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/*
* 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 <utils/threads.h>
#include "Caches.h"
#include "Debug.h"
#include "GradientCache.h"
#include "Properties.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Defines
///////////////////////////////////////////////////////////////////////////////
#define GRADIENT_TEXTURE_HEIGHT 2
#define GRADIENT_BYTES_PER_PIXEL 4
///////////////////////////////////////////////////////////////////////////////
// Functions
///////////////////////////////////////////////////////////////////////////////
template<typename T>
static inline T min(T a, T b) {
return a < b ? a : b;
}
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
GradientCache::GradientCache():
mCache(GenerationCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity),
mSize(0), mMaxSize(MB(DEFAULT_GRADIENT_CACHE_SIZE)) {
char property[PROPERTY_VALUE_MAX];
if (property_get(PROPERTY_GRADIENT_CACHE_SIZE, property, NULL) > 0) {
INIT_LOGD(" Setting gradient cache size to %sMB", property);
setMaxSize(MB(atof(property)));
} else {
INIT_LOGD(" Using default gradient cache size of %.2fMB", DEFAULT_GRADIENT_CACHE_SIZE);
}
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
mCache.setOnEntryRemovedListener(this);
}
GradientCache::GradientCache(uint32_t maxByteSize):
mCache(GenerationCache<GradientCacheEntry, Texture*>::kUnlimitedCapacity),
mSize(0), mMaxSize(maxByteSize) {
mCache.setOnEntryRemovedListener(this);
}
GradientCache::~GradientCache() {
mCache.clear();
}
///////////////////////////////////////////////////////////////////////////////
// Size management
///////////////////////////////////////////////////////////////////////////////
uint32_t GradientCache::getSize() {
return mSize;
}
uint32_t GradientCache::getMaxSize() {
return mMaxSize;
}
void GradientCache::setMaxSize(uint32_t maxSize) {
mMaxSize = maxSize;
while (mSize > mMaxSize) {
mCache.removeOldest();
}
}
///////////////////////////////////////////////////////////////////////////////
// Callbacks
///////////////////////////////////////////////////////////////////////////////
void GradientCache::operator()(GradientCacheEntry& shader, Texture*& texture) {
if (texture) {
const uint32_t size = texture->width * texture->height * GRADIENT_BYTES_PER_PIXEL;
mSize -= size;
}
if (texture) {
glDeleteTextures(1, &texture->id);
delete texture;
}
}
///////////////////////////////////////////////////////////////////////////////
// Caching
///////////////////////////////////////////////////////////////////////////////
Texture* GradientCache::get(uint32_t* colors, float* positions, int count) {
GradientCacheEntry gradient(colors, positions, count);
Texture* texture = mCache.get(gradient);
if (!texture) {
texture = addLinearGradient(gradient, colors, positions, count);
}
return texture;
}
void GradientCache::clear() {
mCache.clear();
}
void GradientCache::getGradientInfo(const uint32_t* colors, const int count,
GradientInfo& info) {
uint32_t width = 256 * (count - 1);
if (!Caches::getInstance().extensions.hasNPot()) {
width = 1 << (31 - __builtin_clz(width));
}
bool hasAlpha = false;
for (int i = 0; i < count; i++) {
if (((colors[i] >> 24) & 0xff) < 255) {
hasAlpha = true;
break;
}
}
info.width = min(width, uint32_t(mMaxTextureSize));
info.hasAlpha = hasAlpha;
}
Texture* GradientCache::addLinearGradient(GradientCacheEntry& gradient,
uint32_t* colors, float* positions, int count) {
GradientInfo info;
getGradientInfo(colors, count, info);
Texture* texture = new Texture;
texture->width = info.width;
texture->height = GRADIENT_TEXTURE_HEIGHT;
texture->blend = info.hasAlpha;
texture->generation = 1;
// Asume the cache is always big enough
const uint32_t size = texture->width * texture->height * GRADIENT_BYTES_PER_PIXEL;
while (mSize + size > mMaxSize) {
mCache.removeOldest();
}
generateTexture(colors, positions, count, texture);
mSize += size;
mCache.put(gradient, texture);
return texture;
}
void GradientCache::generateTexture(uint32_t* colors, float* positions,
int count, Texture* texture) {
const uint32_t width = texture->width;
const GLsizei rowBytes = width * GRADIENT_BYTES_PER_PIXEL;
uint32_t pixels[width * texture->height];
int currentPos = 1;
float startA = (colors[0] >> 24) & 0xff;
float startR = (colors[0] >> 16) & 0xff;
float startG = (colors[0] >> 8) & 0xff;
float startB = (colors[0] >> 0) & 0xff;
float endA = (colors[1] >> 24) & 0xff;
float endR = (colors[1] >> 16) & 0xff;
float endG = (colors[1] >> 8) & 0xff;
float endB = (colors[1] >> 0) & 0xff;
float start = positions[0];
float distance = positions[1] - start;
uint8_t* p = (uint8_t*) pixels;
for (uint32_t x = 0; x < width; x++) {
float pos = x / float(width - 1);
if (pos > positions[currentPos]) {
startA = endA;
startR = endR;
startG = endG;
startB = endB;
start = positions[currentPos];
currentPos++;
endA = (colors[currentPos] >> 24) & 0xff;
endR = (colors[currentPos] >> 16) & 0xff;
endG = (colors[currentPos] >> 8) & 0xff;
endB = (colors[currentPos] >> 0) & 0xff;
distance = positions[currentPos] - start;
}
float amount = (pos - start) / distance;
float oppAmount = 1.0f - amount;
const float alpha = startA * oppAmount + endA * amount;
const float a = alpha / 255.0f;
*p++ = uint8_t(a * (startR * oppAmount + endR * amount));
*p++ = uint8_t(a * (startG * oppAmount + endG * amount));
*p++ = uint8_t(a * (startB * oppAmount + endB * amount));
*p++ = uint8_t(alpha);
}
for (int i = 1; i < GRADIENT_TEXTURE_HEIGHT; i++) {
memcpy(pixels + width * i, pixels, rowBytes);
}
glGenTextures(1, &texture->id);
glBindTexture(GL_TEXTURE_2D, texture->id);
glPixelStorei(GL_UNPACK_ALIGNMENT, GRADIENT_BYTES_PER_PIXEL);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, texture->height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, pixels);
texture->setFilter(GL_LINEAR);
texture->setWrap(GL_CLAMP_TO_EDGE);
}
}; // namespace uirenderer
}; // namespace android
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