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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrPictureUtils.h"
#include "SkDevice.h"
// The GrGather device performs GPU-backend-specific preprocessing on
// a picture. The results are stored in a GPUAccelData.
//
// Currently the only interesting work is done in drawDevice (i.e., when a
// saveLayer is collapsed back into its parent) and, maybe, in onCreateDevice.
// All the current work could be done much more efficiently by just traversing the
// raw op codes in the SkPicture (although we would still need to replay all the
// clip calls).
class GrGatherDevice : public SkBaseDevice {
public:
SK_DECLARE_INST_COUNT(GrGatherDevice)
GrGatherDevice(int width, int height, SkPicture* picture, GPUAccelData* accelData) {
fPicture = picture;
fInfo.fSize.set(width, height);
fInfo.fSaveLayerOpID = fPicture->EXPERIMENTAL_curOpID();
fInfo.fRestoreOpID = 0;
fInfo.fHasNestedLayers = false;
fEmptyBitmap.setConfig(SkImageInfo::Make(fInfo.fSize.fWidth,
fInfo.fSize.fHeight,
kUnknown_SkColorType,
kIgnore_SkAlphaType));
fAccelData = accelData;
fAlreadyDrawn = false;
}
virtual ~GrGatherDevice() { }
virtual int width() const SK_OVERRIDE { return fInfo.fSize.width(); }
virtual int height() const SK_OVERRIDE { return fInfo.fSize.height(); }
virtual bool isOpaque() const SK_OVERRIDE { return false; }
virtual SkBitmap::Config config() const SK_OVERRIDE {
return SkBitmap::kNo_Config;
}
virtual SkImageInfo imageInfo() const SK_OVERRIDE {
return fEmptyBitmap.info();
}
#ifdef SK_SUPPORT_LEGACY_WRITEPIXELSCONFIG
virtual void writePixels(const SkBitmap& bitmap, int x, int y,
SkCanvas::Config8888 config8888) SK_OVERRIDE {
NotSupported();
}
#endif
virtual GrRenderTarget* accessRenderTarget() SK_OVERRIDE { return NULL; }
protected:
virtual bool filterTextFlags(const SkPaint& paint, TextFlags*) SK_OVERRIDE {
return false;
}
virtual void clear(SkColor color) SK_OVERRIDE {
NothingToDo();
}
virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, size_t count,
const SkPoint points[], const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawRect(const SkDraw& draw, const SkRect& rect,
const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawOval(const SkDraw& draw, const SkRect& rect,
const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawRRect(const SkDraw& draw, const SkRRect& rrect,
const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawPath(const SkDraw& draw, const SkPath& path,
const SkPaint& paint, const SkMatrix* prePathMatrix,
bool pathIsMutable) SK_OVERRIDE {
}
virtual void drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
const SkMatrix& matrix, const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
int x, int y, const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
const SkRect* srcOrNull, const SkRect& dst,
const SkPaint& paint,
SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE {
}
virtual void drawText(const SkDraw& draw, const void* text, size_t len,
SkScalar x, SkScalar y,
const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawPosText(const SkDraw& draw, const void* text, size_t len,
const SkScalar pos[], SkScalar constY,
int scalarsPerPos, const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawTextOnPath(const SkDraw& draw, const void* text, size_t len,
const SkPath& path, const SkMatrix* matrix,
const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawVertices(const SkDraw& draw, SkCanvas::VertexMode, int vertexCount,
const SkPoint verts[], const SkPoint texs[],
const SkColor colors[], SkXfermode* xmode,
const uint16_t indices[], int indexCount,
const SkPaint& paint) SK_OVERRIDE {
}
virtual void drawDevice(const SkDraw& draw, SkBaseDevice* deviceIn, int x, int y,
const SkPaint&) SK_OVERRIDE {
GrGatherDevice* device = static_cast<GrGatherDevice*>(deviceIn);
if (device->fAlreadyDrawn) {
return;
}
device->fInfo.fRestoreOpID = fPicture->EXPERIMENTAL_curOpID();
fAccelData->addSaveLayerInfo(device->fInfo);
device->fAlreadyDrawn = true;
}
// TODO: allow this call to return failure, or move to SkBitmapDevice only.
virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE {
return fEmptyBitmap;
}
#ifdef SK_SUPPORT_LEGACY_READPIXELSCONFIG
virtual bool onReadPixels(const SkBitmap& bitmap,
int x, int y,
SkCanvas::Config8888 config8888) SK_OVERRIDE {
NotSupported();
return false;
}
#endif
virtual void lockPixels() SK_OVERRIDE { NothingToDo(); }
virtual void unlockPixels() SK_OVERRIDE { NothingToDo(); }
virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
SkBitmap* result, SkIPoint* offset) SK_OVERRIDE {
return false;
}
private:
// The picture being processed
SkPicture *fPicture;
SkBitmap fEmptyBitmap; // legacy -- need to remove
// All information gathered during the gather process is stored here
GPUAccelData* fAccelData;
// true if this device has already been drawn back to its parent(s) at least
// once.
bool fAlreadyDrawn;
// The information regarding the saveLayer call this device represents.
GPUAccelData::SaveLayerInfo fInfo;
virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
NotSupported();
}
virtual SkBaseDevice* onCreateDevice(const SkImageInfo& info, Usage usage) SK_OVERRIDE {
// we expect to only get called via savelayer, in which case it is fine.
SkASSERT(kSaveLayer_Usage == usage);
fInfo.fHasNestedLayers = true;
return SkNEW_ARGS(GrGatherDevice, (info.width(), info.height(), fPicture, fAccelData));
}
virtual void flush() SK_OVERRIDE {}
static void NotSupported() {
SkDEBUGFAIL("this method should never be called");
}
static void NothingToDo() {}
typedef SkBaseDevice INHERITED;
};
// The GrGatherCanvas allows saveLayers but simplifies clipping. It is really
// only intended to be used as:
//
// GrGatherDevice dev(w, h, picture, accelData);
// GrGatherCanvas canvas(..., picture);
// canvas.gather();
//
// which is all just to fill in 'accelData'
class SK_API GrGatherCanvas : public SkCanvas {
public:
GrGatherCanvas(GrGatherDevice* device, SkPicture* pict)
: INHERITED(device)
, fPicture(pict) {
}
void gather() {
if (NULL == fPicture || 0 == fPicture->width() || 0 == fPicture->height()) {
return;
}
this->clipRect(SkRect::MakeWH(SkIntToScalar(fPicture->width()),
SkIntToScalar(fPicture->height())),
SkRegion::kIntersect_Op, false);
this->drawPicture(*fPicture);
}
virtual void drawPicture(SkPicture& picture) SK_OVERRIDE {
picture.draw(this);
}
protected:
// disable aa for speed
virtual void onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
this->INHERITED::onClipRect(rect, op, kHard_ClipEdgeStyle);
}
// for speed, just respect the bounds, and disable AA. May give us a few
// false positives and negatives.
virtual void onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
this->updateClipConservativelyUsingBounds(path.getBounds(), op,
path.isInverseFillType());
}
virtual void onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle) SK_OVERRIDE {
this->updateClipConservativelyUsingBounds(rrect.getBounds(), op, false);
}
private:
SkPicture* fPicture;
typedef SkCanvas INHERITED;
};
// GatherGPUInfo is only intended to be called within the context of SkGpuDevice's
// EXPERIMENTAL_optimize method.
void GatherGPUInfo(SkPicture* pict, GPUAccelData* accelData) {
if (0 == pict->width() || 0 == pict->height()) {
return ;
}
GrGatherDevice device(pict->width(), pict->height(), pict, accelData);
GrGatherCanvas canvas(&device, pict);
canvas.gather();
}