src/gpu/GrAARectRenderer.cpp - platform/external/skia - Git at Google

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "GrAARectRenderer.h"
 #include "GrRefCnt.h"
 #include "GrGpu.h"

 SK_DEFINE_INST_COUNT(GrAARectRenderer)

 namespace {

 static GrVertexLayout aa_rect_layout(bool useCoverage) {
     GrVertexLayout layout = 0;
     if (useCoverage) {
         layout |= GrDrawState::kCoverage_VertexLayoutBit;
     } else {
         layout |= GrDrawState::kColor_VertexLayoutBit;
     }
     return layout;
 }

 static void set_inset_fan(GrPoint* pts, size_t stride,
                           const GrRect& r, SkScalar dx, SkScalar dy) {
     pts->setRectFan(r.fLeft + dx, r.fTop + dy,
                     r.fRight - dx, r.fBottom - dy, stride);
 }

 };

 void GrAARectRenderer::reset() {
     GrSafeSetNull(fAAFillRectIndexBuffer);
     GrSafeSetNull(fAAStrokeRectIndexBuffer);
 }

 static const uint16_t gFillAARectIdx[] = {
     0, 1, 5, 5, 4, 0,
     1, 2, 6, 6, 5, 1,
     2, 3, 7, 7, 6, 2,
     3, 0, 4, 4, 7, 3,
     4, 5, 6, 6, 7, 4,
 };

 static const int kIndicesPerAAFillRect = GR_ARRAY_COUNT(gFillAARectIdx);
 static const int kVertsPerAAFillRect = 8;
 static const int kNumAAFillRectsInIndexBuffer = 256;

 GrIndexBuffer* GrAARectRenderer::aaFillRectIndexBuffer(GrGpu* gpu) {
     static const size_t kAAFillRectIndexBufferSize = kIndicesPerAAFillRect *
                                                      sizeof(uint16_t) *
                                                      kNumAAFillRectsInIndexBuffer;

     if (NULL == fAAFillRectIndexBuffer) {
         fAAFillRectIndexBuffer = gpu->createIndexBuffer(kAAFillRectIndexBufferSize, false);
         if (NULL != fAAFillRectIndexBuffer) {
             uint16_t* data = (uint16_t*) fAAFillRectIndexBuffer->lock();
             bool useTempData = (NULL == data);
             if (useTempData) {
                 data = SkNEW_ARRAY(uint16_t, kNumAAFillRectsInIndexBuffer * kIndicesPerAAFillRect);
             }
             for (int i = 0; i < kNumAAFillRectsInIndexBuffer; ++i) {
                 // Each AA filled rect is drawn with 8 vertices and 10 triangles (8 around
                 // the inner rect (for AA) and 2 for the inner rect.
                 int baseIdx = i * kIndicesPerAAFillRect;
                 uint16_t baseVert = (uint16_t)(i * kVertsPerAAFillRect);
                 for (int j = 0; j < kIndicesPerAAFillRect; ++j) {
                     data[baseIdx+j] = baseVert + gFillAARectIdx[j];
                 }
             }
             if (useTempData) {
                 if (!fAAFillRectIndexBuffer->updateData(data, kAAFillRectIndexBufferSize)) {
                     GrCrash("Can't get AA Fill Rect indices into buffer!");
                 }
                 SkDELETE_ARRAY(data);
             } else {
                 fAAFillRectIndexBuffer->unlock();
             }
         }
     }

     return fAAFillRectIndexBuffer;
 }

 static const uint16_t gStrokeAARectIdx[] = {
     0 + 0, 1 + 0, 5 + 0, 5 + 0, 4 + 0, 0 + 0,
     1 + 0, 2 + 0, 6 + 0, 6 + 0, 5 + 0, 1 + 0,
     2 + 0, 3 + 0, 7 + 0, 7 + 0, 6 + 0, 2 + 0,
     3 + 0, 0 + 0, 4 + 0, 4 + 0, 7 + 0, 3 + 0,

     0 + 4, 1 + 4, 5 + 4, 5 + 4, 4 + 4, 0 + 4,
     1 + 4, 2 + 4, 6 + 4, 6 + 4, 5 + 4, 1 + 4,
     2 + 4, 3 + 4, 7 + 4, 7 + 4, 6 + 4, 2 + 4,
     3 + 4, 0 + 4, 4 + 4, 4 + 4, 7 + 4, 3 + 4,

