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64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
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/*
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* SDLImageScaler.h, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#pragma once
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#include "../render/IImage.h"
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#include "../../lib/Rect.h"
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class SDLImageOptimizer : boost::noncopyable
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{
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SDL_Surface * surf = nullptr;
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SDL_Surface * output = nullptr;
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Rect virtualDimensions = Rect(0,0,0,0);
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public:
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SDLImageOptimizer(SDL_Surface * surf, const Rect & virtualDimensions);
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void optimizeSurface(SDL_Surface * formatSourceSurface);
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/// Aquires resulting surface and transfers surface ownership to the caller
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/// May return nullptr if input image was empty
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SDL_Surface * acquireResultSurface();
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/// Returns adjusted virtual dimensions of resulting surface
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const Rect & getResultDimensions() const;
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};
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/// Class that performs scaling of SDL surfaces
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/// Object construction MUST be performed while holding UI lock
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/// but task execution can be performed asynchronously if needed
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class SDLImageScaler : boost::noncopyable
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{
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SDL_Surface * intermediate = nullptr;
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SDL_Surface * ret = nullptr;
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Rect virtualDimensionsInput = Rect(0,0,0,0);
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Rect virtualDimensionsOutput = Rect(0,0,0,0);
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public:
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SDLImageScaler(SDL_Surface * surf);
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SDLImageScaler(SDL_Surface * surf, const Rect & virtualDimensions);
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~SDLImageScaler();
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/// Performs upscaling or downscaling to a requested dimensions
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/// Aspect ratio is NOT maintained.
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/// xbrz algorithm is not supported in this mode
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void scaleSurface(Point dimensions, EScalingAlgorithm algorithm);
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/// Performs upscaling by specified integral factor, potentially using xbrz algorithm if requested
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void scaleSurfaceIntegerFactor(int factor, EScalingAlgorithm algorithm);
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/// Aquires resulting surface and transfers surface ownership to the caller
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/// May return nullptr if input image was empty
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SDL_Surface * acquireResultSurface();
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/// Returns adjusted virtual dimensions of resulting surface
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const Rect & getResultDimensions() const;
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};
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