mirror of
https://github.com/openharmony/graphic_utils.git
synced 2026-07-21 11:55:25 -04:00
zhangguyuan
63 lines
1.9 KiB
C++
Executable File
63 lines
1.9 KiB
C++
Executable File
/*
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "gfx_utils/color.h"
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namespace OHOS {
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uint32_t Color::ColorTo32(ColorType color)
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{
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#if COLOR_DEPTH == 16
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Color32 ret;
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ret.red = color.red << 3; /* (2^8 - 1)/(2^5 - 1) = 255/31 = 8 */
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ret.green = color.green << 2; /* (2^8 - 1)/(2^6 - 1) = 255/63 = 4 */
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ret.blue = color.blue << 3; /* (2^8 - 1)/(2^5 - 1) = 255/31 = 8 */
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ret.alpha = 0xFF;
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return ret.full;
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#elif COLOR_DEPTH == 32
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return color.full;
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#endif
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}
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uint32_t Color::ColorTo32(Color16 color, uint8_t alpha)
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{
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Color32 ret;
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/*
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* when 16-bitmap image is tansformed to 32-bitmap,
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* R should shift left 3 bits,
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* G should shift left 2 bits,
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* B should shift left 3 bits,
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*/
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ret.red = color.red << 3; /* (2^8 - 1)/(2^5 - 1) = 255/31 = 8 */
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ret.green = color.green << 2; /* (2^8 - 1)/(2^6 - 1) = 255/63 = 4 */
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ret.blue = color.blue << 3; /* (2^8 - 1)/(2^5 - 1) = 255/31 = 8 */
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ret.alpha = alpha;
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return ret.full;
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}
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uint16_t Color::ColorTo16(Color32 color)
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{
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/*
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* when 32-bitmap image is tansformed to 16-bitmap,
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* R should shift right 3 bits,
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* G should shift right 2 bits,
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* B should shift right 3 bits,
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*/
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Color16 rColor;
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rColor.red = color.red >> 3;
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rColor.green = color.green >> 2;
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rColor.blue = color.blue >> 3;
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return rColor.full;
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}
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} // namespace OHOS
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