     0 + 8, 1 + 8, 5 + 8, 5 + 8, 4 + 8, 0 + 8,
     1 + 8, 2 + 8, 6 + 8, 6 + 8, 5 + 8, 1 + 8,
     2 + 8, 3 + 8, 7 + 8, 7 + 8, 6 + 8, 2 + 8,
     3 + 8, 0 + 8, 4 + 8, 4 + 8, 7 + 8, 3 + 8,
 };

 int GrAARectRenderer::aaStrokeRectIndexCount() {
     return GR_ARRAY_COUNT(gStrokeAARectIdx);
 }

 GrIndexBuffer* GrAARectRenderer::aaStrokeRectIndexBuffer(GrGpu* gpu) {
     if (NULL == fAAStrokeRectIndexBuffer) {
         fAAStrokeRectIndexBuffer =
                   gpu->createIndexBuffer(sizeof(gStrokeAARectIdx), false);
         if (NULL != fAAStrokeRectIndexBuffer) {
 #if GR_DEBUG
             bool updated =
 #endif
             fAAStrokeRectIndexBuffer->updateData(gStrokeAARectIdx,
                                                  sizeof(gStrokeAARectIdx));
             GR_DEBUGASSERT(updated);
         }
     }
     return fAAStrokeRectIndexBuffer;
 }

 void GrAARectRenderer::fillAARect(GrGpu* gpu,
                                   GrDrawTarget* target,
                                   const GrRect& devRect,
                                   bool useVertexCoverage) {
     GrVertexLayout layout = aa_rect_layout(useVertexCoverage);

     size_t vsize = GrDrawState::VertexSize(layout);

     GrDrawTarget::AutoReleaseGeometry geo(target, layout, 8, 0);
     if (!geo.succeeded()) {
         GrPrintf("Failed to get space for vertices!\n");
         return;
     }

     GrIndexBuffer* indexBuffer = this->aaFillRectIndexBuffer(gpu);
     if (NULL == indexBuffer) {
         GrPrintf("Failed to create index buffer!\n");
         return;
     }

     intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());

     GrPoint* fan0Pos = reinterpret_cast<GrPoint*>(verts);
     GrPoint* fan1Pos = reinterpret_cast<GrPoint*>(verts + 4 * vsize);

     set_inset_fan(fan0Pos, vsize, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
     set_inset_fan(fan1Pos, vsize, devRect,  SK_ScalarHalf,  SK_ScalarHalf);

     verts += sizeof(GrPoint);
     for (int i = 0; i < 4; ++i) {
         *reinterpret_cast<GrColor*>(verts + i * vsize) = 0;
     }

     GrColor innerColor;
     if (useVertexCoverage) {
         innerColor = 0xffffffff;
     } else {
         innerColor = target->getDrawState().getColor();
     }

     verts += 4 * vsize;
     for (int i = 0; i < 4; ++i) {
         *reinterpret_cast<GrColor*>(verts + i * vsize) = innerColor;
     }

     target->setIndexSourceToBuffer(indexBuffer);
     target->drawIndexedInstances(kTriangles_GrPrimitiveType, 1,
                                  kVertsPerAAFillRect,
                                  kIndicesPerAAFillRect);
 }

 void GrAARectRenderer::strokeAARect(GrGpu* gpu,
                                     GrDrawTarget* target,
                                     const GrRect& devRect,
                                     const GrVec& devStrokeSize,
                                     bool useVertexCoverage) {
     const SkScalar& dx = devStrokeSize.fX;
     const SkScalar& dy = devStrokeSize.fY;
     const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
     const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);

     SkScalar spare;
     {
         SkScalar w = devRect.width() - dx;
         SkScalar h = devRect.height() - dy;
         spare = GrMin(w, h);
     }

     if (spare <= 0) {
         GrRect r(devRect);
         r.inset(-rx, -ry);
         this->fillAARect(gpu, target, r, useVertexCoverage);
         return;
     }
     GrVertexLayout layout = aa_rect_layout(useVertexCoverage);
     size_t vsize = GrDrawState::VertexSize(layout);

     GrDrawTarget::AutoReleaseGeometry geo(target, layout, 16, 0);
     if (!geo.succeeded()) {
         GrPrintf("Failed to get space for vertices!\n");
         return;
     }
     GrIndexBuffer* indexBuffer = this->aaStrokeRectIndexBuffer(gpu);
     if (NULL == indexBuffer) {
         GrPrintf("Failed to create index buffer!\n");
         return;
     }

     intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());

