thirdparty/scummvm
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BACKENDS: HiDPI support in OpenGL backend

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This commit is contained in:
Eugene Sandulenko 2020-10-29 19:12:24 +01:00
parent b29f457548
commit 5e395d166a
7 changed files with 83 additions and 12 deletions
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54
backends/graphics/sdl/sdl-graphics.h
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@ -163,7 +163,8 @@ protected:
void getWindowSizeFromSdl(int *width, int *height) const {
#if SDL_VERSION_ATLEAST(2, 0, 0)
assert(_window);
SDL_GetWindowSize(_window->getSDLWindow(), width, height);
SDL_GL_GetDrawableSize(_window->getSDLWindow(), width, height);
// SDL_GetWindowSize(_window->getSDLWindow(), width, height);
#else
assert(_hwScreen);
@ -176,6 +177,57 @@ protected:
}
#endif
}
/**
* Gets the display index that the ScummVM window is on
*/
void getWindowDisplayIndexFromSdl(int *index) const {
#if SDL_VERSION_ATLEAST(2, 0, 0)
assert(_window);
*index = SDL_GetWindowDisplayIndex(_window->getSDLWindow());
#else
*index = 0;
#endif
}
void getDisplayDpiFromSdl(float *dpi, float *defaultDpi) const {
const float systemDpi =
#ifdef __APPLE__
72.0f;
#elif defined(_WIN32)
96.0f;
#else
90.0f; // ScummVM default
#endif
if (defaultDpi)
*defaultDpi = systemDpi;
#if SDL_VERSION_ATLEAST(2, 0, 0)
int displayIndex = 0;
getWindowDisplayIndexFromSdl(&displayIndex);
if (SDL_GetDisplayDPI(displayIndex, NULL, dpi, NULL) != 0) {
if (dpi)
*dpi = systemDpi;
}
#else
*dpi = systemDpi;
#endif
}
/**
* Returns the scaling mode based on the display DPI
*/
void getDpiScalingFactor(uint *scale) const {
float dpi, defaultDpi, ratio;
getDisplayDpiFromSdl(&dpi, &defaultDpi);
debug(4, "dpi: %g default: %g", dpi, defaultDpi);
ratio = dpi / defaultDpi;
if (ratio >= 2.0f) {
*scale = 2;
} else {
*scale = 1;
}
}
virtual void setSystemMousePosition(const int x, const int y) override;