369 lines
12 KiB
C
369 lines
12 KiB
C
/*
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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#include <stdlib.h>
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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#define SHAPED_WINDOW_DIMENSION 640
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typedef struct LoadedPicture
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{
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SDL_Surface *surface;
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SDL_Texture *texture;
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SDL_WindowShapeMode mode;
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const char *name;
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} LoadedPicture;
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static Uint8 *g_bitmap = NULL;
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static int g_bitmap_w = 0, g_bitmap_h = 0;
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static SDL_Surface *g_shape_surface = NULL;
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static SDL_Texture *g_shape_texture = NULL;
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/* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte. */
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static void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint8 *bitmap, Uint8 ppb)
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{
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int x = 0;
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int y = 0;
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Uint8 r = 0, g = 0, b = 0, alpha = 0;
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Uint8 *pixel = NULL;
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Uint32 pixel_value = 0, mask_value = 0;
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size_t bytes_per_scanline = (size_t)(shape->w + (ppb - 1)) / ppb;
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Uint8 *bitmap_scanline;
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SDL_Color key;
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if (SDL_MUSTLOCK(shape)) {
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SDL_LockSurface(shape);
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}
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SDL_memset(bitmap, 0, shape->h * bytes_per_scanline);
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for (y = 0; y < shape->h; y++) {
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bitmap_scanline = bitmap + y * bytes_per_scanline;
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for (x = 0; x < shape->w; x++) {
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alpha = 0;
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pixel_value = 0;
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pixel = (Uint8 *)(shape->pixels) + (y * shape->pitch) + (x * shape->format->BytesPerPixel);
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switch (shape->format->BytesPerPixel) {
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case (1):
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pixel_value = *pixel;
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break;
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case (2):
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pixel_value = *(Uint16 *)pixel;
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break;
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case (3):
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pixel_value = *(Uint32 *)pixel & (~shape->format->Amask);
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break;
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case (4):
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pixel_value = *(Uint32 *)pixel;
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break;
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}
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SDL_GetRGBA(pixel_value, shape->format, &r, &g, &b, &alpha);
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switch (mode.mode) {
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case (ShapeModeDefault):
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mask_value = (alpha >= 1 ? 1 : 0);
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break;
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case (ShapeModeBinarizeAlpha):
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mask_value = (alpha >= mode.parameters.binarizationCutoff ? 1 : 0);
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break;
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case (ShapeModeReverseBinarizeAlpha):
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mask_value = (alpha <= mode.parameters.binarizationCutoff ? 1 : 0);
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break;
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case (ShapeModeColorKey):
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key = mode.parameters.colorKey;
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mask_value = ((key.r != r || key.g != g || key.b != b) ? 1 : 0);
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break;
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}
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bitmap_scanline[x / ppb] |= mask_value << (x % ppb);
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}
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}
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if (SDL_MUSTLOCK(shape)) {
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SDL_UnlockSurface(shape);
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}
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}
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static int SDL3_SetWindowShape(SDL_Window *window, SDL_Surface *shape, SDL_WindowShapeMode *shape_mode)
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{
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if (g_bitmap) {
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SDL_free(g_bitmap);
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g_bitmap = NULL;
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}
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if (g_shape_texture) {
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SDL_DestroyTexture(g_shape_texture);
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g_shape_texture = NULL;
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}
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if (g_shape_surface) {
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SDL_DestroySurface(g_shape_surface);
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g_shape_surface = NULL;
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}
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if (shape == NULL) {
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return SDL_SetError("shape");
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}
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if (shape_mode == NULL) {
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return SDL_SetError("shape_mode");
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}
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g_bitmap_w = shape->w;
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g_bitmap_h = shape->h;
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g_bitmap = (Uint8*) SDL_malloc(shape->w * shape->h);
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if (g_bitmap == NULL) {
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return SDL_OutOfMemory();
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}
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SDL_CalculateShapeBitmap(*shape_mode, shape, g_bitmap, 1);
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g_shape_surface = SDL_CreateSurface(g_bitmap_w, g_bitmap_h, SDL_PIXELFORMAT_ABGR8888);
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if (g_shape_surface) {
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int x, y, i = 0;
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Uint32 *ptr = g_shape_surface->pixels;
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for (y = 0; y < g_bitmap_h; y++) {
