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sdl: Remove usage of SDL_SoftStretch

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SDL 2 lets us take advantage of a fixed logical resolution,
where the renderer scales content up or down automatically.

Relative mouse motion is also affected by renderer scaling
by default (see SDL_HINT_MOUSE_RELATIVE_SCALING).

If window zoom has been enabled from the command line,
set scaling quality to "nearest pixel sampling" instead
of "best" to allow pixel peeping.

Change-Id: I4e5c19d36b55c985c26ac5ae64c4a6b8dd9b308d
This commit is contained in:
Christian Soffke 2024-12-22 12:47:21 +01:00
parent 60f3283f48
commit 759cbf4e5f
5 changed files with 21 additions and 43 deletions
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34
firmware/target/hosted/sdl/lcd-sdl.c
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@ -26,7 +26,6 @@
#include "misc.h"
double display_zoom = 1;
static bool window_needs_update;
void sdl_get_window_dimensions(int *w, int *h)
@ -138,18 +137,8 @@ void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
src.w = width;
src.h = height;
if (display_zoom == 1) {
dest = src;
SDL_BlitSurface(lcd, &src, surface, &dest);
} else {
/* Note: SDL_SoftStretch is currently marked as DO NOT USE
but there are no real alternatives for efficent zooming. */
dest.x = src.x * display_zoom;
dest.y = src.y * display_zoom;
dest.w = src.w * display_zoom;
dest.h = src.h * display_zoom;
SDL_SoftStretch(lcd, &src, surface, &dest);
}
dest = src;
SDL_BlitSurface(lcd, &src, surface, &dest);
SDL_FreeSurface(lcd);
#else
int x, y;
@ -163,26 +152,26 @@ void sdl_update_rect(SDL_Surface *surface, int x_start, int y_start, int width,
if(ymax >= max_y)
ymax = max_y;
dest.w = display_zoom;
dest.h = display_zoom;
dest.w = 1;
dest.h = 1;
for (x = x_start; x < xmax; x++) {
dest.x = x * display_zoom;
dest.x = x;
#ifdef HAVE_LCD_SPLIT
for (y = y_start; y < MIN(ymax, LCD_SPLIT_POS); y++) {
dest.y = y * display_zoom;
dest.y = y;
SDL_FillRect(surface, &dest, (Uint32)(getpixel(x, y) | 0x80));
}
for (y = MAX(y_start, LCD_SPLIT_POS); y < ymax; y++) {
dest.y = (y + LCD_SPLIT_LINES) * display_zoom ;
dest.y = (y + LCD_SPLIT_LINES) ;
SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
}
#else
for (y = y_start; y < ymax; y++) {
dest.y = y * display_zoom;
dest.y = y;
SDL_FillRect(surface, &dest, (Uint32)getpixel(x, y));
}
@ -199,11 +188,8 @@ void sdl_gui_update(SDL_Surface *surface, int x_start, int y_start, int width,
if (y_start + height > max_y)
height = max_y - y_start;
SDL_Rect src = {x_start * display_zoom, y_start * display_zoom,
width * display_zoom, height * display_zoom};
SDL_Rect dest= {(ui_x + x_start) * display_zoom,
(ui_y + y_start) * display_zoom,
width * display_zoom, height * display_zoom};
SDL_Rect src = {x_start, y_start, width, height};
SDL_Rect dest= {ui_x + x_start, ui_y + y_start, width, height};
uint8_t alpha;
if (SDL_GetSurfaceAlphaMod(surface,&alpha) == 0 && alpha < 255)