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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrDrawState_DEFINED
#define GrDrawState_DEFINED
#include "GrColor.h"
#include "GrMatrix.h"
#include "GrNoncopyable.h"
#include "GrRefCnt.h"
#include "GrSamplerState.h"
#include "GrStencil.h"
#include "GrTexture.h"
#include "GrRenderTarget.h"
#include "effects/GrSingleTextureEffect.h"
#include "SkXfermode.h"
class GrPaint;
class GrDrawState : public GrRefCnt {
public:
SK_DECLARE_INST_COUNT(GrDrawState)
/**
* Number of texture stages. Each stage takes as input a color and
* 2D texture coordinates. The color input to the first enabled stage is the
* per-vertex color or the constant color (setColor/setAlpha) if there are
* no per-vertex colors. For subsequent stages the input color is the output
* color from the previous enabled stage. The output color of each stage is
* the input color modulated with the result of a texture lookup. Texture
* lookups are specified by a texture a sampler (setSamplerState). Texture
* coordinates for each stage come from the vertices based on a
* GrVertexLayout bitfield. The output fragment color is the output color of
* the last enabled stage. The presence or absence of texture coordinates
* for each stage in the vertex layout indicates whether a stage is enabled
* or not.
*
* Stages 0 through GrPaint::kTotalStages-1 are reserved for setting up
* the draw (i.e., textures and filter masks). Stages GrPaint::kTotalStages
* through kNumStages-2 are earmarked for use by GrTextContext and
* GrPathRenderer-derived classes. kNumStages-1 is earmarked for clipping
* by GrClipMaskManager.
*/
enum {
kNumStages = 5,
kMaxTexCoords = kNumStages
};
GrDrawState()
: fRenderTarget(NULL) {
this->reset();
}
GrDrawState(const GrDrawState& state)
: fRenderTarget(NULL) {
*this = state;
}
virtual ~GrDrawState() {
this->disableStages();
GrSafeSetNull(fRenderTarget);
}
/**
* Resets to the default state.
* Sampler states *will* be modified: textures or CustomStage objects
* will be released.
*/
void reset() {
this->disableStages();
fColor = 0xffffffff;
fViewMatrix.reset();
GrSafeSetNull(fRenderTarget);
fSrcBlend = kOne_GrBlendCoeff;
fDstBlend = kZero_GrBlendCoeff;
fBlendConstant = 0x0;
fFlagBits = 0x0;
fVertexEdgeType = kHairLine_EdgeType;
fStencilSettings.setDisabled();
fFirstCoverageStage = kNumStages;
fCoverage = 0xffffffff;
fColorFilterMode = SkXfermode::kDst_Mode;
fColorFilterColor = 0x0;
fDrawFace = kBoth_DrawFace;
}
/**
* Initializes the GrDrawState based on a GrPaint. Note that GrDrawState
* encompasses more than GrPaint. Aspects of GrDrawState that have no
* GrPaint equivalents are not modified. GrPaint has fewer stages than
* GrDrawState. The extra GrDrawState stages are disabled.
*/
void setFromPaint(const GrPaint& paint);
///////////////////////////////////////////////////////////////////////////
/// @name Color
////
/**
* Sets color for next draw to a premultiplied-alpha color.
*
* @param color the color to set.
*/
void setColor(GrColor color) { fColor = color; }
GrColor getColor() const { return fColor; }
/**
* Sets the color to be used for the next draw to be
* (r,g,b,a) = (alpha, alpha, alpha, alpha).
*
* @param alpha The alpha value to set as the color.
*/
void setAlpha(uint8_t a) {
this->setColor((a << 24) | (a << 16) | (a << 8) | a);
}
/**
* Add a color filter that can be represented by a color and a mode. Applied
* after color-computing texture stages.
