libs/hwui/Patch.cpp - platform/frameworks/base - Gitiles

 /*
  * Copyright (C) 2010 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #define LOG_TAG "OpenGLRenderer"

 #include <cmath>

 #include <utils/Log.h>

 #include "Patch.h"
 #include "Caches.h"
 #include "Properties.h"

 namespace android {
 namespace uirenderer {

 ///////////////////////////////////////////////////////////////////////////////
 // Constructors/destructor
 ///////////////////////////////////////////////////////////////////////////////

 Patch::Patch(const uint32_t xCount, const uint32_t yCount, const int8_t emptyQuads):
         mXCount(xCount), mYCount(yCount), mEmptyQuads(emptyQuads) {
     // Initialized with the maximum number of vertices we will need
     // 2 triangles per patch, 3 vertices per triangle
     uint32_t maxVertices = ((xCount + 1) * (yCount + 1) - emptyQuads) * 2 * 3;
     mVertices = new TextureVertex[maxVertices];
     mUploaded = false;

     verticesCount = 0;
     hasEmptyQuads = emptyQuads > 0;

     mColorKey = 0;
     mXDivs = new int32_t[mXCount];
     mYDivs = new int32_t[mYCount];

     PATCH_LOGD("    patch: xCount = %d, yCount = %d, emptyQuads = %d, max vertices = %d",
             xCount, yCount, emptyQuads, maxVertices);

     glGenBuffers(1, &meshBuffer);
 }

 Patch::~Patch() {
     delete[] mVertices;
     delete[] mXDivs;
     delete[] mYDivs;
     glDeleteBuffers(1, &meshBuffer);
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Patch management
 ///////////////////////////////////////////////////////////////////////////////

 void Patch::copy(const int32_t* xDivs, const int32_t* yDivs) {
     memcpy(mXDivs, xDivs, mXCount * sizeof(int32_t));
     memcpy(mYDivs, yDivs, mYCount * sizeof(int32_t));
 }

 void Patch::copy(const int32_t* yDivs) {
     memcpy(mYDivs, yDivs, mYCount * sizeof(int32_t));
 }

 void Patch::updateColorKey(const uint32_t colorKey) {
     mColorKey = colorKey;
 }

 bool Patch::matches(const int32_t* xDivs, const int32_t* yDivs, const uint32_t colorKey) {
     if (mColorKey != colorKey) {
         updateColorKey(colorKey);
         copy(xDivs, yDivs);
         return false;
     }

     for (uint32_t i = 0; i < mXCount; i++) {
         if (mXDivs[i] != xDivs[i]) {
             // The Y divs may or may not match, copy everything
             copy(xDivs, yDivs);
             return false;
         }
     }

     for (uint32_t i = 0; i < mYCount; i++) {
         if (mYDivs[i] != yDivs[i]) {
             // We know all the X divs match, copy only Y divs
             copy(yDivs);
             return false;
         }
     }

     return true;
 }

 ///////////////////////////////////////////////////////////////////////////////
 // Vertices management
 ///////////////////////////////////////////////////////////////////////////////

 void Patch::updateVertices(const float bitmapWidth, const float bitmapHeight,
         float left, float top, float right, float bottom) {
 #if RENDER_LAYERS_AS_REGIONS
     if (hasEmptyQuads) quads.clear();
 #endif

     // Reset the vertices count here, we will count exactly how many
     // vertices we actually need when generating the quads
     verticesCount = 0;

     const uint32_t xStretchCount = (mXCount + 1) >> 1;
     const uint32_t yStretchCount = (mYCount + 1) >> 1;

     float stretchX = 0.0f;
     float stretchY = 0.0;

     const float meshWidth = right - left;

     if (xStretchCount > 0) {
         uint32_t stretchSize = 0;
         for (uint32_t i = 1; i < mXCount; i += 2) {
             stretchSize += mXDivs[i] - mXDivs[i - 1];
         }
         const float xStretchTex = stretchSize;
         const float fixed = bitmapWidth - stretchSize;
         const float xStretch = right - left - fixed;
         stretchX = xStretch / xStretchTex;
     }

     if (yStretchCount > 0) {
         uint32_t stretchSize = 0;
         for (uint32_t i = 1; i < mYCount; i += 2) {
             stretchSize += mYDivs[i] - mYDivs[i - 1];
         }
         const float yStretchTex = stretchSize;
         const float fixed = bitmapHeight - stretchSize;
         const float yStretch = bottom - top - fixed;
         stretchY = yStretch / yStretchTex;
     }

