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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 "Debug.h"
#include "GammaFontRenderer.h"
#include "Properties.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Constructors/destructor
///////////////////////////////////////////////////////////////////////////////
GammaFontRenderer::GammaFontRenderer() {
INIT_LOGD("Creating gamma font renderer");
// Get the renderer properties
char property[PROPERTY_VALUE_MAX];
// Get the gamma
float gamma = DEFAULT_TEXT_GAMMA;
if (property_get(PROPERTY_TEXT_GAMMA, property, NULL) > 0) {
INIT_LOGD(" Setting text gamma to %s", property);
gamma = atof(property);
} else {
INIT_LOGD(" Using default text gamma of %.2f", DEFAULT_TEXT_GAMMA);
}
// Get the black gamma threshold
mBlackThreshold = DEFAULT_TEXT_BLACK_GAMMA_THRESHOLD;
if (property_get(PROPERTY_TEXT_BLACK_GAMMA_THRESHOLD, property, NULL) > 0) {
INIT_LOGD(" Setting text black gamma threshold to %s", property);
mBlackThreshold = atoi(property);
} else {
INIT_LOGD(" Using default text black gamma threshold of %d",
DEFAULT_TEXT_BLACK_GAMMA_THRESHOLD);
}
// Get the white gamma threshold
mWhiteThreshold = DEFAULT_TEXT_WHITE_GAMMA_THRESHOLD;
if (property_get(PROPERTY_TEXT_WHITE_GAMMA_THRESHOLD, property, NULL) > 0) {
INIT_LOGD(" Setting text white gamma threshold to %s", property);
mWhiteThreshold = atoi(property);
} else {
INIT_LOGD(" Using default white black gamma threshold of %d",
DEFAULT_TEXT_WHITE_GAMMA_THRESHOLD);
}
// Compute the gamma tables
const float blackGamma = gamma;
const float whiteGamma = 1.0f / gamma;
for (uint32_t i = 0; i <= 255; i++) {
mGammaTable[i] = i;
const float v = i / 255.0f;
const float black = pow(v, blackGamma);
const float white = pow(v, whiteGamma);
mGammaTable[256 + i] = uint8_t((float)::floor(black * 255.0f + 0.5f));
mGammaTable[512 + i] = uint8_t((float)::floor(white * 255.0f + 0.5f));
}
memset(mRenderers, 0, sizeof(FontRenderer*) * kGammaCount);
memset(mRenderersUsageCount, 0, sizeof(uint32_t) * kGammaCount);
}
GammaFontRenderer::~GammaFontRenderer() {
for (int i = 0; i < kGammaCount; i++) {
delete mRenderers[i];
}
}
void GammaFontRenderer::clear() {
for (int i = 0; i < kGammaCount; i++) {
delete mRenderers[i];
mRenderers[i] = NULL;
}
}
void GammaFontRenderer::flush() {
int count = 0;
int min = -1;
uint32_t minCount = UINT_MAX;
for (int i = 0; i < kGammaCount; i++) {
if (mRenderers[i]) {
count++;
if (mRenderersUsageCount[i] < minCount) {
minCount = mRenderersUsageCount[i];
min = i;
}
}
}
if (count <= 1 || min < 0) return;
delete mRenderers[min];
mRenderers[min] = NULL;
}
FontRenderer* GammaFontRenderer::getRenderer(Gamma gamma) {
FontRenderer* renderer = mRenderers[gamma];
if (!renderer) {
renderer = new FontRenderer();
mRenderers[gamma] = renderer;
renderer->setGammaTable(&mGammaTable[gamma * 256]);
}
mRenderersUsageCount[gamma]++;
return renderer;
}
FontRenderer& GammaFontRenderer::getFontRenderer(const SkPaint* paint) {
if (paint->getShader() == NULL) {
uint32_t c = paint->getColor();
const int r = (c >> 16) & 0xFF;
const int g = (c >> 8) & 0xFF;
const int b = (c ) & 0xFF;
const int luminance = (r * 2 + g * 5 + b) >> 3;
if (luminance <= mBlackThreshold) {
return *getRenderer(kGammaBlack);
} else if (luminance >= mWhiteThreshold) {
return *getRenderer(kGammaWhite);
}
}
return *getRenderer(kGammaDefault);
}
}; // namespace uirenderer
}; // namespace android
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