SDLSurfacePtr.hh

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#ifndef SDLSURFACEPTR_HH
#define SDLSURFACEPTR_HH
 
#include "MemBuffer.hh"
#include "InitException.hh"
#include "narrow.hh"
#include <SDL.h>
#include <algorithm>
#include <memory>
#include <new>
#include <cassert>
#include <cstdlib>
 
class SDLSurfacePtr
{
public:
        SDLSurfacePtr(unsigned width, unsigned height, unsigned depth,
                      Uint32 rMask, Uint32 gMask, Uint32 bMask, Uint32 aMask)
        {
                assert((depth % 8) == 0);
                unsigned pitch = width * (depth >> 3);
                unsigned size = height * pitch;
                buffer.resize(size);
                surface = SDL_CreateRGBSurfaceFrom(
                        buffer.data(),
                        narrow<int>(width), narrow<int>(height),
                        narrow<int>(depth), narrow<int>(pitch),
                        rMask, gMask, bMask, aMask);
                if (!surface) throw std::bad_alloc();
        }
 
        explicit SDLSurfacePtr(SDL_Surface* surface_ = nullptr)
                : surface(surface_)
        {
        }
 
        SDLSurfacePtr(SDLSurfacePtr&& other) noexcept
                : surface(other.surface)
                , buffer(std::move(other.buffer))
        {
                other.surface = nullptr;
        }
 
        SDLSurfacePtr(const SDLSurfacePtr&) = delete;
        SDLSurfacePtr& operator=(const SDLSurfacePtr&) = delete;
 
        ~SDLSurfacePtr()
        {
                if (surface) SDL_FreeSurface(surface);
        }
 
        void reset(SDL_Surface* surface_ = nullptr)
        {
                SDLSurfacePtr temp(surface_);
                temp.swap(*this);
        }
 
        [[nodiscard]] SDL_Surface* get()
        {
                return surface;
        }
        [[nodiscard]] const SDL_Surface* get() const
        {
                return surface;
        }
 
        void swap(SDLSurfacePtr& other) noexcept
        {
                std::swap(surface, other.surface);
                std::swap(buffer,  other.buffer );
        }
 
        SDLSurfacePtr& operator=(SDLSurfacePtr&& other) noexcept
        {
                std::swap(surface, other.surface);
                std::swap(buffer,  other.buffer);
                return *this;
        }
 
        [[nodiscard]] SDL_Surface& operator*()
        {
                return *surface;
        }
        [[nodiscard]] const SDL_Surface& operator*() const
        {
                return *surface;
        }
 
        [[nodiscard]] SDL_Surface* operator->()
        {
                return surface;
        }
        [[nodiscard]] const SDL_Surface* operator->() const
        {
                return surface;
        }
 
        [[nodiscard]] explicit operator bool() const
        {
                return get() != nullptr;
        }
 
        [[nodiscard]] void* getLinePtr(unsigned y)
        {
                assert(y < unsigned(surface->h));
                return static_cast<Uint8*>(surface->pixels) + y * surface->pitch;
        }
        [[nodiscard]] const void* getLinePtr(unsigned y) const
        {
                return const_cast<SDLSurfacePtr*>(this)->getLinePtr(y);
        }
 
private:
        SDL_Surface* surface;
        openmsx::MemBuffer<char> buffer;
};
 
 
struct SDLDestroyTexture {
        void operator()(SDL_Texture* t) const { SDL_DestroyTexture(t); }
};
using SDLTexturePtr = std::unique_ptr<SDL_Texture, SDLDestroyTexture>;
 
 
struct SDLDestroyRenderer {
        void operator()(SDL_Renderer* r) const { SDL_DestroyRenderer(r); }
};
using SDLRendererPtr = std::unique_ptr<SDL_Renderer, SDLDestroyRenderer>;
 
 
struct SDLDestroyWindow {
        void operator()(SDL_Window* w) const { SDL_DestroyWindow(w); }
};
using SDLWindowPtr = std::unique_ptr<SDL_Window, SDLDestroyWindow>;
 
 
struct SDLFreeFormat {
        void operator()(SDL_PixelFormat* p) const { SDL_FreeFormat(p); }
};
using SDLAllocFormatPtr = std::unique_ptr<SDL_PixelFormat, SDLFreeFormat>;
 
 
struct SDLFreeWav {
        void operator()(Uint8* w) const { SDL_FreeWAV(w); }
};
using SDLWavPtr = std::unique_ptr<Uint8, SDLFreeWav>;
 
 
template<Uint32 FLAGS>
class SDLSubSystemInitializer
{
public:
        SDLSubSystemInitializer(const SDLSubSystemInitializer&) = delete;
        SDLSubSystemInitializer(SDLSubSystemInitializer&&) = delete;
        SDLSubSystemInitializer& operator=(const SDLSubSystemInitializer&) = delete;
        SDLSubSystemInitializer& operator=(SDLSubSystemInitializer&&) = delete;
 
        SDLSubSystemInitializer() {
                // SDL internally ref-counts sub-system initialization, so we
                // don't need to worry about it here.
                if (SDL_InitSubSystem(FLAGS) < 0) {
                        throw openmsx::InitException(
                                "SDL init failed (", FLAGS, "): ", SDL_GetError());
                }
        }
        ~SDLSubSystemInitializer() {
                SDL_QuitSubSystem(FLAGS);
        }
};
 
#endif