Connect Skia PDF backend to printing subsystem.

skia/ext/vector_platform_device_skia.cc

+// Copyright (c) 2009 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/vector_platform_device_skia.h"
+
+#include "skia/ext/bitmap_platform_device.h"
+#include "third_party/skia/include/core/SkClipStack.h"
+#include "third_party/skia/include/core/SkDraw.h"
+#include "third_party/skia/include/core/SkScalar.h"
+#include "third_party/skia/include/core/SkRegion.h"

[Lei Zhang, 2011/04/06 20:43:56]

nit: SkRegion before SKScalar.

[vandebo (ex-Chrome), 2011/04/06 22:01:37]

Done.

+
+namespace skia {
+
+SkDevice* VectorPlatformDeviceSkiaFactory::newDevice(SkCanvas* noUsed,
+                                                     SkBitmap::Config config,
+                                                     int width, int height,
+                                                     bool isOpaque,
+                                                     bool isForLayer) {
+  SkASSERT(config == SkBitmap::kARGB_8888_Config);
+  SkPDFDevice::OriginTransform flip = SkPDFDevice::kFlip_OriginTransform;
+  if (isForLayer)
+    flip = SkPDFDevice::kNoFlip_OriginTransform;
+  return new VectorPlatformDeviceSkia(width, height, flip);
+}
+
+static inline SkBitmap makeABitmap(int width, int height) {
+  SkBitmap bitmap;
+  bitmap.setConfig(SkBitmap::kNo_Config, width, height);
+  return bitmap;
+}
+
+VectorPlatformDeviceSkia::VectorPlatformDeviceSkia(
+    int width, int height, SkPDFDevice::OriginTransform flip)
+    : PlatformDevice(makeABitmap(width, height)),
+      pdf_device_(new SkPDFDevice(width, height, flip)) {
+  pdf_device_->unref();  // SkRefPtr and new both took a reference.
+  base_transform_.reset();
+}
+
+VectorPlatformDeviceSkia::~VectorPlatformDeviceSkia() {
+}
+
+bool VectorPlatformDeviceSkia::IsVectorial() {
+  return true;
+}
+
+bool VectorPlatformDeviceSkia::IsNativeFontRenderingAllowed() {
+  return false;
+}
+
+PlatformDevice::PlatformSurface VectorPlatformDeviceSkia::beginPlatformPaint() {
+  // Even when drawing a vector representation of the page, we have to
+  // provide a raster surface for plugins to render into - they don't have
+  // a vector interface.  Therefore we create a BitmapPlatformDevice here
+  // and return the context from it, then layer on the raster data as an
+  // image in endPlatformPaint.
+  DCHECK(raster_surface_ == NULL);
+#if defined(OS_WIN)
+  raster_surface_ = BitmapPlatformDevice::create(pdf_device_->width(),
+                                                 pdf_device_->height(),
+                                                 false, /* not opaque */
+                                                 NULL);
+#elif defined(OS_LINUX)
+  raster_surface_ = BitmapPlatformDevice::Create(pdf_device_->width(),
+                                                 pdf_device_->height(),
+                                                 false /* not opaque */);
+#endif
+  raster_surface_->unref();  // SkRefPtr and create both took a reference.
+
+  // Set it to be transparent.
+  SkCanvas canvas(raster_surface_.get());
+  SkPaint transparent;
+  transparent.setColor(SK_ColorBLACK);
+  canvas.drawPaint(transparent);
+  return raster_surface_->beginPlatformPaint();
+}
+
+void VectorPlatformDeviceSkia::endPlatformPaint() {
+  DCHECK(raster_surface_ != NULL);
+  SkPaint paint;
+  pdf_device_->drawSprite(SkDraw(),
+                          raster_surface_->accessBitmap(false),
+                          base_transform_.getTranslateX(),
+                          base_transform_.getTranslateY(),
+                          paint);
+  raster_surface_ = NULL;
+}
+
+SkDeviceFactory* VectorPlatformDeviceSkia::getDeviceFactory() {
+  return SkNEW(VectorPlatformDeviceSkiaFactory);
+}
+
+uint32_t VectorPlatformDeviceSkia::getDeviceCapabilities() {
+  return kVector_Capability;
+}
+
+int VectorPlatformDeviceSkia::width() const {
+  return pdf_device_->width();
+}
+
+int VectorPlatformDeviceSkia::height() const {
+  return pdf_device_->height();
+}
+
+void VectorPlatformDeviceSkia::setMatrixClip(const SkMatrix& matrix,
+                                             const SkRegion& region,
+                                             const SkClipStack& stack) {
+  SkMatrix transform = base_transform_;
+  transform.preConcat(matrix);
+
+  DCHECK(SkMatrix::kTranslate_Mask == base_transform_.getType() ||
+      SkMatrix::kIdentity_Mask == base_transform_.getType());
+  SkRegion clip = region;
+  clip.translate(base_transform_.getTranslateX(),
+                 base_transform_.getTranslateY());
+
+  pdf_device_->setMatrixClip(transform, clip, stack);
+}
+
+bool VectorPlatformDeviceSkia::readPixels(const SkIRect& srcRect,
+                                          SkBitmap* bitmap) {
+  return false;
+}
+
+void VectorPlatformDeviceSkia::drawPaint(const SkDraw& draw,
+                                         const SkPaint& paint) {
+  pdf_device_->drawPaint(draw, paint);
+}
+
+void VectorPlatformDeviceSkia::drawPoints(const SkDraw& draw,
+                                          SkCanvas::PointMode mode,
+                                          size_t count, const SkPoint pts[],
+                                          const SkPaint& paint) {
+  pdf_device_->drawPoints(draw, mode, count, pts, paint);
+}
+
+void VectorPlatformDeviceSkia::drawRect(const SkDraw& draw,
