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skia2/include/gpu/GrDrawContext.h

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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrDrawContext_DEFINED
#define GrDrawContext_DEFINED
#include "GrColor.h"
#include "GrRenderTarget.h"
#include "SkRefCnt.h"
#include "SkSurfaceProps.h"
#include "../private/GrSingleOwner.h"
class GrAuditTrail;
class GrClip;
class GrContext;
class GrDrawBatch;
class GrDrawPathBatchBase;
class GrDrawingManager;
class GrDrawTarget;
class GrPaint;
class GrPathProcessor;
class GrPipelineBuilder;
class GrRenderTarget;
class GrStrokeInfo;
class GrSurface;
class GrTextContext;
class SkDrawFilter;
struct SkIPoint;
struct SkIRect;
class SkMatrix;
class SkPaint;
class SkPath;
struct SkPoint;
struct SkRect;
class SkRRect;
struct SkRSXform;
class SkTextBlob;
/*
* A helper object to orchestrate draws
*/
class SK_API GrDrawContext : public SkRefCnt {
public:
~GrDrawContext() override;
void copySurface(GrSurface* src, const SkIRect& srcRect, const SkIPoint& dstPoint);
// TODO: it is odd that we need both the SkPaint in the following 3 methods.
// We should extract the text parameters from SkPaint and pass them separately
// akin to GrStrokeInfo (GrTextInfo?)
void drawText(const GrClip&, const GrPaint&, const SkPaint&,
const SkMatrix& viewMatrix, const char text[], size_t byteLength,
SkScalar x, SkScalar y, const SkIRect& clipBounds);
void drawPosText(const GrClip&, const GrPaint&, const SkPaint&,
const SkMatrix& viewMatrix, const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset, const SkIRect& clipBounds);
void drawTextBlob(const GrClip&, const SkPaint&,
const SkMatrix& viewMatrix, const SkTextBlob*,
SkScalar x, SkScalar y,
SkDrawFilter*, const SkIRect& clipBounds);
/**
* Provides a perfomance hint that the render target's contents are allowed
* to become undefined.
*/
void discard();
/**
* Clear the entire or rect of the render target, ignoring any clips.
* @param rect the rect to clear or the whole thing if rect is NULL.
* @param color the color to clear to.
* @param canIgnoreRect allows partial clears to be converted to whole
* clears on platforms for which that is cheap
*/
void clear(const SkIRect* rect, GrColor color, bool canIgnoreRect);
/**
* Draw everywhere (respecting the clip) with the paint.
*/
void drawPaint(const GrClip&, const GrPaint&, const SkMatrix& viewMatrix);
/**
* Draw the rect using a paint.
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix
* @param strokeInfo the stroke information (width, join, cap), and.
* the dash information (intervals, count, phase).
* If strokeInfo == NULL, then the rect is filled.
* Otherwise, if stroke width == 0, then the stroke
* is always a single pixel thick, else the rect is
* mitered/beveled stroked based on stroke width.
* The rects coords are used to access the paint (through texture matrix)
*/
void drawRect(const GrClip&,
const GrPaint& paint,
const SkMatrix& viewMatrix,
const SkRect&,
const GrStrokeInfo* strokeInfo = NULL);
/**
* Maps a rectangle of shader coordinates to a rectangle and fills that rectangle.
*
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix which applies to rectToDraw
* @param rectToDraw the rectangle to draw
* @param localRect the rectangle of shader coordinates applied to rectToDraw
*/
void fillRectToRect(const GrClip&,
const GrPaint& paint,
const SkMatrix& viewMatrix,
const SkRect& rectToDraw,
const SkRect& localRect);
/**
* Fills a rect with a paint and a localMatrix.
*/
void fillRectWithLocalMatrix(const GrClip& clip,
const GrPaint& paint,
const SkMatrix& viewMatrix,
const SkRect& rect,
const SkMatrix& localMatrix);
/**
* Draw a roundrect using a paint.
*
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix
* @param rrect the roundrect to draw
* @param strokeInfo the stroke information (width, join, cap) and
* the dash information (intervals, count, phase).
*/
void drawRRect(const GrClip&,
const GrPaint&,
const SkMatrix& viewMatrix,
const SkRRect& rrect,
const GrStrokeInfo&);
/**
* Shortcut for drawing an SkPath consisting of nested rrects using a paint.
* Does not support stroking. The result is undefined if outer does not contain
* inner.
*
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix
* @param outer the outer roundrect
* @param inner the inner roundrect
*/
void drawDRRect(const GrClip&,
const GrPaint&,
const SkMatrix& viewMatrix,
const SkRRect& outer,
const SkRRect& inner);
/**
* Draws a path.
*
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix
* @param path the path to draw
* @param strokeInfo the stroke information (width, join, cap) and
* the dash information (intervals, count, phase).
