Greatly simplified the shape example
Sam Lantinga
parent
b7c61569f8
commit
1143bdc351
447
test/testshape.c
447
test/testshape.c
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@ -9,408 +9,103 @@
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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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#include <SDL3/SDL_test.h>
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#define SHAPED_WINDOW_DIMENSION 640
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/** An enum denoting the specific type of contents present in an SDL_WindowShapeParams union. */
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typedef enum
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int main(int argc, char *argv[])
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{
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/** The default mode, a binarized alpha cutoff of 1. */
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ShapeModeDefault,
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/** A binarized alpha cutoff with a given integer value. */
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ShapeModeBinarizeAlpha,
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/** A binarized alpha cutoff with a given integer value, but with the opposite comparison. */
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ShapeModeReverseBinarizeAlpha,
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/** A color key is applied. */
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ShapeModeColorKey
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} WindowShapeMode;
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SDL_Window *window = NULL;
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SDL_Renderer *renderer = NULL;
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SDL_Surface *shape = NULL;
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SDL_Texture *shape_texture = NULL;
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SDL_Event event;
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SDL_bool done = SDL_FALSE;
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int return_code = 1;
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/** A union containing parameters for shaped windows. */
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typedef union
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{
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/** A cutoff alpha value for binarization of the window shape's alpha channel. */
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Uint8 binarizationCutoff;
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SDL_Color colorKey;
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} SDL_WindowShapeParams;
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/** A struct that tags the SDL_WindowShapeParams union with an enum describing the type of its contents. */
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typedef struct SDL_WindowShapeMode
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{
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/** The mode of these window-shape parameters. */
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WindowShapeMode mode;
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/** Window-shape parameters. */
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SDL_WindowShapeParams parameters;
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} SDL_WindowShapeMode;
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typedef struct LoadedPicture
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{
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SDL_Surface *surface;
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int num_textures;
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SDL_Texture **textures;
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SDL_Texture **shape_textures;
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SDL_WindowShapeMode mode;
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const char *name;
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struct LoadedPicture *next;
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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 void log_usage(SDLTest_CommonState *state, char *progname) {
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static const char *options[] = { "sample1.bmp [sample2.bmp [sample3.bmp ...]]", NULL };
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SDLTest_CommonLogUsage(state, progname, options);
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}
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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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Uint32 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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if (argc != 2) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Usage: %s shape.bmp\n", argv[0]);
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goto quit;
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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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if (SDL_ReadSurfacePixel(shape, x, y, &r, &g, &b, &alpha) != 0) {
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continue;
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}
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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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/* Create the window hidden so we can set the window size to match our shape */
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window = SDL_CreateWindow("Shape test", 1, 1, SDL_WINDOW_HIDDEN | SDL_WINDOW_TRANSPARENT);
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if (!window) {
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SDL_Log("Couldn't create transparent window: %s\n", SDL_GetError());
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goto quit;
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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(LoadedPicture *picture, 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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renderer = SDL_CreateRenderer(window, NULL, 0);
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if (!renderer) {
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SDL_Log("Couldn't create renderer: %s\n", SDL_GetError());
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goto quit;
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}
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if (!picture) {
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return SDL_SetError("picture");
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shape = SDL_LoadBMP(argv[1]);
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if (!shape) {
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SDL_Log("Couldn't load %s: %s\n", argv[1], SDL_GetError());
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goto quit;
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}
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if (picture->shape_textures[0]) {
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int i;
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for (i = 0; i < picture->num_textures; i++) {
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SDL_DestroyTexture(picture->shape_textures[i]);
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picture->shape_textures[i] = NULL;
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}
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if (!SDL_ISPIXELFORMAT_ALPHA(shape->format->format)) {
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/* Set the colorkey to the top-left pixel */
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Uint8 r, g, b, a;
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SDL_ReadSurfacePixel(shape, 0, 0, &r, &g, &b, &a);
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SDL_SetSurfaceColorKey(shape, 1, SDL_MapRGBA(shape->format, r, g, b, a));
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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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shape_texture = SDL_CreateTextureFromSurface(renderer, shape);
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if (!shape_texture) {
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SDL_Log("Couldn't create shape texture: %s\n", SDL_GetError());
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goto quit;
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}
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if (!shape_mode) {
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return SDL_SetError("shape_mode");
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/* Set the blend mode so the alpha channel of the shape is the window transparency */
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if (SDL_SetTextureBlendMode(shape_texture,
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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)) < 0) {
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SDL_Log("Couldn't set shape blend mode: %s\n", SDL_GetError());
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goto quit;
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}
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g_bitmap_w = picture->surface->w;
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g_bitmap_h = picture->surface->h;
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g_bitmap = (Uint8*) SDL_malloc(picture->surface->w * picture->surface->h);
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if (!g_bitmap) {
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return -1;
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}
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/* Set the window size to the size of our shape and show it */
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SDL_SetWindowSize(window, shape->w, shape->h);
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SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
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SDL_ShowWindow(window);
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SDL_CalculateShapeBitmap(*shape_mode, picture->surface, 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(int index, SDL_Renderer *renderer, LoadedPicture *picture)
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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, picture->textures[index], 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 (!picture->shape_textures[index]) {
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SDL_BlendMode bm;
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picture->shape_textures[index] = 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(picture->shape_textures[index], bm);
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}
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SDL_RenderTexture(renderer, picture->shape_textures[index], 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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int num_pictures = 0;
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LoadedPicture *pic_i = NULL;
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LoadedPicture *picture_linked_list = NULL;
