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feat: Add render mode options for image display in gsplash

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This commit is contained in:
Aditya Gupta
2026-05-24 11:00:21 +05:30
parent b5de077ac3
commit be9093655d
3 changed files with 106 additions and 13 deletions
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99
src/gsplash.c
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@@ -7,6 +7,7 @@
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <math.h>
static void log_info(const char *fmt, ...)
{
@@ -30,15 +31,53 @@ static void log_error(const char *fmt, ...)
fflush(stderr);
}
typedef enum RenderMode
{
RENDER_STRETCH = 0,
RENDER_CENTER,
RENDER_CROP
} RenderMode;
static RenderMode parse_render_mode(const char *value)
{
if (strcmp(value, "center") == 0)
{
return RENDER_CENTER;
}
if (strcmp(value, "crop") == 0)
{
return RENDER_CROP;
}
return RENDER_STRETCH;
}
int main(int argc, char *argv[])
{
if (argc < 3)
RenderMode render_mode = RENDER_CENTER;
int arg_index = 1;
if (argc >= 3 && strncmp(argv[1], "--mode=", 7) == 0)
{
log_error("Usage: %s <image_path> <game_executable> [args...]", argv[0]);
render_mode = parse_render_mode(argv[1] + 7);
arg_index += 1;
}
else if (argc >= 4 && strcmp(argv[1], "-m") == 0)
{
render_mode = parse_render_mode(argv[2]);
arg_index += 2;
}
if (argc - arg_index < 2)
{
log_error("Usage: %s [--mode=stretch|center|crop] <image_path> <game_executable> [args...]", argv[0]);
log_error(" %s -m stretch|center|crop <image_path> <game_executable> [args...]", argv[0]);
return 1;
}
log_info("Starting splash: image='%s', game='%s'", argv[1], argv[2]);
const char *image_path = argv[arg_index];
const char *game_path = argv[arg_index + 1];
log_info("Starting splash: image='%s', game='%s'", image_path, game_path);
// Initialize SDL2 Video subsystems
if (SDL_Init(SDL_INIT_VIDEO) < 0)
@@ -81,11 +120,11 @@ int main(int argc, char *argv[])
{
log_info("Renderer created (accelerated)");
}
SDL_Texture *texture = IMG_LoadTexture(renderer, argv[1]);
SDL_Texture *texture = IMG_LoadTexture(renderer, image_path);
if (!texture)
{
log_error("Failed to load splash image '%s': %s; showing black screen", argv[1], IMG_GetError());
log_error("Failed to load splash image '%s': %s; showing black screen", image_path, IMG_GetError());
// Fallback: Clear to solid black if image file is broken
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
@@ -95,8 +134,48 @@ int main(int argc, char *argv[])
{
log_info("Splash image loaded");
SDL_RenderClear(renderer);
// Automatically scales your image to perfectly match the monitor aspect ratio
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_Rect dst_rect = {0, 0, 0, 0};
int tex_w = 0;
int tex_h = 0;
int out_w = 0;
int out_h = 0;
if (SDL_QueryTexture(texture, NULL, NULL, &tex_w, &tex_h) == 0 &&
SDL_GetRendererOutputSize(renderer, &out_w, &out_h) == 0 &&
tex_w > 0 && tex_h > 0 && out_w > 0 && out_h > 0)
{
if (render_mode == RENDER_CENTER)
{
float scale = fminf((float)out_w / (float)tex_w, (float)out_h / (float)tex_h);
dst_rect.w = (int)(tex_w * scale);
dst_rect.h = (int)(tex_h * scale);
dst_rect.x = (out_w - dst_rect.w) / 2;
dst_rect.y = (out_h - dst_rect.h) / 2;
}
else if (render_mode == RENDER_CROP)
{
float scale = fmaxf((float)out_w / (float)tex_w, (float)out_h / (float)tex_h);
dst_rect.w = (int)(tex_w * scale);
dst_rect.h = (int)(tex_h * scale);
dst_rect.x = (out_w - dst_rect.w) / 2;
dst_rect.y = (out_h - dst_rect.h) / 2;
}
else
{
dst_rect.w = out_w;
dst_rect.h = out_h;
}
}
if (dst_rect.w > 0 && dst_rect.h > 0)
{
SDL_RenderCopy(renderer, texture, NULL, &dst_rect);
}
else
{
SDL_RenderCopy(renderer, texture, NULL, NULL);
}
SDL_RenderPresent(renderer);
}
@@ -106,9 +185,9 @@ int main(int argc, char *argv[])
if (pid == 0)
{
// Inside Child Process: Hand over execution directly to the game binary
log_info("Execing game: %s", argv[2]);
execvp(argv[2], &argv[2]);
log_error("Failed to launch target game executable '%s': %s", argv[2], strerror(errno));
log_info("Execing game: %s", game_path);
execvp(game_path, &argv[arg_index + 1]);
log_error("Failed to launch target game executable '%s': %s", game_path, strerror(errno));
_exit(1);
}
else if (pid < 0)