*/
void drawPath(const GrClip&,
const GrPaint&,
const SkMatrix& viewMatrix,
const SkPath&,
const GrStrokeInfo&);
/**
* Draws vertices with a paint.
*
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix
* @param primitiveType primitives type to draw.
* @param vertexCount number of vertices.
* @param positions array of vertex positions, required.
* @param texCoords optional array of texture coordinates used
* to access the paint.
* @param colors optional array of per-vertex colors, supercedes
* the paint's color field.
* @param indices optional array of indices. If NULL vertices
* are drawn non-indexed.
* @param indexCount if indices is non-null then this is the
* number of indices.
*/
void drawVertices(const GrClip&,
const GrPaint& paint,
const SkMatrix& viewMatrix,
GrPrimitiveType primitiveType,
int vertexCount,
const SkPoint positions[],
const SkPoint texs[],
const GrColor colors[],
const uint16_t indices[],
int indexCount);
/**
* Draws textured sprites from an atlas with a paint.
*
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix
* @param spriteCount number of sprites.
* @param xform array of compressed transformation data, required.
* @param texRect array of texture rectangles used to access the paint.
* @param colors optional array of per-sprite colors, supercedes
* the paint's color field.
*/
void drawAtlas(const GrClip&,
const GrPaint& paint,
const SkMatrix& viewMatrix,
int spriteCount,
const SkRSXform xform[],
const SkRect texRect[],
const SkColor colors[]);
/**
* Draws an oval.
*
* @param paint describes how to color pixels.
* @param viewMatrix transformation matrix
* @param oval the bounding rect of the oval.
* @param strokeInfo the stroke information (width, join, cap) and
* the dash information (intervals, count, phase).
*/
void drawOval(const GrClip&,
const GrPaint& paint,
const SkMatrix& viewMatrix,
const SkRect& oval,
const GrStrokeInfo& strokeInfo);
/**
* Draw the image stretched differentially to fit into dst.
* center is a rect within the image, and logically divides the image
* into 9 sections (3x3). For example, if the middle pixel of a [5x5]
* image is the "center", then the center-rect should be [2, 2, 3, 3].
*
* If the dst is >= the image size, then...
* - The 4 corners are not stretched at all.
* - The sides are stretched in only one axis.
* - The center is stretched in both axes.
* Else, for each axis where dst < image,
* - The corners shrink proportionally
* - The sides (along the shrink axis) and center are not drawn
*/
void drawImageNine(const GrClip&,
const GrPaint& paint,
const SkMatrix& viewMatrix,
int imageWidth,
int imageHeight,
const SkIRect& center,
const SkRect& dst);
/**
* Draws a batch
*
* @param paint describes how to color pixels.
* @param batch the batch to draw
*/
void drawBatch(const GrClip&, const GrPaint&, GrDrawBatch*);
/**
* Draws a path batch. This needs to be separate from drawBatch because we install path stencil
* settings late.
*
* TODO: Figure out a better model that allows us to roll this method into drawBatch.
*/
void drawPathBatch(const GrPipelineBuilder&, GrDrawPathBatchBase*);
int width() const { return fRenderTarget->width(); }
int height() const { return fRenderTarget->height(); }
int numColorSamples() const { return fRenderTarget->numColorSamples(); }
GrRenderTarget* accessRenderTarget() { return fRenderTarget; }
///////////////////////////////////////////////////////////////////////////////////////////////
// Functions intended for internal use only.
void internal_drawBatch(const GrPipelineBuilder& pipelineBuilder, GrDrawBatch* batch);
private:
friend class GrAtlasTextBlob; // for access to drawBatch
friend class GrDrawingManager; // for ctor
SkDEBUGCODE(void validate() const;)
GrDrawContext(GrContext*, GrDrawingManager*, GrRenderTarget*,
const SkSurfaceProps* surfaceProps, GrAuditTrail*, GrSingleOwner*);
void internalDrawPath(GrPipelineBuilder*,
const SkMatrix& viewMatrix,
GrColor,
bool useAA,
const SkPath&,
const GrStrokeInfo&);
// This entry point allows the GrTextContext-derived classes to add their batches to
// the drawTarget.
void drawBatch(GrPipelineBuilder* pipelineBuilder, GrDrawBatch* batch);
GrDrawTarget* getDrawTarget();
GrDrawingManager* fDrawingManager;
GrRenderTarget* fRenderTarget;
// In MDB-mode the drawTarget can be closed by some other drawContext that has picked
// it up. For this reason, the drawTarget should only ever be accessed via 'getDrawTarget'.
GrDrawTarget* fDrawTarget;
GrTextContext* fTextContext; // lazily gotten from GrContext::DrawingManager
GrContext* fContext;
SkSurfaceProps fSurfaceProps;
GrAuditTrail* fAuditTrail;
// In debug builds we guard against improper thread handling
SkDEBUGCODE(mutable GrSingleOwner* fSingleOwner;)
};
#endif
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