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https://github.com/thorvg/thorvg.git
synced 2025-06-08 13:43:43 +00:00
4cdf648e14
Previously, translucent png images are not displayed properly due to alpha channels premultiplication. This patch implements that missing part to support it properly by introducing the Surface data between canvas engine & rasterizer @Issue: https://github.com/Samsung/thorvg/issues/655
128 lines
4.7 KiB
C++
128 lines
4.7 KiB
C++
/*
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* Copyright (c) 2020-2021 Samsung Electronics Co., Ltd. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "tvgMath.h"
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#include "tvgSwCommon.h"
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/************************************************************************/
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/* Internal Class Implementation */
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/************************************************************************/
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static inline bool _onlyShifted(const Matrix* m)
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{
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if (mathEqual(m->e11, 1.0f) && mathEqual(m->e22, 1.0f) && mathZero(m->e12) && mathZero(m->e21)) return true;
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return false;
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}
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static bool _genOutline(SwImage* image, const Matrix* transform, SwMpool* mpool, unsigned tid)
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{
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image->outline = mpoolReqOutline(mpool, tid);
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auto outline = image->outline;
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if (outline->reservedPtsCnt < 5) {
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outline->reservedPtsCnt = 5;
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outline->pts = static_cast<SwPoint*>(realloc(outline->pts, outline->reservedPtsCnt * sizeof(SwPoint)));
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outline->types = static_cast<uint8_t*>(realloc(outline->types, outline->reservedPtsCnt * sizeof(uint8_t)));
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}
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if (outline->reservedCntrsCnt < 1) {
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outline->reservedCntrsCnt = 1;
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outline->cntrs = static_cast<uint16_t*>(realloc(outline->cntrs, outline->reservedCntrsCnt * sizeof(uint16_t)));
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outline->closed = static_cast<bool*>(realloc(outline->closed, outline->reservedCntrsCnt * sizeof(bool)));
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outline->closed[0] = true;
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}
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auto w = static_cast<float>(image->w);
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auto h = static_cast<float>(image->h);
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Point to[4] = {{0 ,0}, {w, 0}, {w, h}, {0, h}};
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for (int i = 0; i < 4; i++) {
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outline->pts[outline->ptsCnt] = mathTransform(&to[i], transform);
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outline->types[outline->ptsCnt] = SW_CURVE_TYPE_POINT;
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++outline->ptsCnt;
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}
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outline->pts[outline->ptsCnt] = outline->pts[0];
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outline->types[outline->ptsCnt] = SW_CURVE_TYPE_POINT;
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++outline->ptsCnt;
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outline->cntrs[outline->cntrsCnt] = outline->ptsCnt - 1;
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++outline->cntrsCnt;
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image->outline = outline;
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return true;
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}
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/************************************************************************/
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/* External Class Implementation */
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/************************************************************************/
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bool imagePrepare(SwImage* image, const Matrix* transform, const SwBBox& clipRegion, SwBBox& renderRegion, SwMpool* mpool, unsigned tid)
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{
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image->direct = _onlyShifted(transform);
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//Fast track: Non-transformed image but just shifted.
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if (image->direct) {
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image->ox = -static_cast<uint32_t>(round(transform->e13));
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image->oy = -static_cast<uint32_t>(round(transform->e23));
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//Figure out the scale factor by transform matrix
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} else {
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auto scaleX = sqrtf((transform->e11 * transform->e11) + (transform->e21 * transform->e21));
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auto scaleY = sqrtf((transform->e22 * transform->e22) + (transform->e12 * transform->e12));
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image->scale = (fabsf(scaleX - scaleY) > 0.01f) ? 1.0f : scaleX;
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if (mathZero(transform->e12) && mathZero(transform->e21)) image->scaled = true;
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else image->scaled = false;
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}
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if (!_genOutline(image, transform, mpool, tid)) return false;
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return mathUpdateOutlineBBox(image->outline, clipRegion, renderRegion, image->direct);
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}
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bool imageGenRle(SwImage* image, const SwBBox& renderRegion, bool antiAlias)
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{
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if ((image->rle = rleRender(image->rle, image->outline, renderRegion, antiAlias))) return true;
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return false;
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}
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void imageDelOutline(SwImage* image, SwMpool* mpool, uint32_t tid)
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{
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mpoolRetOutline(mpool, tid);
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image->outline = nullptr;
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}
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void imageReset(SwImage* image)
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{
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rleReset(image->rle);
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}
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void imageFree(SwImage* image)
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{
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rleFree(image->rle);
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}
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