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