     TextureVertex* vertex = mVertices;
     uint32_t quadCount = 0;

     float previousStepY = 0.0f;

     float y1 = 0.0f;
     float v1 = 0.0f;

     for (uint32_t i = 0; i < mYCount; i++) {
         float stepY = mYDivs[i];

         float y2 = 0.0f;
         if (i & 1) {
             const float segment = stepY - previousStepY;
             y2 = y1 + floorf(segment * stretchY + 0.5f);
         } else {
             y2 = y1 + stepY - previousStepY;
         }
         float v2 = fmax(0.0f, stepY - 0.5f) / bitmapHeight;

         if (stepY > 0.0f) {
             generateRow(vertex, y1, y2, v1, v2, stretchX, right - left,
                     bitmapWidth, quadCount);
         }

         y1 = y2;
         v1 = (stepY + 0.5f) / bitmapHeight;

         previousStepY = stepY;
     }

     if (previousStepY != bitmapHeight) {
         generateRow(vertex, y1, bottom - top, v1, 1.0f, stretchX, right - left,
                 bitmapWidth, quadCount);
     }

     if (verticesCount > 0) {
         Caches::getInstance().bindMeshBuffer(meshBuffer);
         if (!mUploaded) {
             glBufferData(GL_ARRAY_BUFFER, sizeof(TextureVertex) * verticesCount,
                     mVertices, GL_DYNAMIC_DRAW);
             mUploaded = true;
         } else {
             glBufferSubData(GL_ARRAY_BUFFER, 0,
                     sizeof(TextureVertex) * verticesCount, mVertices);
         }
     }

     PATCH_LOGD("    patch: new vertices count = %d", verticesCount);
 }

 void Patch::generateRow(TextureVertex*& vertex, float y1, float y2, float v1, float v2,
         float stretchX, float width, float bitmapWidth, uint32_t& quadCount) {
     float previousStepX = 0.0f;

     float x1 = 0.0f;
     float u1 = 0.0f;

     // Generate the row quad by quad
     for (uint32_t i = 0; i < mXCount; i++) {
         float stepX = mXDivs[i];

         float x2 = 0.0f;
         if (i & 1) {
             const float segment = stepX - previousStepX;
             x2 = x1 + floorf(segment * stretchX + 0.5f);
         } else {
             x2 = x1 + stepX - previousStepX;
         }
         float u2 = fmax(0.0f, stepX - 0.5f) / bitmapWidth;

         if (stepX > 0.0f) {
             generateQuad(vertex, x1, y1, x2, y2, u1, v1, u2, v2, quadCount);
         }

         x1 = x2;
         u1 = (stepX + 0.5f) / bitmapWidth;

         previousStepX = stepX;
     }

     if (previousStepX != bitmapWidth) {
         generateQuad(vertex, x1, y1, width, y2, u1, v1, 1.0f, v2, quadCount);
     }
 }

 void Patch::generateQuad(TextureVertex*& vertex, float x1, float y1, float x2, float y2,
             float u1, float v1, float u2, float v2, uint32_t& quadCount) {
     const uint32_t oldQuadCount = quadCount;
     quadCount++;

     // Skip degenerate and transparent (empty) quads
     if ((mColorKey >> oldQuadCount) & 0x1) {
 #if DEBUG_PATCHES_EMPTY_VERTICES
         PATCH_LOGD("    quad %d (empty)", oldQuadCount);
         PATCH_LOGD("        left,  top    = %.2f, %.2f\t\tu1, v1 = %.2f, %.2f", x1, y1, u1, v1);
         PATCH_LOGD("        right, bottom = %.2f, %.2f\t\tu2, v2 = %.2f, %.2f", x2, y2, u2, v2);
 #endif
         return;
     }

 #if RENDER_LAYERS_AS_REGIONS
     // Record all non empty quads
     if (hasEmptyQuads) {
         Rect bounds(x1, y1, x2, y2);
         quads.add(bounds);
     }
 #endif

     // Left triangle
     TextureVertex::set(vertex++, x1, y1, u1, v1);
     TextureVertex::set(vertex++, x2, y1, u2, v1);
     TextureVertex::set(vertex++, x1, y2, u1, v2);

     // Right triangle
     TextureVertex::set(vertex++, x1, y2, u1, v2);
     TextureVertex::set(vertex++, x2, y1, u2, v1);
     TextureVertex::set(vertex++, x2, y2, u2, v2);

     // A quad is made of 2 triangles, 6 vertices
     verticesCount += 6;

 #if DEBUG_PATCHES_VERTICES
     PATCH_LOGD("    quad %d", oldQuadCount);
     PATCH_LOGD("        left,  top    = %.2f, %.2f\t\tu1, v1 = %.2f, %.2f", x1, y1, u1, v1);
     PATCH_LOGD("        right, bottom = %.2f, %.2f\t\tu2, v2 = %.2f, %.2f", x2, y2, u2, v2);
 #endif
 }