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for (x = 0; x < g_bitmap_w; x++) {
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Uint8 val = g_bitmap[i++];
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if (val == 0) {
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ptr[x] = 0;
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} else {
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ptr[x] = 0xffffffff;
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}
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}
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ptr = (Uint32 *)((Uint8 *)ptr + g_shape_surface->pitch);
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}
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}
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return 0;
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}
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static void render(SDL_Renderer *renderer, SDL_Texture *texture)
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{
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/* Clear render-target to blue. */
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SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0xff, 0xff);
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SDL_RenderClear(renderer);
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/* Render the texture. */
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SDL_RenderTexture(renderer, texture, NULL, NULL);
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/* Apply the shape */
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if (g_shape_surface) {
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SDL_RendererInfo info;
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SDL_GetRendererInfo(renderer, &info);
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if (info.flags & SDL_RENDERER_SOFTWARE) {
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if (g_bitmap) {
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int x, y, i = 0;
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Uint8 r, g, b, a;
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SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
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for (y = 0; y < g_bitmap_h; y++) {
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for (x = 0; x < g_bitmap_w; x++) {
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Uint8 val = g_bitmap[i++];
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if (val == 0) {
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SDL_RenderPoint(renderer, (float)x, (float)y);
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}
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}
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}
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SDL_SetRenderDrawColor(renderer, r, g, b, a);
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}
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} else {
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if (g_shape_texture == NULL) {
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SDL_BlendMode bm;
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g_shape_texture = SDL_CreateTextureFromSurface(renderer, g_shape_surface);
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/* if Alpha is 0, set all to 0, else leave unchanged. */
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bm = SDL_ComposeCustomBlendMode(
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SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD,
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SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD);
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SDL_SetTextureBlendMode(g_shape_texture, bm);
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}
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SDL_RenderTexture(renderer, g_shape_texture, NULL, NULL);
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}
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}
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SDL_RenderPresent(renderer);
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}
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int main(int argc, char **argv)
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{
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Uint8 num_pictures;
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LoadedPicture *pictures;
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int i, j;
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const SDL_DisplayMode *mode;
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SDL_PixelFormat *format = NULL;
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SDL_Window *window;
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SDL_Renderer *renderer;
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SDL_Color black = { 0, 0, 0, 0xff };
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SDL_Event event;
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int should_exit = 0;
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unsigned int current_picture;
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int button_down;
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Uint32 pixelFormat = 0;
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int w, h, access = 0;
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// SDL_SetHint(SDL_HINT_RENDER_DRIVER, "software");
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// SDL_SetHint(SDL_HINT_VIDEO_FORCE_EGL, "0");
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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if (argc < 2) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_Shape requires at least one bitmap file as argument.");
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exit(-1);
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}
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if (SDL_Init(SDL_INIT_VIDEO) == -1) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not initialize SDL video.");
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exit(-2);
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}
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mode = SDL_GetDesktopDisplayMode(SDL_GetPrimaryDisplay());
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if (!mode) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't get desktop display mode: %s", SDL_GetError());
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exit(-2);
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}
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num_pictures = argc - 1;
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pictures = (LoadedPicture *)SDL_malloc(sizeof(LoadedPicture) * num_pictures);
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if (pictures == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not allocate memory.");
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exit(1);
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}
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for (i = 0; i < num_pictures; i++) {
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pictures[i].surface = NULL;
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}
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for (i = 0; i < num_pictures; i++) {
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pictures[i].surface = SDL_LoadBMP(argv[i + 1]);
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pictures[i].name = argv[i + 1];
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if (pictures[i].surface == NULL) {
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for (j = 0; j < num_pictures; j++) {
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SDL_DestroySurface(pictures[j].surface);
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}
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SDL_free(pictures);
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SDL_Quit();
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not load surface from named bitmap file: %s", argv[i + 1]);
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exit(-3);
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}
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format = pictures[i].surface->format;