     // We create vertices for four nested rectangles. There are two ramps from 0 to full
     // coverage, one on the exterior of the stroke and the other on the interior.
     // The following pointers refer to the four rects, from outermost to innermost.
     GrPoint* fan0Pos = reinterpret_cast<GrPoint*>(verts);
     GrPoint* fan1Pos = reinterpret_cast<GrPoint*>(verts + 4 * vsize);
     GrPoint* fan2Pos = reinterpret_cast<GrPoint*>(verts + 8 * vsize);
     GrPoint* fan3Pos = reinterpret_cast<GrPoint*>(verts + 12 * vsize);

     set_inset_fan(fan0Pos, vsize, devRect,
                   -rx - SK_ScalarHalf, -ry - SK_ScalarHalf);
     set_inset_fan(fan1Pos, vsize, devRect,
                   -rx + SK_ScalarHalf, -ry + SK_ScalarHalf);
     set_inset_fan(fan2Pos, vsize, devRect,
                   rx - SK_ScalarHalf,  ry - SK_ScalarHalf);
     set_inset_fan(fan3Pos, vsize, devRect,
                   rx + SK_ScalarHalf,  ry + SK_ScalarHalf);

     // The outermost rect has 0 coverage
     verts += sizeof(GrPoint);
     for (int i = 0; i < 4; ++i) {
         *reinterpret_cast<GrColor*>(verts + i * vsize) = 0;
     }

     // The inner two rects have full coverage
     GrColor innerColor;
     if (useVertexCoverage) {
         innerColor = 0xffffffff;
     } else {
         innerColor = target->getDrawState().getColor();
     }
     verts += 4 * vsize;
     for (int i = 0; i < 8; ++i) {
         *reinterpret_cast<GrColor*>(verts + i * vsize) = innerColor;
     }

     // The innermost rect has full coverage
     verts += 8 * vsize;
     for (int i = 0; i < 4; ++i) {
         *reinterpret_cast<GrColor*>(verts + i * vsize) = 0;
     }

     target->setIndexSourceToBuffer(indexBuffer);
     target->drawIndexed(kTriangles_GrPrimitiveType,
                         0, 0, 16, aaStrokeRectIndexCount());
 }
	/*
	* Copyright 2012 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "GrAARectRenderer.h"
	#include "GrRefCnt.h"
	#include "GrGpu.h"

	SK_DEFINE_INST_COUNT(GrAARectRenderer)

	namespace {

	static GrVertexLayout aa_rect_layout(bool useCoverage) {
	GrVertexLayout layout = 0;
	if (useCoverage) {
	layout \|= GrDrawState::kCoverage_VertexLayoutBit;
	} else {
	layout \|= GrDrawState::kColor_VertexLayoutBit;
	}
	return layout;
	}

	static void set_inset_fan(GrPoint* pts, size_t stride,
	const GrRect& r, SkScalar dx, SkScalar dy) {
	pts->setRectFan(r.fLeft + dx, r.fTop + dy,
	r.fRight - dx, r.fBottom - dy, stride);
	}

	};

	void GrAARectRenderer::reset() {
	GrSafeSetNull(fAAFillRectIndexBuffer);
	GrSafeSetNull(fAAStrokeRectIndexBuffer);
	}

	static const uint16_t gFillAARectIdx[] = {
	0, 1, 5, 5, 4, 0,
	1, 2, 6, 6, 5, 1,
	2, 3, 7, 7, 6, 2,
	3, 0, 4, 4, 7, 3,
	4, 5, 6, 6, 7, 4,
	};

	static const int kIndicesPerAAFillRect = GR_ARRAY_COUNT(gFillAARectIdx);
	static const int kVertsPerAAFillRect = 8;
	static const int kNumAAFillRectsInIndexBuffer = 256;

