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Handle DPI scaling in SDL_GetWindowSurface

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Fixes DPI awareness of testdrawchessboard (previously, the surface was
being created in points instead of pixels, resulting in the demo app
only drawing in a corner of the screen on High-DPI displays)

*_CreateWindowFramebuffer()/*_UpdateWindowFramebuffer(): are updated
to use SDL_GetWindowSizeInPixels instead of SDL_GetWindowSize() or
window->w/window->h.

Most of the _CreateWindowFramebuffer backends are untested except
for Windows.

Fixes #7047
This commit is contained in:
Eric Wasylishen 2023-01-11 19:45:01 -07:00 • committed by Sam Lantinga
parent 6d11515873
commit 67c91353e0
11 changed files with 57 additions and 35 deletions
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11
src/video/riscos/SDL_riscosframebuffer.c
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@ -39,6 +39,9 @@ int RISCOS_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, vo
_kernel_swi_regs regs;
SDL_DisplayMode mode;
int size;
int w, h;
SDL_GetWindowSizeInPixels(window, &w, &h);
/* Free the old framebuffer surface */
RISCOS_DestroyWindowFramebuffer(_this, window);
@ -54,10 +57,10 @@ int RISCOS_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, vo
}
/* Calculate pitch */
*pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
*pitch = (((w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
/* Allocate the sprite area */
size = sizeof(sprite_area) + sizeof(sprite_header) + ((*pitch) * window->h);
size = sizeof(sprite_area) + sizeof(sprite_header) + ((*pitch) * h);
driverdata->fb_area = SDL_malloc(size);
if (!driverdata->fb_area) {
return SDL_OutOfMemory();
@ -73,8 +76,8 @@ int RISCOS_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, vo
regs.r[1] = (int)driverdata->fb_area;
regs.r[2] = (int)sprite_name;
regs.r[3] = 0;
regs.r[4] = window->w;
regs.r[5] = window->h;
regs.r[4] = w;
regs.r[5] = h;
regs.r[6] = sprite_mode;
error = _kernel_swi(OS_SpriteOp, &regs, &regs);
if (error != NULL) {