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if (SDL_ISPIXELFORMAT_ALPHA(format->format)) {
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pictures[i].mode.mode = ShapeModeBinarizeAlpha;
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pictures[i].mode.parameters.binarizationCutoff = 255;
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} else {
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pictures[i].mode.mode = ShapeModeColorKey;
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pictures[i].mode.parameters.colorKey = black;
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}
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}
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window = SDL_CreateWindow("SDL_Shape test", SHAPED_WINDOW_DIMENSION, SHAPED_WINDOW_DIMENSION, SDL_WINDOW_TRANSPARENT);
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if (window == NULL) {
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for (i = 0; i < num_pictures; i++) {
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SDL_DestroySurface(pictures[i].surface);
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}
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SDL_free(pictures);
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SDL_Quit();
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create shaped window for SDL_Shape.");
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exit(-4);
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}
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renderer = SDL_CreateRenderer(window, NULL, 0);
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if (renderer == NULL) {
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SDL_DestroyWindow(window);
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for (i = 0; i < num_pictures; i++) {
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SDL_DestroySurface(pictures[i].surface);
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}
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SDL_free(pictures);
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SDL_Quit();
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create rendering context for SDL_Shape window.");
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exit(-5);
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}
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for (i = 0; i < num_pictures; i++) {
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pictures[i].texture = NULL;
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}
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for (i = 0; i < num_pictures; i++) {
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pictures[i].texture = SDL_CreateTextureFromSurface(renderer, pictures[i].surface);
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if (pictures[i].texture == NULL) {
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for (i = 0; i < num_pictures; i++) {
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if (pictures[i].texture != NULL) {
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SDL_DestroyTexture(pictures[i].texture);
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}
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}
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for (i = 0; i < num_pictures; i++) {
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SDL_DestroySurface(pictures[i].surface);
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}
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SDL_free(pictures);
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create texture for SDL_shape.");
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exit(-6);
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}
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}
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should_exit = 0;
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current_picture = 0;
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button_down = 0;
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SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Changing to shaped bmp: %s", pictures[current_picture].name);
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SDL_QueryTexture(pictures[current_picture].texture, &pixelFormat, &access, &w, &h);
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/* We want to set the window size in pixels */
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SDL_SetWindowSize(window, (int)SDL_ceilf(w / mode->display_scale), (int)SDL_ceilf(h / mode->display_scale));
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SDL3_SetWindowShape(window, pictures[current_picture].surface, &pictures[current_picture].mode);
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while (should_exit == 0) {
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while (SDL_PollEvent(&event)) {
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if (event.type == SDL_EVENT_KEY_DOWN) {
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button_down = 1;
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if (event.key.keysym.sym == SDLK_ESCAPE) {
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should_exit = 1;
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break;
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}
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}
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if (button_down && event.type == SDL_EVENT_KEY_UP) {
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button_down = 0;
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current_picture += 1;
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if (current_picture >= num_pictures) {
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current_picture = 0;
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}
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SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Changing to shaped bmp: %s", pictures[current_picture].name);
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SDL_QueryTexture(pictures[current_picture].texture, &pixelFormat, &access, &w, &h);
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SDL_SetWindowSize(window, (int)SDL_ceilf(w / mode->display_scale), (int)SDL_ceilf(h / mode->display_scale));
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SDL3_SetWindowShape(window, pictures[current_picture].surface, &pictures[current_picture].mode);
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}
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if (event.type == SDL_EVENT_QUIT) {
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should_exit = 1;
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break;
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}
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}
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render(renderer, pictures[current_picture].texture);
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SDL_Delay(10);
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}
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/* Free the textures. */
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for (i = 0; i < num_pictures; i++) {
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SDL_DestroyTexture(pictures[i].texture);
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}
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SDL_DestroyRenderer(renderer);
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/* Destroy the window. */
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SDL_DestroyWindow(window);
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/* Free the original surfaces backing the textures. */
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for (i = 0; i < num_pictures; i++) {
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SDL_DestroySurface(pictures[i].surface);
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}
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SDL_free(pictures);
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/* Call SDL_Quit() before quitting. */
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SDL_Quit();
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return 0;
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}
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