 }; // namespace uirenderer
 }; // namespace android
	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#define LOG_TAG "OpenGLRenderer"

	#include <cmath>

	#include <utils/Log.h>

	#include "Patch.h"
	#include "Caches.h"
	#include "Properties.h"

	namespace android {
	namespace uirenderer {

	///////////////////////////////////////////////////////////////////////////////
	// Constructors/destructor
	///////////////////////////////////////////////////////////////////////////////

	Patch::Patch(const uint32_t xCount, const uint32_t yCount, const int8_t emptyQuads):
	mXCount(xCount), mYCount(yCount), mEmptyQuads(emptyQuads) {
	// Initialized with the maximum number of vertices we will need
	// 2 triangles per patch, 3 vertices per triangle
	uint32_t maxVertices = ((xCount + 1) * (yCount + 1) - emptyQuads) * 2 * 3;
	mVertices = new TextureVertex[maxVertices];
	mUploaded = false;

	verticesCount = 0;
	hasEmptyQuads = emptyQuads > 0;

	mColorKey = 0;
	mXDivs = new int32_t[mXCount];
	mYDivs = new int32_t[mYCount];

	PATCH_LOGD(" patch: xCount = %d, yCount = %d, emptyQuads = %d, max vertices = %d",
	xCount, yCount, emptyQuads, maxVertices);

	glGenBuffers(1, &meshBuffer);
	}

	Patch::~Patch() {
	delete[] mVertices;
	delete[] mXDivs;
	delete[] mYDivs;
	glDeleteBuffers(1, &meshBuffer);
	}

	///////////////////////////////////////////////////////////////////////////////
	// Patch management
	///////////////////////////////////////////////////////////////////////////////

	void Patch::copy(const int32_t* xDivs, const int32_t* yDivs) {
	memcpy(mXDivs, xDivs, mXCount * sizeof(int32_t));
	memcpy(mYDivs, yDivs, mYCount * sizeof(int32_t));
	}

	void Patch::copy(const int32_t* yDivs) {
	memcpy(mYDivs, yDivs, mYCount * sizeof(int32_t));
	}

	void Patch::updateColorKey(const uint32_t colorKey) {
	mColorKey = colorKey;
	}

	bool Patch::matches(const int32_t* xDivs, const int32_t* yDivs, const uint32_t colorKey) {
	if (mColorKey != colorKey) {
	updateColorKey(colorKey);
	copy(xDivs, yDivs);
	return false;
	}

	for (uint32_t i = 0; i < mXCount; i++) {
	if (mXDivs[i] != xDivs[i]) {
	// The Y divs may or may not match, copy everything
	copy(xDivs, yDivs);
	return false;
	}
	}

	for (uint32_t i = 0; i < mYCount; i++) {
	if (mYDivs[i] != yDivs[i]) {
	// We know all the X divs match, copy only Y divs
	copy(yDivs);
	return false;
	}
	}

	return true;
	}

	///////////////////////////////////////////////////////////////////////////////
	// Vertices management
	///////////////////////////////////////////////////////////////////////////////

	void Patch::updateVertices(const float bitmapWidth, const float bitmapHeight,
	float left, float top, float right, float bottom) {
	#if RENDER_LAYERS_AS_REGIONS
	if (hasEmptyQuads) quads.clear();
	#endif

	// Reset the vertices count here, we will count exactly how many
	// vertices we actually need when generating the quads
	verticesCount = 0;

	const uint32_t xStretchCount = (mXCount + 1) >> 1;
	const uint32_t yStretchCount = (mYCount + 1) >> 1;

	float stretchX = 0.0f;
	float stretchY = 0.0;

	const float meshWidth = right - left;

	if (xStretchCount > 0) {
	uint32_t stretchSize = 0;
	for (uint32_t i = 1; i < mXCount; i += 2) {
	stretchSize += mXDivs[i] - mXDivs[i - 1];
	}
	const float xStretchTex = stretchSize;
	const float fixed = bitmapWidth - stretchSize;
	const float xStretch = right - left - fixed;
	stretchX = xStretch / xStretchTex;
	}

	if (yStretchCount > 0) {
	uint32_t stretchSize = 0;
	for (uint32_t i = 1; i < mYCount; i += 2) {
	stretchSize += mYDivs[i] - mYDivs[i - 1];
	}
	const float yStretchTex = stretchSize;
	const float fixed = bitmapHeight - stretchSize;
	const float yStretch = bottom - top - fixed;
	stretchY = yStretch / yStretchTex;
	}