*/
void setColorFilter(GrColor c, SkXfermode::Mode mode) {
fColorFilterColor = c;
fColorFilterMode = mode;
}
GrColor getColorFilterColor() const { return fColorFilterColor; }
SkXfermode::Mode getColorFilterMode() const { return fColorFilterMode; }
/**
* Constructor sets the color to be 'color' which is undone by the destructor.
*/
class AutoColorRestore : public ::GrNoncopyable {
public:
AutoColorRestore(GrDrawState* drawState, GrColor color) {
fDrawState = drawState;
fOldColor = fDrawState->getColor();
fDrawState->setColor(color);
}
~AutoColorRestore() {
fDrawState->setColor(fOldColor);
}
private:
GrDrawState* fDrawState;
GrColor fOldColor;
};
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Coverage
////
/**
* Sets a constant fractional coverage to be applied to the draw. The
* initial value (after construction or reset()) is 0xff. The constant
* coverage is ignored when per-vertex coverage is provided.
*/
void setCoverage(uint8_t coverage) {
fCoverage = GrColorPackRGBA(coverage, coverage, coverage, coverage);
}
/**
* Version of above that specifies 4 channel per-vertex color. The value
* should be premultiplied.
*/
void setCoverage4(GrColor coverage) {
fCoverage = coverage;
}
GrColor getCoverage() const {
return fCoverage;
}
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Textures
////
/**
* Creates a GrSingleTextureEffect.
*/
void createTextureEffect(int stage, GrTexture* texture) {
GrAssert(!this->getSampler(stage).getCustomStage());
this->sampler(stage)->setCustomStage(
SkNEW_ARGS(GrSingleTextureEffect, (texture)))->unref();
}
void createTextureEffect(int stage, GrTexture* texture, const GrMatrix& matrix) {
GrAssert(!this->getSampler(stage).getCustomStage());
GrCustomStage* customStage = SkNEW_ARGS(GrSingleTextureEffect, (texture));
this->sampler(stage)->setCustomStage(customStage, matrix)->unref();
}
void createTextureEffect(int stage, GrTexture* texture,
const GrMatrix& matrix,
const GrTextureParams& params) {
GrAssert(!this->getSampler(stage).getCustomStage());
GrCustomStage* customStage = SkNEW_ARGS(GrSingleTextureEffect, (texture, params));
this->sampler(stage)->setCustomStage(customStage, matrix)->unref();
}
bool stagesDisabled() {
for (int i = 0; i < kNumStages; ++i) {
if (NULL != fSamplerStates[i].getCustomStage()) {
return false;
}
}
return true;
}
void disableStage(int index) {
fSamplerStates[index].setCustomStage(NULL);
}
/**
* Release all the textures and custom stages referred to by this
* draw state.
*/
void disableStages() {
for (int i = 0; i < kNumStages; ++i) {
this->disableStage(i);
}
}
class AutoStageDisable : public ::GrNoncopyable {
public:
AutoStageDisable(GrDrawState* ds) : fDrawState(ds) {}
~AutoStageDisable() {
if (NULL != fDrawState) {
fDrawState->disableStages();
}
}
private:
GrDrawState* fDrawState;
};
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Samplers
////
/**
* Returns the current sampler for a stage.
*/
const GrSamplerState& getSampler(int stage) const {
GrAssert((unsigned)stage < kNumStages);
return fSamplerStates[stage];
}
/**
* Writable pointer to a stage's sampler.
*/
GrSamplerState* sampler(int stage) {
GrAssert((unsigned)stage < kNumStages);
return fSamplerStates + stage;
}
/**
* Preconcats the matrix of all samplers of enabled stages with a matrix.
*/
void preConcatSamplerMatrices(const GrMatrix& matrix) {
for (int i = 0; i < kNumStages; ++i) {
if (this->isStageEnabled(i)) {
fSamplerStates[i].preConcatMatrix(matrix);
}
}
}
/**
* Preconcats the matrix of all samplers in the mask with the inverse of a
* matrix. If the matrix inverse cannot be computed (and there is at least
* one enabled stage) then false is returned.
