GammaFontRenderer.cpp revision c08820f587ad94698691a6657e87712de07e484c 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "Debug.h"
18#include "GammaFontRenderer.h"
19#include "Properties.h"
20
21namespace android {
22namespace uirenderer {
23
24GammaFontRenderer::GammaFontRenderer() {
25    INIT_LOGD("Creating lookup gamma font renderer");
26
27    // Compute the gamma tables
28    const float gamma = 1.0f / Properties::textGamma;
29
30    for (uint32_t i = 0; i <= 255; i++) {
31        mGammaTable[i] = uint8_t((float)::floor(pow(i / 255.0f, gamma) * 255.0f + 0.5f));
32    }
33}
34
35void GammaFontRenderer::endPrecaching() {
36    if (mRenderer) {
37        mRenderer->endPrecaching();
38    }
39}
40
41}; // namespace uirenderer
42}; // namespace android
43