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Greatly simplified the shape example

main
Sam Lantinga 2024-02-09 01:46:09 -08:00
parent b7c61569f8
commit 1143bdc351
1 changed files with 71 additions and 376 deletions
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463
test/testshape.c
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@ -9,408 +9,103 @@
including commercial applications, and to alter it and redistribute it
freely.
*/
#include <stdlib.h>
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
#include <SDL3/SDL_test.h>
#define SHAPED_WINDOW_DIMENSION 640
/** An enum denoting the specific type of contents present in an SDL_WindowShapeParams union. */
typedef enum
int main(int argc, char *argv[])
{
/** The default mode, a binarized alpha cutoff of 1. */
ShapeModeDefault,
/** A binarized alpha cutoff with a given integer value. */
ShapeModeBinarizeAlpha,
/** A binarized alpha cutoff with a given integer value, but with the opposite comparison. */
ShapeModeReverseBinarizeAlpha,
/** A color key is applied. */
ShapeModeColorKey
} WindowShapeMode;
SDL_Window *window = NULL;
SDL_Renderer *renderer = NULL;
SDL_Surface *shape = NULL;
SDL_Texture *shape_texture = NULL;
SDL_Event event;
SDL_bool done = SDL_FALSE;
int return_code = 1;
/** A union containing parameters for shaped windows. */
typedef union
{
/** A cutoff alpha value for binarization of the window shape's alpha channel. */
Uint8 binarizationCutoff;
SDL_Color colorKey;
} SDL_WindowShapeParams;
/** A struct that tags the SDL_WindowShapeParams union with an enum describing the type of its contents. */
typedef struct SDL_WindowShapeMode
{
/** The mode of these window-shape parameters. */
WindowShapeMode mode;
/** Window-shape parameters. */
SDL_WindowShapeParams parameters;
} SDL_WindowShapeMode;
typedef struct LoadedPicture
{
SDL_Surface *surface;
int num_textures;
SDL_Texture **textures;
SDL_Texture **shape_textures;
SDL_WindowShapeMode mode;
const char *name;
struct LoadedPicture *next;
} LoadedPicture;
static Uint8 *g_bitmap = NULL;
static int g_bitmap_w = 0, g_bitmap_h = 0;
static SDL_Surface *g_shape_surface = NULL;
static void log_usage(SDLTest_CommonState *state, char *progname) {
static const char *options[] = { "sample1.bmp [sample2.bmp [sample3.bmp ...]]", NULL };
SDLTest_CommonLogUsage(state, progname, options);
}
/* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte. */
static void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint8 *bitmap, Uint8 ppb)
{
int x = 0;
int y = 0;
Uint8 r = 0, g = 0, b = 0, alpha = 0;
Uint32 mask_value = 0;
size_t bytes_per_scanline = (size_t)(shape->w + (ppb - 1)) / ppb;
Uint8 *bitmap_scanline;
SDL_Color key;
if (SDL_MUSTLOCK(shape)) {
SDL_LockSurface(shape);
if (argc != 2) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Usage: %s shape.bmp\n", argv[0]);
goto quit;
}
SDL_memset(bitmap, 0, shape->h * bytes_per_scanline);
for (y = 0; y < shape->h; y++) {
bitmap_scanline = bitmap + y * bytes_per_scanline;
for (x = 0; x < shape->w; x++) {
alpha = 0;
if (SDL_ReadSurfacePixel(shape, x, y, &r, &g, &b, &alpha) != 0) {
continue;
/* Create the window hidden so we can set the window size to match our shape */
window = SDL_CreateWindow("Shape test", 1, 1, SDL_WINDOW_HIDDEN | SDL_WINDOW_TRANSPARENT);
if (!window) {
SDL_Log("Couldn't create transparent window: %s\n", SDL_GetError());