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LoadedPicture **pictures = NULL;
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int i;
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int j;
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const SDL_DisplayMode *mode;
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SDL_PixelFormat *format = NULL;
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SDL_Color black = { 0, 0, 0, 0xff };
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int done = 0;
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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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SDLTest_CommonState *state;
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int rc;
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/* Initialize test framework */
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state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
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if (!state) {
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return 1;
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}
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state->window_flags |= SDL_WINDOW_TRANSPARENT;
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state->window_flags &= ~SDL_WINDOW_RESIZABLE;
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rc = 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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/* Parse commandline */
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for (i = 1; i < argc;) {
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int consumed;
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consumed = SDLTest_CommonArg(state, i);
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if (!consumed) {
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LoadedPicture *new_picture;
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new_picture = SDL_malloc(sizeof(LoadedPicture));
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new_picture->name = argv[i];
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new_picture->next = picture_linked_list;
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picture_linked_list = new_picture;
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num_pictures++;
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consumed = 1;
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}
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if (consumed <= 0) {
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log_usage(state, argv[0]);
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exit(-1);
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}
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i += consumed;
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}
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if (!num_pictures) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "testshape requires at least one bitmap file as argument.");
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log_usage(state, argv[0]);
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rc = -1;
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goto ret;
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}
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if (!SDLTest_CommonInit(state)) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not initialize SDL video.");
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rc = -2;
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goto ret;
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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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rc = -2;
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goto ret;
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}
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/* Allocate an array of LoadedPicture pointers for convenience accesses. */
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pictures = (LoadedPicture **)SDL_malloc(sizeof(LoadedPicture*) * num_pictures);
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if (!pictures) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not allocate memory.");
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rc = 1;
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goto ret;
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}
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for (i = 0, pic_i = picture_linked_list; i < num_pictures; i++, pic_i = pic_i->next) {
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pictures[i] = pic_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(pictures[i]->name);
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if (pictures[i]->surface == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not load surface from named bitmap file: %s", pictures[i]->name);
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rc = -3;
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goto ret;
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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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for (i = 0; i < num_pictures; i++) {
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pictures[i]->textures = SDL_calloc(state->num_windows, sizeof(SDL_Texture *));
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pictures[i]->shape_textures = SDL_calloc(state->num_windows, sizeof(SDL_Texture *));
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if (!pictures[i]->textures || !pictures[i]->shape_textures) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create textures array(s).");
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rc = -4;
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goto ret;
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}
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for (j = 0; j < state->num_windows; j++) {
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pictures[i]->textures[j] = SDL_CreateTextureFromSurface(state->renderers[j], pictures[i]->surface);
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if (!pictures[i]->textures[j]) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create textures for SDL_shape.");
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rc = -5;
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goto ret;
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}
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}
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}
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done = 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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for (i = 0; i < state->num_windows; i++) {
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SDL_QueryTexture(pictures[current_picture]->textures[i], &pixelFormat, &access, &w, &h);
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/* We want to set the window size in pixels */
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SDL_SetWindowSize(state->windows[i], (int)SDL_ceilf(w / mode->pixel_density), (int)SDL_ceilf(h / mode->pixel_density));
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}
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SDL3_SetWindowShape(pictures[current_picture], &pictures[current_picture]->mode);
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/* We're ready to go! */
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while (!done) {
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SDL_Event event;
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while (SDL_PollEvent(&event)) {
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SDLTest_CommonEvent(state, &event, &done);
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if (event.type == SDL_EVENT_KEY_DOWN) {
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button_down = 1;
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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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for (i = 0; i < state->num_windows; i++) {
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SDL_QueryTexture(pictures[current_picture]->textures[i], &pixelFormat, &access, &w, &h);
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SDL_SetWindowSize(state->windows[i], (int)SDL_ceilf(w / mode->pixel_density),(int)SDL_ceilf(h / mode->pixel_density));
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SDL3_SetWindowShape(pictures[current_picture], &pictures[current_picture]->mode);
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}
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switch (event.type) {
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case SDL_EVENT_KEY_DOWN:
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case SDL_EVENT_QUIT:
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/* Quit on keypress and quit event */
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done = SDL_TRUE;
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break;
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default:
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break;
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}
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}
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for (i = 0; i < state->num_windows; i++) {
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render(i, state->renderers[i], pictures[current_picture]);
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}
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SDL_Delay(10);
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/* We'll clear to white, but you could do other drawing here */
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SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
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SDL_RenderClear(renderer);
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/* Apply the shape */
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SDL_RenderTexture(renderer, shape_texture, NULL, NULL);
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/* Show everything on the screen and wait a bit */
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SDL_RenderPresent(renderer);
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SDL_Delay(100);
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}
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||||
ret:
|
||||
/* Free the textures + original surfaces backing the textures. */
|
||||
for (pic_i = picture_linked_list; pic_i; ) {
|
||||
LoadedPicture *next = pic_i->next;
|
||||
for (j = 0; j < state->num_windows; j++) {
|
||||
SDL_DestroyTexture(pic_i->textures[i]);
|
||||
}
|
||||
SDL_free(pic_i->textures);
|
||||
SDL_DestroySurface(pic_i->surface);
|
||||
SDL_free(pic_i);
|
||||
pic_i = next;
|
||||
}
|
||||
SDL_free(pictures);
|
||||
/* Success! */
|
||||
return_code = 0;
|
||||
|
||||
if (g_bitmap) {
|
||||
SDL_free(g_bitmap);
|
||||
g_bitmap = NULL;
|
||||
}
|
||||
if (g_shape_surface) {
|
||||
SDL_DestroySurface(g_shape_surface);
|
||||
g_shape_surface = NULL;
|
||||
}
|
||||
|
||||
SDLTest_CommonQuit(state);
|
||||
|
||||
return rc;
|
||||
quit:
|
||||
SDL_DestroySurface(shape);
|
||||
SDL_Quit();
|
||||
return return_code;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue