skia/ext/vector_platform_device_skia.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 "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