	TextureVertex* vertex = mVertices;
	uint32_t quadCount = 0;

	float previousStepY = 0.0f;

	float y1 = 0.0f;
	float v1 = 0.0f;

	for (uint32_t i = 0; i < mYCount; i++) {
	float stepY = mYDivs[i];

	float y2 = 0.0f;
	if (i & 1) {
	const float segment = stepY - previousStepY;
	y2 = y1 + floorf(segment * stretchY + 0.5f);
	} else {
	y2 = y1 + stepY - previousStepY;
	}
	float v2 = fmax(0.0f, stepY - 0.5f) / bitmapHeight;

	if (stepY > 0.0f) {
	generateRow(vertex, y1, y2, v1, v2, stretchX, right - left,
	bitmapWidth, quadCount);
	}

	y1 = y2;
	v1 = (stepY + 0.5f) / bitmapHeight;

	previousStepY = stepY;
	}

	if (previousStepY != bitmapHeight) {
	generateRow(vertex, y1, bottom - top, v1, 1.0f, stretchX, right - left,
	bitmapWidth, quadCount);
	}

	if (verticesCount > 0) {
	Caches::getInstance().bindMeshBuffer(meshBuffer);
	if (!mUploaded) {
	glBufferData(GL_ARRAY_BUFFER, sizeof(TextureVertex) * verticesCount,
	mVertices, GL_DYNAMIC_DRAW);
	mUploaded = true;
	} else {
	glBufferSubData(GL_ARRAY_BUFFER, 0,
	sizeof(TextureVertex) * verticesCount, mVertices);
	}
	}

	PATCH_LOGD(" patch: new vertices count = %d", verticesCount);
	}

	void Patch::generateRow(TextureVertex*& vertex, float y1, float y2, float v1, float v2,
	float stretchX, float width, float bitmapWidth, uint32_t& quadCount) {
	float previousStepX = 0.0f;

	float x1 = 0.0f;
	float u1 = 0.0f;

	// Generate the row quad by quad
	for (uint32_t i = 0; i < mXCount; i++) {
	float stepX = mXDivs[i];

	float x2 = 0.0f;
	if (i & 1) {
	const float segment = stepX - previousStepX;
	x2 = x1 + floorf(segment * stretchX + 0.5f);
	} else {
	x2 = x1 + stepX - previousStepX;
	}
	float u2 = fmax(0.0f, stepX - 0.5f) / bitmapWidth;

	if (stepX > 0.0f) {
	generateQuad(vertex, x1, y1, x2, y2, u1, v1, u2, v2, quadCount);
	}

	x1 = x2;
	u1 = (stepX + 0.5f) / bitmapWidth;

	previousStepX = stepX;
	}

	if (previousStepX != bitmapWidth) {
	generateQuad(vertex, x1, y1, width, y2, u1, v1, 1.0f, v2, quadCount);
	}
	}

	void Patch::generateQuad(TextureVertex*& vertex, float x1, float y1, float x2, float y2,
	float u1, float v1, float u2, float v2, uint32_t& quadCount) {
	const uint32_t oldQuadCount = quadCount;
	quadCount++;

	// Skip degenerate and transparent (empty) quads
	if ((mColorKey >> oldQuadCount) & 0x1) {
	#if DEBUG_PATCHES_EMPTY_VERTICES
	PATCH_LOGD(" quad %d (empty)", oldQuadCount);
	PATCH_LOGD(" left, top = %.2f, %.2f\t\tu1, v1 = %.2f, %.2f", x1, y1, u1, v1);
	PATCH_LOGD(" right, bottom = %.2f, %.2f\t\tu2, v2 = %.2f, %.2f", x2, y2, u2, v2);
	#endif
	return;
	}

	#if RENDER_LAYERS_AS_REGIONS
	// Record all non empty quads
	if (hasEmptyQuads) {
	Rect bounds(x1, y1, x2, y2);
	quads.add(bounds);
	}
	#endif

	// Left triangle
	TextureVertex::set(vertex++, x1, y1, u1, v1);
	TextureVertex::set(vertex++, x2, y1, u2, v1);
	TextureVertex::set(vertex++, x1, y2, u1, v2);

	// Right triangle
	TextureVertex::set(vertex++, x1, y2, u1, v2);
	TextureVertex::set(vertex++, x2, y1, u2, v1);
	TextureVertex::set(vertex++, x2, y2, u2, v2);

	// A quad is made of 2 triangles, 6 vertices
	verticesCount += 6;

	#if DEBUG_PATCHES_VERTICES
	PATCH_LOGD(" quad %d", oldQuadCount);
	PATCH_LOGD(" left, top = %.2f, %.2f\t\tu1, v1 = %.2f, %.2f", x1, y1, u1, v1);
	PATCH_LOGD(" right, bottom = %.2f, %.2f\t\tu2, v2 = %.2f, %.2f", x2, y2, u2, v2);
	#endif
	}

	}; // namespace uirenderer
	}; // namespace android