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The viewport function defines the rectangular area of the canvas that will be used for drawing operations. It is used to clip the rendering output to the boundaries of the rectangle. Apps can use this function to set the drawing region within the canvas. When the ThorVG canvas is partially inside the screen area such as during scrolling it could help enhance rendering performance. New Experimental API: - Result Canvas::viewport(int32_t x, int32_t y, int32_t w, int32_t h) noexcept; Issue: https://github.com/thorvg/thorvg/issues/2274
112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020 - 2024 the ThorVG project. 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 "tvgCanvas.h"
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#include "tvgLoadModule.h"
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#ifdef THORVG_SW_RASTER_SUPPORT
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#include "tvgSwRenderer.h"
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#else
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class SwRenderer : public RenderMethod
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{
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//Non Supported. Dummy Class */
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};
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#endif
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/************************************************************************/
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/* Internal Class Implementation */
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/************************************************************************/
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struct SwCanvas::Impl
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{
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};
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/************************************************************************/
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/* External Class Implementation */
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/************************************************************************/
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#ifdef THORVG_SW_RASTER_SUPPORT
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SwCanvas::SwCanvas() : Canvas(SwRenderer::gen()), pImpl(new Impl)
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#else
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SwCanvas::SwCanvas() : Canvas(nullptr), pImpl(new Impl)
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#endif
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{
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}
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SwCanvas::~SwCanvas()
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{
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delete(pImpl);
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}
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Result SwCanvas::mempool(MempoolPolicy policy) noexcept
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{
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#ifdef THORVG_SW_RASTER_SUPPORT
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//We know renderer type, avoid dynamic_cast for performance.
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auto renderer = static_cast<SwRenderer*>(Canvas::pImpl->renderer);
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if (!renderer) return Result::MemoryCorruption;
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//It can't change the policy during the running.
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if (!Canvas::pImpl->paints.empty()) return Result::InsufficientCondition;
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if (policy == MempoolPolicy::Individual) renderer->mempool(false);
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else renderer->mempool(true);
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return Result::Success;
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#endif
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return Result::NonSupport;
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}
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Result SwCanvas::target(uint32_t* buffer, uint32_t stride, uint32_t w, uint32_t h, Colorspace cs) noexcept
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{
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#ifdef THORVG_SW_RASTER_SUPPORT
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//We know renderer type, avoid dynamic_cast for performance.
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auto renderer = static_cast<SwRenderer*>(Canvas::pImpl->renderer);
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if (!renderer) return Result::MemoryCorruption;
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if (!renderer->target(buffer, stride, w, h, static_cast<ColorSpace>(cs))) return Result::InvalidArguments;
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Canvas::pImpl->vport.intersect({0, 0, (int32_t)w, (int32_t)h});
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renderer->viewport(Canvas::pImpl->vport);
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//Paints must be updated again with this new target.
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Canvas::pImpl->needRefresh();
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//FIXME: The value must be associated with an individual canvas instance.
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ImageLoader::cs = static_cast<ColorSpace>(cs);
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return Result::Success;
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#endif
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return Result::NonSupport;
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}
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unique_ptr<SwCanvas> SwCanvas::gen() noexcept
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{
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#ifdef THORVG_SW_RASTER_SUPPORT
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if (SwRenderer::init() <= 0) return nullptr;
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return unique_ptr<SwCanvas>(new SwCanvas);
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#endif
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return nullptr;
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}
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