SDLVisibleSurface.cc

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#include "SDLVisibleSurface.hh"
#include "SDLOffScreenSurface.hh"
#include "PNG.hh"
#include "SDLSnow.hh"
#include "OSDConsoleRenderer.hh"
#include "OSDGUILayer.hh"
#include "MSXException.hh"
#include "unreachable.hh"
#include "vla.hh"
#include "build-info.hh"
#include <cstdint>
#include <memory>

namespace openmsx {

SDLVisibleSurface::SDLVisibleSurface(
                unsigned width, unsigned height,
                Display& display_,
                RTScheduler& rtScheduler_,
                EventDistributor& eventDistributor_,
                InputEventGenerator& inputEventGenerator_,
                CliComm& cliComm_)
        : VisibleSurface(display_, rtScheduler_, eventDistributor_,
                         inputEventGenerator_, cliComm_)
{
        int flags = 0;
        createSurface(width, height, flags);
        const SDL_Surface* surf = getSDLSurface();
        setSDLFormat(*surf->format);
        setBufferPtr(static_cast<char*>(surf->pixels), surf->pitch);

        // In the SDL renderer logical size is the same as physical size.
        calculateViewPort(getLogicalSize());
}

void SDLVisibleSurface::flushFrameBuffer()
{
        unlock();
        SDL_Surface* surf = getSDLSurface();
        SDL_Renderer* render = getSDLRenderer();
        SDL_UpdateTexture(texture.get(), nullptr, surf->pixels, surf->pitch);
        SDL_RenderClear(render);
        SDL_RenderCopy(render, texture.get(), nullptr, nullptr);
}

void SDLVisibleSurface::finish()
{
        SDL_RenderPresent(getSDLRenderer());
}

std::unique_ptr<Layer> SDLVisibleSurface::createSnowLayer()
{
        switch (getSDLFormat().BytesPerPixel) {
#if HAVE_16BPP
        case 2:
                return std::make_unique<SDLSnow<uint16_t>>(*this, getDisplay());
#endif
#if HAVE_32BPP
        case 4:
                return std::make_unique<SDLSnow<uint32_t>>(*this, getDisplay());
#endif
        default:
                UNREACHABLE; return nullptr;
        }
}

std::unique_ptr<Layer> SDLVisibleSurface::createConsoleLayer(
                Reactor& reactor, CommandConsole& console)
{
        const bool openGL = false;
        return std::make_unique<OSDConsoleRenderer>(
                reactor, console, getWidth(), getHeight(), openGL);
}

std::unique_ptr<Layer> SDLVisibleSurface::createOSDGUILayer(OSDGUI& gui)
{
        return std::make_unique<SDLOSDGUILayer>(gui);
}

std::unique_ptr<OutputSurface> SDLVisibleSurface::createOffScreenSurface()
{
        return std::make_unique<SDLOffScreenSurface>(*getSDLSurface());
}

void SDLVisibleSurface::saveScreenshot(const std::string& filename)
{
        saveScreenshotSDL(*this, filename);
}

void SDLVisibleSurface::saveScreenshotSDL(
        OutputSurface& output, const std::string& filename)
{
        unsigned width = output.getWidth();
        unsigned height = output.getHeight();
        VLA(const void*, rowPointers, height);
        MemBuffer<uint8_t> buffer(width * height * 3);
        for (unsigned i = 0; i < height; ++i) {
                rowPointers[i] = &buffer[width * 3 * i];
        }
        if (SDL_RenderReadPixels(
                        output.getSDLRenderer(), nullptr,
                        SDL_PIXELFORMAT_RGB24, buffer.data(), width * 3)) {
                throw MSXException("Couldn't acquire screenshot pixels: ", SDL_GetError());
        }
        PNG::save(width, height, rowPointers, filename);
}

void SDLVisibleSurface::clearScreen()
{
        unlock();
        SDL_FillRect(getSDLSurface(), nullptr, 0);
}

} // namespace openmsx