	GrIndexBuffer* GrAARectRenderer::aaFillRectIndexBuffer(GrGpu* gpu) {
	static const size_t kAAFillRectIndexBufferSize = kIndicesPerAAFillRect *
	sizeof(uint16_t) *
	kNumAAFillRectsInIndexBuffer;

	if (NULL == fAAFillRectIndexBuffer) {
	fAAFillRectIndexBuffer = gpu->createIndexBuffer(kAAFillRectIndexBufferSize, false);
	if (NULL != fAAFillRectIndexBuffer) {
	uint16_t* data = (uint16_t*) fAAFillRectIndexBuffer->lock();
	bool useTempData = (NULL == data);
	if (useTempData) {
	data = SkNEW_ARRAY(uint16_t, kNumAAFillRectsInIndexBuffer * kIndicesPerAAFillRect);
	}
	for (int i = 0; i < kNumAAFillRectsInIndexBuffer; ++i) {
	// Each AA filled rect is drawn with 8 vertices and 10 triangles (8 around
	// the inner rect (for AA) and 2 for the inner rect.
	int baseIdx = i * kIndicesPerAAFillRect;
	uint16_t baseVert = (uint16_t)(i * kVertsPerAAFillRect);
	for (int j = 0; j < kIndicesPerAAFillRect; ++j) {
	data[baseIdx+j] = baseVert + gFillAARectIdx[j];
	}
	}
	if (useTempData) {
	if (!fAAFillRectIndexBuffer->updateData(data, kAAFillRectIndexBufferSize)) {
	GrCrash("Can't get AA Fill Rect indices into buffer!");
	}
	SkDELETE_ARRAY(data);
	} else {
	fAAFillRectIndexBuffer->unlock();
	}
	}
	}

	return fAAFillRectIndexBuffer;
	}

	static const uint16_t gStrokeAARectIdx[] = {
	0 + 0, 1 + 0, 5 + 0, 5 + 0, 4 + 0, 0 + 0,
	1 + 0, 2 + 0, 6 + 0, 6 + 0, 5 + 0, 1 + 0,
	2 + 0, 3 + 0, 7 + 0, 7 + 0, 6 + 0, 2 + 0,
	3 + 0, 0 + 0, 4 + 0, 4 + 0, 7 + 0, 3 + 0,

	0 + 4, 1 + 4, 5 + 4, 5 + 4, 4 + 4, 0 + 4,
	1 + 4, 2 + 4, 6 + 4, 6 + 4, 5 + 4, 1 + 4,
	2 + 4, 3 + 4, 7 + 4, 7 + 4, 6 + 4, 2 + 4,
	3 + 4, 0 + 4, 4 + 4, 4 + 4, 7 + 4, 3 + 4,

	0 + 8, 1 + 8, 5 + 8, 5 + 8, 4 + 8, 0 + 8,
	1 + 8, 2 + 8, 6 + 8, 6 + 8, 5 + 8, 1 + 8,
	2 + 8, 3 + 8, 7 + 8, 7 + 8, 6 + 8, 2 + 8,
	3 + 8, 0 + 8, 4 + 8, 4 + 8, 7 + 8, 3 + 8,
	};

	int GrAARectRenderer::aaStrokeRectIndexCount() {
	return GR_ARRAY_COUNT(gStrokeAARectIdx);
	}

	GrIndexBuffer* GrAARectRenderer::aaStrokeRectIndexBuffer(GrGpu* gpu) {
	if (NULL == fAAStrokeRectIndexBuffer) {
	fAAStrokeRectIndexBuffer =
	gpu->createIndexBuffer(sizeof(gStrokeAARectIdx), false);
	if (NULL != fAAStrokeRectIndexBuffer) {
	#if GR_DEBUG
	bool updated =
	#endif
	fAAStrokeRectIndexBuffer->updateData(gStrokeAARectIdx,
	sizeof(gStrokeAARectIdx));
	GR_DEBUGASSERT(updated);
	}
	}
	return fAAStrokeRectIndexBuffer;
	}

	void GrAARectRenderer::fillAARect(GrGpu* gpu,
	GrDrawTarget* target,
	const GrRect& devRect,
	bool useVertexCoverage) {
	GrVertexLayout layout = aa_rect_layout(useVertexCoverage);

	size_t vsize = GrDrawState::VertexSize(layout);

	GrDrawTarget::AutoReleaseGeometry geo(target, layout, 8, 0);
	if (!geo.succeeded()) {
	GrPrintf("Failed to get space for vertices!\n");
	return;
	}

	GrIndexBuffer* indexBuffer = this->aaFillRectIndexBuffer(gpu);
	if (NULL == indexBuffer) {
	GrPrintf("Failed to create index buffer!\n");
	return;
	}

	intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());

	GrPoint* fan0Pos = reinterpret_cast<GrPoint*>(verts);
	GrPoint* fan1Pos = reinterpret_cast<GrPoint>(verts + 4 vsize);

	set_inset_fan(fan0Pos, vsize, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
	set_inset_fan(fan1Pos, vsize, devRect, SK_ScalarHalf, SK_ScalarHalf);

	verts += sizeof(GrPoint);
	for (int i = 0; i < 4; ++i) {
	reinterpret_cast<GrColor>(verts + i * vsize) = 0;
	}

	GrColor innerColor;
	if (useVertexCoverage) {
	innerColor = 0xffffffff;
	} else {
	innerColor = target->getDrawState().getColor();
	}

	verts += 4 * vsize;
	for (int i = 0; i < 4; ++i) {
	reinterpret_cast<GrColor>(verts + i * vsize) = innerColor;
	}

	target->setIndexSourceToBuffer(indexBuffer);
	target->drawIndexedInstances(kTriangles_GrPrimitiveType, 1,
	kVertsPerAAFillRect,
	kIndicesPerAAFillRect);
	}

	void GrAARectRenderer::strokeAARect(GrGpu* gpu,
	GrDrawTarget* target,
	const GrRect& devRect,
	const GrVec& devStrokeSize,
	bool useVertexCoverage) {
	const SkScalar& dx = devStrokeSize.fX;
	const SkScalar& dy = devStrokeSize.fY;
	const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
	const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);

	SkScalar spare;
	{
	SkScalar w = devRect.width() - dx;
	SkScalar h = devRect.height() - dy;
	spare = GrMin(w, h);
	}

	if (spare <= 0) {
	GrRect r(devRect);
	r.inset(-rx, -ry);
	this->fillAARect(gpu, target, r, useVertexCoverage);
	return;
	}
	GrVertexLayout layout = aa_rect_layout(useVertexCoverage);
	size_t vsize = GrDrawState::VertexSize(layout);

	GrDrawTarget::AutoReleaseGeometry geo(target, layout, 16, 0);
	if (!geo.succeeded()) {
	GrPrintf("Failed to get space for vertices!\n");
	return;
	}
	GrIndexBuffer* indexBuffer = this->aaStrokeRectIndexBuffer(gpu);
	if (NULL == indexBuffer) {
	GrPrintf("Failed to create index buffer!\n");
	return;
	}

	intptr_t verts = reinterpret_cast<intptr_t>(geo.vertices());

	// We create vertices for four nested rectangles. There are two ramps from 0 to full
	// coverage, one on the exterior of the stroke and the other on the interior.
	// The following pointers refer to the four rects, from outermost to innermost.
	GrPoint* fan0Pos = reinterpret_cast<GrPoint*>(verts);
	GrPoint* fan1Pos = reinterpret_cast<GrPoint>(verts + 4 vsize);
	GrPoint* fan2Pos = reinterpret_cast<GrPoint>(verts + 8 vsize);
	GrPoint* fan3Pos = reinterpret_cast<GrPoint>(verts + 12 vsize);

	set_inset_fan(fan0Pos, vsize, devRect,
	-rx - SK_ScalarHalf, -ry - SK_ScalarHalf);
	set_inset_fan(fan1Pos, vsize, devRect,
	-rx + SK_ScalarHalf, -ry + SK_ScalarHalf);
	set_inset_fan(fan2Pos, vsize, devRect,
	rx - SK_ScalarHalf, ry - SK_ScalarHalf);
	set_inset_fan(fan3Pos, vsize, devRect,
	rx + SK_ScalarHalf, ry + SK_ScalarHalf);

	// The outermost rect has 0 coverage
	verts += sizeof(GrPoint);
	for (int i = 0; i < 4; ++i) {
	reinterpret_cast<GrColor>(verts + i * vsize) = 0;
	}

	// The inner two rects have full coverage
	GrColor innerColor;
	if (useVertexCoverage) {
	innerColor = 0xffffffff;
	} else {
	innerColor = target->getDrawState().getColor();
	}
	verts += 4 * vsize;
	for (int i = 0; i < 8; ++i) {
	reinterpret_cast<GrColor>(verts + i * vsize) = innerColor;
	}

	// The innermost rect has full coverage
	verts += 8 * vsize;
	for (int i = 0; i < 4; ++i) {
	reinterpret_cast<GrColor>(verts + i * vsize) = 0;
	}

	target->setIndexSourceToBuffer(indexBuffer);
	target->drawIndexed(kTriangles_GrPrimitiveType,
	0, 0, 16, aaStrokeRectIndexCount());
	}