*/
bool preConcatSamplerMatricesWithInverse(const GrMatrix& matrix) {
GrMatrix inv;
bool computed = false;
for (int i = 0; i < kNumStages; ++i) {
if (this->isStageEnabled(i)) {
if (!computed && !matrix.invert(&inv)) {
return false;
} else {
computed = true;
}
fSamplerStates[i].preConcatMatrix(inv);
}
}
return true;
}
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Coverage / Color Stages
////
/**
* A common pattern is to compute a color with the initial stages and then
* modulate that color by a coverage value in later stage(s) (AA, mask-
* filters, glyph mask, etc). Color-filters, xfermodes, etc should be
* computed based on the pre-coverage-modulated color. The division of
* stages between color-computing and coverage-computing is specified by
* this method. Initially this is kNumStages (all stages
* are color-computing).
*/
void setFirstCoverageStage(int firstCoverageStage) {
GrAssert((unsigned)firstCoverageStage <= kNumStages);
fFirstCoverageStage = firstCoverageStage;
}
/**
* Gets the index of the first coverage-computing stage.
*/
int getFirstCoverageStage() const {
return fFirstCoverageStage;
}
///@}
///////////////////////////////////////////////////////////////////////////
/// @name Blending
////
/**
* Sets the blending function coefficients.
*
* The blend function will be:
* D' = sat(S*srcCoef + D*dstCoef)
*
* where D is the existing destination color, S is the incoming source
* color, and D' is the new destination color that will be written. sat()
* is the saturation function.
*
* @param srcCoef coefficient applied to the src color.
* @param dstCoef coefficient applied to the dst color.
*/
void setBlendFunc(GrBlendCoeff srcCoeff, GrBlendCoeff dstCoeff) {
fSrcBlend = srcCoeff;
fDstBlend = dstCoeff;
#if GR_DEBUG
switch (dstCoeff) {
case kDC_GrBlendCoeff:
case kIDC_GrBlendCoeff:
case kDA_GrBlendCoeff:
case kIDA_GrBlendCoeff:
GrPrintf("Unexpected dst blend coeff. Won't work correctly with"
"coverage stages.\n");
break;
default:
break;
}
switch (srcCoeff) {
case kSC_GrBlendCoeff:
case kISC_GrBlendCoeff:
case kSA_GrBlendCoeff:
case kISA_GrBlendCoeff:
GrPrintf("Unexpected src blend coeff. Won't work correctly with"
"coverage stages.\n");
break;
default:
break;
}
#endif
}
GrBlendCoeff getSrcBlendCoeff() const { return fSrcBlend; }
GrBlendCoeff getDstBlendCoeff() const { return fDstBlend; }
void getDstBlendCoeff(GrBlendCoeff* srcBlendCoeff,
GrBlendCoeff* dstBlendCoeff) const {
*srcBlendCoeff = fSrcBlend;
*dstBlendCoeff = fDstBlend;
}
/**
* Sets the blending function constant referenced by the following blending
* coefficients:
* kConstC_GrBlendCoeff
* kIConstC_GrBlendCoeff
* kConstA_GrBlendCoeff
* kIConstA_GrBlendCoeff
*
* @param constant the constant to set
*/
void setBlendConstant(GrColor constant) { fBlendConstant = constant; }
/**
* Retrieves the last value set by setBlendConstant()
* @return the blending constant value
*/
GrColor getBlendConstant() const { return fBlendConstant; }
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name View Matrix
////
/**
* Sets the matrix applied to vertex positions.
*
* In the post-view-matrix space the rectangle [0,w]x[0,h]
* fully covers the render target. (w and h are the width and height of the
* the rendertarget.)
*/
void setViewMatrix(const GrMatrix& m) { fViewMatrix = m; }
/**
* Gets a writable pointer to the view matrix.
