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107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018 Samsung Electronics Co., Ltd. All rights reserved.
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*
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* Licensed under the LGPL License, Version 2.1 (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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* https://www.gnu.org/licenses/
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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 "vdrawhelper.h"
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/*
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result = s
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dest = s * ca + d * cia
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*/
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void comp_func_solid_Source(uint32_t *dest, int length, uint32_t color,
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uint32_t const_alpha)
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{
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int ialpha, i;
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if (const_alpha == 255) {
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memfill32(dest, color, length);
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} else {
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ialpha = 255 - const_alpha;
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color = BYTE_MUL(color, const_alpha);
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for (i = 0; i < length; ++i)
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dest[i] = color + BYTE_MUL(dest[i], ialpha);
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}
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}
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/*
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r = s + d * sia
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dest = r * ca + d * cia
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= (s + d * sia) * ca + d * cia
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= s * ca + d * (sia * ca + cia)
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= s * ca + d * (1 - sa*ca)
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= s' + d ( 1 - s'a)
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*/
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void comp_func_solid_SourceOver(uint32_t *dest, int length, uint32_t color,
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uint32_t const_alpha)
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{
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int ialpha, i;
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if (const_alpha != 255) color = BYTE_MUL(color, const_alpha);
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ialpha = 255 - vAlpha(color);
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for (i = 0; i < length; ++i) dest[i] = color + BYTE_MUL(dest[i], ialpha);
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}
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void comp_func_Source(uint32_t *dest, const uint32_t *src, int length,
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uint32_t const_alpha)
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{
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if (const_alpha == 255) {
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memcpy(dest, src, size_t(length) * sizeof(uint));
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} else {
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uint ialpha = 255 - const_alpha;
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for (int i = 0; i < length; ++i) {
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dest[i] =
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INTERPOLATE_PIXEL_255(src[i], const_alpha, dest[i], ialpha);
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}
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}
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}
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/* s' = s * ca
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* d' = s' + d (1 - s'a)
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*/
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void comp_func_SourceOver(uint32_t *dest, const uint32_t *src, int length,
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uint32_t const_alpha)
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{
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uint s, sia;
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if (const_alpha == 255) {
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for (int i = 0; i < length; ++i) {
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s = src[i];
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if (s >= 0xff000000)
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dest[i] = s;
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else if (s != 0) {
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sia = vAlpha(~s);
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dest[i] = s + BYTE_MUL(dest[i], sia);
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}
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}
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} else {
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/* source' = source * const_alpha
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* dest = source' + dest ( 1- source'a)
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*/
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for (int i = 0; i < length; ++i) {
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uint s = BYTE_MUL(src[i], const_alpha);
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sia = vAlpha(~s);
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dest[i] = s + BYTE_MUL(dest[i], sia);
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}
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}
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}
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CompositionFunctionSolid COMP_functionForModeSolid_C[] = {
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comp_func_solid_Source, comp_func_solid_SourceOver};
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CompositionFunction COMP_functionForMode_C[] = {comp_func_Source,
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comp_func_SourceOver};
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void vInitBlendFunctions() {}
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