+                                        const SkRect& rect,
+                                        const SkPaint& paint) {
+  pdf_device_->drawRect(draw, rect, paint);
+}
+
+void VectorPlatformDeviceSkia::drawPath(const SkDraw& draw,
+                                        const SkPath& path,
+                                        const SkPaint& paint,
+                                        const SkMatrix* prePathMatrix,
+                                        bool pathIsMutable) {
+  pdf_device_->drawPath(draw, path, paint, prePathMatrix, pathIsMutable);
+}
+
+void VectorPlatformDeviceSkia::drawBitmap(const SkDraw& draw,
+                                          const SkBitmap& bitmap,
+                                          const SkIRect* srcRectOrNull,
+                                          const SkMatrix& matrix,
+                                          const SkPaint& paint) {
+  pdf_device_->drawBitmap(draw, bitmap, srcRectOrNull, matrix, paint);
+}
+
+void VectorPlatformDeviceSkia::drawSprite(const SkDraw& draw,
+                                          const SkBitmap& bitmap,
+                                          int x, int y,
+                                          const SkPaint& paint) {
+  pdf_device_->drawSprite(draw, bitmap, x, y, paint);
+}
+
+void VectorPlatformDeviceSkia::drawText(const SkDraw& draw,
+                                        const void* text,
+                                        size_t byteLength,
+                                        SkScalar x,
+                                        SkScalar y,
+                                        const SkPaint& paint) {
+  pdf_device_->drawText(draw, text, byteLength, x, y, paint);
+}
+
+void VectorPlatformDeviceSkia::drawPosText(const SkDraw& draw,
+                                           const void* text,
+                                           size_t len,
+                                           const SkScalar pos[],
+                                           SkScalar constY,
+                                           int scalarsPerPos,
+                                           const SkPaint& paint) {
+  pdf_device_->drawPosText(draw, text, len, pos, constY, scalarsPerPos, paint);
+}
+
+void VectorPlatformDeviceSkia::drawTextOnPath(const SkDraw& draw,
+                                              const void* text,
+                                              size_t len,
+                                              const SkPath& path,
+                                              const SkMatrix* matrix,
+                                              const SkPaint& paint) {
+  pdf_device_->drawTextOnPath(draw, text, len, path, matrix, paint);
+}
+
+void VectorPlatformDeviceSkia::drawVertices(const SkDraw& draw,
+                                            SkCanvas::VertexMode vmode,
+                                            int vertexCount,
+                                            const SkPoint vertices[],
+                                            const SkPoint texs[],
+                                            const SkColor colors[],
+                                            SkXfermode* xmode,
+                                            const uint16_t indices[],
+                                            int indexCount,
+                                            const SkPaint& paint) {
+  pdf_device_->drawVertices(draw, vmode, vertexCount, vertices, texs, colors,
+                            xmode, indices, indexCount, paint);
+}
+
+void VectorPlatformDeviceSkia::drawDevice(const SkDraw& draw,
+                                          SkDevice* device,
+                                          int x,
+                                          int y,
+                                          const SkPaint& paint) {
+  SkDevice* real_device = device;
+  if ((device->getDeviceCapabilities() & kVector_Capability)) {
+    // Assume that a vectorial device means a VectorPlatformDeviceSkia, we need
+    // to unwrap the embedded SkPDFDevice.
+    VectorPlatformDeviceSkia* vector_device =
+        static_cast<VectorPlatformDeviceSkia*>(device);
+    real_device = vector_device->pdf_device_.get();
+  }
+  pdf_device_->drawDevice(draw, real_device, x, y, paint);
+}
+
+#if defined(OS_WIN)
+void VectorPlatformDeviceSkia::drawToHDC(HDC dc,
+                                         int x,
+                                         int y,
+                                         const RECT* src_rect) {
+  SkASSERT(false);
+}
+#endif
+
+void VectorPlatformDeviceSkia::setInitialTransform(int xOffset, int yOffset,
+                                                   float scale_factor) {
+  // TODO(vandebo) Supporting a scale factor is some work because we have to
+  // transform both matrices and clips that come in, but Region only supports
+  // translation.  Instead, we could change SkPDFDevice to include it in the
+  // initial transform.  Delay that work until we would use it.  Also checked
+  // in setMatrixClip.
+  DCHECK_EQ(1.0f, scale_factor);
+
+  base_transform_.setTranslate(xOffset, yOffset);
+  SkScalar scale = SkFloatToScalar(scale_factor);
+  base_transform_.postScale(scale, scale);
+
+  SkMatrix matrix;
+  matrix.reset();
+  SkRegion region;
+  SkClipStack stack;
+  setMatrixClip(matrix, region, stack);
+}
+
+}  // namespace skia