.  Therefore we create a BitmapPlatformDevice here
     41   // and return the context from it, then layer on the raster data as an
     42   // image in EndPlatformPaint.
     43   DCHECK(raster_surface_ == NULL);
     44   raster_surface_ = skia::AdoptRef(
     45       BitmapPlatformDevice::CreateAndClear(width(), height(), false));
     46   return raster_surface_->BeginPlatformPaint();
     47 }
     48 
     49 void VectorPlatformDeviceSkia::EndPlatformPaint() {
     50   DCHECK(raster_surface_ != NULL);
     51   SkPaint paint;
     52   // SkPDFDevice checks the passed SkDraw for an empty clip (only).  Fake
     53   // it out by setting a non-empty clip.
     54   SkDraw draw;
     55   SkRegion clip(SkIRect::MakeWH(width(), height()));
     56   draw.fClip=&clip;
     57   drawSprite(draw, raster_surface_->accessBitmap(false), 0, 0, paint);
     58   // BitmapPlatformDevice matches begin and end calls.
     59   raster_surface_->EndPlatformPaint();
     60   raster_surface_.clear();
     61 }
     62 
     63 #if defined(OS_WIN)
     64 void VectorPlatformDeviceSkia::DrawToNativeContext(HDC dc,
     65                                                    int x,
     66                                                    int y,
     67                                                    const RECT* src_rect) {
     68   SkASSERT(false);
     69 }
     70 #elif defined(OS_MACOSX)
     71 void VectorPlatformDeviceSkia::DrawToNativeContext(CGContext* context, int x,
     72     int y, const CGRect* src_rect) {
     73   SkASSERT(false);
     74 }
     75 
     76 CGContextRef VectorPlatformDeviceSkia::GetBitmapContext() {
     77   SkASSERT(false);
     78   return NULL;
     79 }
     80 #elif defined(OS_POSIX)
     81 void VectorPlatformDeviceSkia::DrawToNativeContext(
     82     PlatformSurface surface, int x, int y, const PlatformRect* src_rect) {
     83   // Should never be called on Linux.
     84   SkASSERT(false);
     85 }
     86 #endif
     87 
     88 }  // namespace skia
     89