*/
GrMatrix* viewMatrix() { return &fViewMatrix; }
/**
* Multiplies the current view matrix by a matrix
*
* After this call V' = V*m where V is the old view matrix,
* m is the parameter to this function, and V' is the new view matrix.
* (We consider positions to be column vectors so position vector p is
* transformed by matrix X as p' = X*p.)
*
* @param m the matrix used to modify the view matrix.
*/
void preConcatViewMatrix(const GrMatrix& m) { fViewMatrix.preConcat(m); }
/**
* Multiplies the current view matrix by a matrix
*
* After this call V' = m*V where V is the old view matrix,
* m is the parameter to this function, and V' is the new view matrix.
* (We consider positions to be column vectors so position vector p is
* transformed by matrix X as p' = X*p.)
*
* @param m the matrix used to modify the view matrix.
*/
void postConcatViewMatrix(const GrMatrix& m) { fViewMatrix.postConcat(m); }
/**
* Retrieves the current view matrix
* @return the current view matrix.
*/
const GrMatrix& getViewMatrix() const { return fViewMatrix; }
/**
* Retrieves the inverse of the current view matrix.
*
* If the current view matrix is invertible, return true, and if matrix
* is non-null, copy the inverse into it. If the current view matrix is
* non-invertible, return false and ignore the matrix parameter.
*
* @param matrix if not null, will receive a copy of the current inverse.
*/
bool getViewInverse(GrMatrix* matrix) const {
// TODO: determine whether we really need to leave matrix unmodified
// at call sites when inversion fails.
GrMatrix inverse;
if (fViewMatrix.invert(&inverse)) {
if (matrix) {
*matrix = inverse;
}
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////////////
/**
* Preconcats the current view matrix and restores the previous view matrix in the destructor.
* Stage matrices are automatically adjusted to compensate.
*/
class AutoViewMatrixRestore : public ::GrNoncopyable {
public:
AutoViewMatrixRestore() : fDrawState(NULL) {}
AutoViewMatrixRestore(GrDrawState* ds,
const GrMatrix& preconcatMatrix,
uint32_t explicitCoordStageMask = 0) {
fDrawState = NULL;
this->set(ds, preconcatMatrix, explicitCoordStageMask);
}
~AutoViewMatrixRestore() { this->restore(); }
/**
* Can be called prior to destructor to restore the original matrix.
*/
void restore();
void set(GrDrawState* drawState,
const GrMatrix& preconcatMatrix,
uint32_t explicitCoordStageMask = 0);
bool isSet() const { return NULL != fDrawState; }
private:
GrDrawState* fDrawState;
GrMatrix fViewMatrix;
GrMatrix fSamplerMatrices[GrDrawState::kNumStages];
uint32_t fRestoreMask;
};
////////////////////////////////////////////////////////////////////////////
/**
* This sets the view matrix to identity and adjusts stage matrices to compensate. The
* destructor undoes the changes, restoring the view matrix that was set before the
* constructor. It is similar to passing the inverse of the current view matrix to
* AutoViewMatrixRestore, but lazily computes the inverse only if necessary.
*/
class AutoDeviceCoordDraw : ::GrNoncopyable {
public:
AutoDeviceCoordDraw() : fDrawState(NULL) {}
/**
* If a stage's texture matrix is applied to explicit per-vertex coords, rather than to
* positions, then we don't want to modify its matrix. The explicitCoordStageMask is used
* to specify such stages.
*/
AutoDeviceCoordDraw(GrDrawState* drawState,
uint32_t explicitCoordStageMask = 0) {
fDrawState = NULL;
this->set(drawState, explicitCoordStageMask);
}
~AutoDeviceCoordDraw() { this->restore(); }
bool set(GrDrawState* drawState, uint32_t explicitCoordStageMask = 0);
/**
* Returns true if this object was successfully initialized on to a GrDrawState. It may
* return false because a non-default constructor or set() were never called or because
* the view matrix was not invertible.
*/
bool succeeded() const { return NULL != fDrawState; }
/**
* Returns the matrix that was set previously set on the drawState. This is only valid
* if succeeded returns true.
*/
const GrMatrix& getOriginalMatrix() const {
GrAssert(this->succeeded());
return fViewMatrix;
}
/**
* Can be called prior to destructor to restore the original matrix.
*/
void restore();
private:
GrDrawState* fDrawState;
GrMatrix fViewMatrix;
GrMatrix fSamplerMatrices[GrDrawState::kNumStages];
uint32_t fRestoreMask;
};
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Render Target
////
/**
* Sets the rendertarget used at the next drawing call
*
* @param target The render target to set.
*/
void setRenderTarget(GrRenderTarget* target) {
GrSafeAssign(fRenderTarget, target);
}
/**
* Retrieves the currently set rendertarget.
*
* @return The currently set render target.
*/
const GrRenderTarget* getRenderTarget() const { return fRenderTarget; }
GrRenderTarget* getRenderTarget() { return fRenderTarget; }
class AutoRenderTargetRestore : public ::GrNoncopyable {
public:
AutoRenderTargetRestore() : fDrawState(NULL), fSavedTarget(NULL) {}
AutoRenderTargetRestore(GrDrawState* ds, GrRenderTarget* newTarget) {
fDrawState = NULL;
fSavedTarget = NULL;
this->set(ds, newTarget);
}
~AutoRenderTargetRestore() { this->restore(); }
void restore() {
if (NULL != fDrawState) {
fDrawState->setRenderTarget(fSavedTarget);
fDrawState = NULL;
}
GrSafeSetNull(fSavedTarget);
}
void set(GrDrawState* ds, GrRenderTarget* newTarget) {
this->restore();
if (NULL != ds) {
GrAssert(NULL == fSavedTarget);
fSavedTarget = ds->getRenderTarget();
SkSafeRef(fSavedTarget);
ds->setRenderTarget(newTarget);
fDrawState = ds;
}
}
private:
GrDrawState* fDrawState;
GrRenderTarget* fSavedTarget;
};
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Stencil
////
/**
* Sets the stencil settings to use for the next draw.
* Changing the clip has the side-effect of possibly zeroing
* out the client settable stencil bits. So multipass algorithms
* using stencil should not change the clip between passes.
* @param settings the stencil settings to use.
*/
void setStencil(const GrStencilSettings& settings) {
fStencilSettings = settings;
}
/**
* Shortcut to disable stencil testing and ops.
*/
void disableStencil() {
fStencilSettings.setDisabled();
}
const GrStencilSettings& getStencil() const { return fStencilSettings; }
GrStencilSettings* stencil() { return &fStencilSettings; }
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Color Matrix
////
/**
* Sets the color matrix to use for the next draw.
* @param matrix the 5x4 matrix to apply to the incoming color
*/
void setColorMatrix(const float matrix[20]) {
memcpy(fColorMatrix, matrix, sizeof(fColorMatrix));
}
const float* getColorMatrix() const { return fColorMatrix; }
/// @}
///////////////////////////////////////////////////////////////////////////
// @name Edge AA
// Edge equations can be specified to perform anti-aliasing. Because the
// edges are specified as per-vertex data, vertices that are shared by
// multiple edges must be split.
//
////
/**
* When specifying edges as vertex data this enum specifies what type of
* edges are in use. The edges are always 4 GrScalars in memory, even when
* the edge type requires fewer than 4.
*
* TODO: Fix the fact that HairLine and Circle edge types use y-down coords.
* (either adjust in VS or use origin_upper_left in GLSL)
*/
enum VertexEdgeType {
/* 1-pixel wide line
2D implicit line eq (a*x + b*y +c = 0). 4th component unused */
kHairLine_EdgeType,
/* Quadratic specified by u^2-v canonical coords (only 2
components used). Coverage based on signed distance with negative
being inside, positive outside. Edge specified in window space
(y-down) */
kQuad_EdgeType,
/* Same as above but for hairline quadratics. Uses unsigned distance.
Coverage is min(0, 1-distance). */
kHairQuad_EdgeType,
/* Circle specified as center_x, center_y, outer_radius, inner_radius
all in window space (y-down). */
kCircle_EdgeType,
kVertexEdgeTypeCnt
};
/**
* Determines the interpretation per-vertex edge data when the
* kEdge_VertexLayoutBit is set (see GrDrawTarget). When per-vertex edges
* are not specified the value of this setting has no effect.
*/
void setVertexEdgeType(VertexEdgeType type) {
GrAssert(type >=0 && type < kVertexEdgeTypeCnt);
fVertexEdgeType = type;
}
VertexEdgeType getVertexEdgeType() const { return fVertexEdgeType; }
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name State Flags
////
/**
* Flags that affect rendering. Controlled using enable/disableState(). All
* default to disabled.
*/
enum StateBits {
/**
* Perform dithering. TODO: Re-evaluate whether we need this bit
*/
kDither_StateBit = 0x01,
/**
* Perform HW anti-aliasing. This means either HW FSAA, if supported
* by the render target, or smooth-line rendering if a line primitive
* is drawn and line smoothing is supported by the 3D API.
*/
kHWAntialias_StateBit = 0x02,
/**
* Draws will respect the clip, otherwise the clip is ignored.
*/
kClip_StateBit = 0x04,
/**
* Disables writing to the color buffer. Useful when performing stencil
* operations.
*/
kNoColorWrites_StateBit = 0x08,
/**
* Draws will apply the color matrix, otherwise the color matrix is
* ignored.
*/
kColorMatrix_StateBit = 0x10,
// Users of the class may add additional bits to the vector
kDummyStateBit,
kLastPublicStateBit = kDummyStateBit-1,
};
void resetStateFlags() {
fFlagBits = 0;
}
/**
* Enable render state settings.
*
* @param stateBits bitfield of StateBits specifying the states to enable
*/
void enableState(uint32_t stateBits) {
fFlagBits |= stateBits;
}
/**
* Disable render state settings.
*
* @param stateBits bitfield of StateBits specifying the states to disable
*/
void disableState(uint32_t stateBits) {
fFlagBits &= ~(stateBits);
}
/**
* Enable or disable stateBits based on a boolean.
*
* @param stateBits bitfield of StateBits to enable or disable
* @param enable if true enable stateBits, otherwise disable
*/
void setState(uint32_t stateBits, bool enable) {
if (enable) {
this->enableState(stateBits);
} else {
this->disableState(stateBits);
}
}
bool isDitherState() const {
return 0 != (fFlagBits & kDither_StateBit);
}
bool isHWAntialiasState() const {
return 0 != (fFlagBits & kHWAntialias_StateBit);
}
bool isClipState() const {
return 0 != (fFlagBits & kClip_StateBit);
}
bool isColorWriteDisabled() const {
return 0 != (fFlagBits & kNoColorWrites_StateBit);
}
bool isStateFlagEnabled(uint32_t stateBit) const {
return 0 != (stateBit & fFlagBits);
}
/// @}
///////////////////////////////////////////////////////////////////////////
/// @name Face Culling
////
enum DrawFace {
kInvalid_DrawFace = -1,
kBoth_DrawFace,
kCCW_DrawFace,
kCW_DrawFace,
};
/**
* Controls whether clockwise, counterclockwise, or both faces are drawn.
* @param face the face(s) to draw.
*/
void setDrawFace(DrawFace face) {
GrAssert(kInvalid_DrawFace != face);
fDrawFace = face;
}
/**
* Gets whether the target is drawing clockwise, counterclockwise,
* or both faces.
* @return the current draw face(s).
*/
DrawFace getDrawFace() const { return fDrawFace; }
/// @}
///////////////////////////////////////////////////////////////////////////
bool isStageEnabled(int s) const {
GrAssert((unsigned)s < kNumStages);
return (NULL != fSamplerStates[s].getCustomStage());
}
// Most stages are usually not used, so conditionals here
// reduce the expected number of bytes touched by 50%.
bool operator ==(const GrDrawState& s) const {
if (fColor != s.fColor ||
!s.fViewMatrix.cheapEqualTo(fViewMatrix) ||
fRenderTarget != s.fRenderTarget ||
fSrcBlend != s.fSrcBlend ||
fDstBlend != s.fDstBlend ||
fBlendConstant != s.fBlendConstant ||
fFlagBits != s.fFlagBits ||
fVertexEdgeType != s.fVertexEdgeType ||
fStencilSettings != s.fStencilSettings ||
fFirstCoverageStage != s.fFirstCoverageStage ||
fCoverage != s.fCoverage ||
fColorFilterMode != s.fColorFilterMode ||
fColorFilterColor != s.fColorFilterColor ||
fDrawFace != s.fDrawFace) {
return false;
}
for (int i = 0; i < kNumStages; i++) {
bool enabled = this->isStageEnabled(i);
if (enabled != s.isStageEnabled(i)) {
return false;
}
if (enabled && this->fSamplerStates[i] != s.fSamplerStates[i]) {
return false;
}
}
if (kColorMatrix_StateBit & s.fFlagBits) {
if (memcmp(fColorMatrix,
s.fColorMatrix,
sizeof(fColorMatrix))) {
return false;
}
}
return true;
}
bool operator !=(const GrDrawState& s) const { return !(*this == s); }
// Most stages are usually not used, so conditionals here
// reduce the expected number of bytes touched by 50%.
GrDrawState& operator =(const GrDrawState& s) {
fColor = s.fColor;
fViewMatrix = s.fViewMatrix;
SkRefCnt_SafeAssign(fRenderTarget, s.fRenderTarget);
fSrcBlend = s.fSrcBlend;
fDstBlend = s.fDstBlend;
fBlendConstant = s.fBlendConstant;
fFlagBits = s.fFlagBits;
fVertexEdgeType = s.fVertexEdgeType;
fStencilSettings = s.fStencilSettings;
fFirstCoverageStage = s.fFirstCoverageStage;
fCoverage = s.fCoverage;
fColorFilterMode = s.fColorFilterMode;
fColorFilterColor = s.fColorFilterColor;
fDrawFace = s.fDrawFace;
for (int i = 0; i < kNumStages; i++) {
if (s.isStageEnabled(i)) {
this->fSamplerStates[i] = s.fSamplerStates[i];
}
}
if (kColorMatrix_StateBit & s.fFlagBits) {
memcpy(this->fColorMatrix, s.fColorMatrix, sizeof(fColorMatrix));
}
return *this;
}
private:
// These fields are roughly sorted by decreasing likelihood of being different in op==
GrColor fColor;
GrMatrix fViewMatrix;
GrRenderTarget* fRenderTarget;
GrBlendCoeff fSrcBlend;
GrBlendCoeff fDstBlend;
GrColor fBlendConstant;
uint32_t fFlagBits;
VertexEdgeType fVertexEdgeType;
GrStencilSettings fStencilSettings;
int fFirstCoverageStage;
GrColor fCoverage;
SkXfermode::Mode fColorFilterMode;
GrColor fColorFilterColor;
DrawFace fDrawFace;
// This field must be last; it will not be copied or compared
// if the corresponding fTexture[] is NULL.
GrSamplerState fSamplerStates[kNumStages];
// only compared if the color matrix enable flag is set
float fColorMatrix[20]; // 5 x 4 matrix
typedef GrRefCnt INHERITED;
};
#endif