goto quit;
}
switch (mode.mode) {
case (ShapeModeDefault):
mask_value = (alpha >= 1 ? 1 : 0);
renderer = SDL_CreateRenderer(window, NULL, 0);
if (!renderer) {
SDL_Log("Couldn't create renderer: %s\n", SDL_GetError());
goto quit;
}
shape = SDL_LoadBMP(argv[1]);
if (!shape) {
SDL_Log("Couldn't load %s: %s\n", argv[1], SDL_GetError());
goto quit;
}
if (!SDL_ISPIXELFORMAT_ALPHA(shape->format->format)) {
/* Set the colorkey to the top-left pixel */
Uint8 r, g, b, a;
SDL_ReadSurfacePixel(shape, 0, 0, &r, &g, &b, &a);
SDL_SetSurfaceColorKey(shape, 1, SDL_MapRGBA(shape->format, r, g, b, a));
}
shape_texture = SDL_CreateTextureFromSurface(renderer, shape);
if (!shape_texture) {
SDL_Log("Couldn't create shape texture: %s\n", SDL_GetError());
goto quit;
}
/* Set the blend mode so the alpha channel of the shape is the window transparency */
if (SDL_SetTextureBlendMode(shape_texture,
SDL_ComposeCustomBlendMode(
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD,
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD)) < 0) {
SDL_Log("Couldn't set shape blend mode: %s\n", SDL_GetError());
goto quit;
}
/* Set the window size to the size of our shape and show it */
SDL_SetWindowSize(window, shape->w, shape->h);
SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
SDL_ShowWindow(window);
/* We're ready to go! */
while (!done) {
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_KEY_DOWN:
case SDL_EVENT_QUIT:
/* Quit on keypress and quit event */
done = SDL_TRUE;
break;
case (ShapeModeBinarizeAlpha):
mask_value = (alpha >= mode.parameters.binarizationCutoff ? 1 : 0);
break;
case (ShapeModeReverseBinarizeAlpha):
mask_value = (alpha <= mode.parameters.binarizationCutoff ? 1 : 0);
break;
case (ShapeModeColorKey):
key = mode.parameters.colorKey;
mask_value = ((key.r != r || key.g != g || key.b != b) ? 1 : 0);
default:
break;
}
bitmap_scanline[x / ppb] |= mask_value << (x % ppb);
}
}
if (SDL_MUSTLOCK(shape)) {
SDL_UnlockSurface(shape);
}
}
static int SDL3_SetWindowShape(LoadedPicture *picture, SDL_WindowShapeMode *shape_mode)
{
if (g_bitmap) {
SDL_free(g_bitmap);
g_bitmap = NULL;
}
if (!picture) {
return SDL_SetError("picture");
}
if (picture->shape_textures[0]) {
int i;
for (i = 0; i < picture->num_textures; i++) {
SDL_DestroyTexture(picture->shape_textures[i]);
picture->shape_textures[i] = NULL;
}
}
if (g_shape_surface) {
SDL_DestroySurface(g_shape_surface);
g_shape_surface = NULL;
}
if (!shape_mode) {
return SDL_SetError("shape_mode");
}
g_bitmap_w = picture->surface->w;
g_bitmap_h = picture->surface->h;
g_bitmap = (Uint8*) SDL_malloc(picture->surface->w * picture->surface->h);
if (!g_bitmap) {
return -1;
}
SDL_CalculateShapeBitmap(*shape_mode, picture->surface, g_bitmap, 1);
g_shape_surface = SDL_CreateSurface(g_bitmap_w, g_bitmap_h, SDL_PIXELFORMAT_ABGR8888);
if (g_shape_surface) {
int x, y, i = 0;
Uint32 *ptr = g_shape_surface->pixels;
for (y = 0; y < g_bitmap_h; y++) {
for (x = 0; x < g_bitmap_w; x++) {
Uint8 val = g_bitmap[i++];
if (val == 0) {
ptr[x] = 0;
} else {
ptr[x] = 0xffffffff;
}
}
ptr = (Uint32 *)((Uint8 *)ptr + g_shape_surface->pitch);
}
}
return 0;
}
static void render(int index, SDL_Renderer *renderer, LoadedPicture *picture)
{
/* Clear render-target to blue. */
SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0xff, 0xff);
/* We'll clear to white, but you could do other drawing here */
SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
SDL_RenderClear(renderer);
/* Render the texture. */
SDL_RenderTexture(renderer, picture->textures[index], NULL, NULL);
/* Apply the shape */
if (g_shape_surface) {
SDL_RendererInfo info;
SDL_GetRendererInfo(renderer, &info);
if (info.flags & SDL_RENDERER_SOFTWARE) {
if (g_bitmap) {
int x, y, i = 0;
Uint8 r, g, b, a;
SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
for (y = 0; y < g_bitmap_h; y++) {
for (x = 0; x < g_bitmap_w; x++) {
Uint8 val = g_bitmap[i++];
if (val == 0) {
SDL_RenderPoint(renderer, (float)x, (float)y);
}
}
}
SDL_SetRenderDrawColor(renderer, r, g, b, a);
}
} else {
if (!picture->shape_textures[index]) {
SDL_BlendMode bm;
picture->shape_textures[index] = SDL_CreateTextureFromSurface(renderer, g_shape_surface);
/* if Alpha is 0, set all to 0, else leave unchanged. */
bm = SDL_ComposeCustomBlendMode(
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD,
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD);
SDL_SetTextureBlendMode(picture->shape_textures[index], bm);
}
SDL_RenderTexture(renderer, picture->shape_textures[index], NULL, NULL);
}
}
SDL_RenderTexture(renderer, shape_texture, NULL, NULL);
/* Show everything on the screen and wait a bit */
SDL_RenderPresent(renderer);
}
int main(int argc, char **argv)
{
int num_pictures = 0;
LoadedPicture *pic_i = NULL;
LoadedPicture *picture_linked_list = NULL;
LoadedPicture **pictures = NULL;
int i;
int j;
const SDL_DisplayMode *mode;
SDL_PixelFormat *format = NULL;
SDL_Color black = { 0, 0, 0, 0xff };
int done = 0;
int current_picture;
int button_down;
Uint32 pixelFormat = 0;
int w, h, access = 0;
SDLTest_CommonState *state;
int rc;
/* Initialize test framework */
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
if (!state) {
return 1;
}
state->window_flags |= SDL_WINDOW_TRANSPARENT;
state->window_flags &= ~SDL_WINDOW_RESIZABLE;
rc = 0;
/* SDL_SetHint(SDL_HINT_RENDER_DRIVER, "software"); */
/* SDL_SetHint(SDL_HINT_VIDEO_FORCE_EGL, "0"); */
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
/* Parse commandline */
for (i = 1; i < argc;) {
int consumed;
consumed = SDLTest_CommonArg(state, i);
if (!consumed) {
LoadedPicture *new_picture;
new_picture = SDL_malloc(sizeof(LoadedPicture));
new_picture->name = argv[i];
new_picture->next = picture_linked_list;
picture_linked_list = new_picture;
num_pictures++;
consumed = 1;
}
if (consumed <= 0) {
log_usage(state, argv[0]);
exit(-1);
}
i += consumed;
}
if (!num_pictures) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "testshape requires at least one bitmap file as argument.");
log_usage(state, argv[0]);
rc = -1;
goto ret;
}
if (!SDLTest_CommonInit(state)) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not initialize SDL video.");
rc = -2;
goto ret;
}
mode = SDL_GetDesktopDisplayMode(SDL_GetPrimaryDisplay());
if (!mode) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't get desktop display mode: %s", SDL_GetError());
rc = -2;
goto ret;
}
/* Allocate an array of LoadedPicture pointers for convenience accesses. */
pictures = (LoadedPicture **)SDL_malloc(sizeof(LoadedPicture*) * num_pictures);
if (!pictures) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not allocate memory.");
rc = 1;
goto ret;
}
for (i = 0, pic_i = picture_linked_list; i < num_pictures; i++, pic_i = pic_i->next) {
pictures[i] = pic_i;
pictures[i]->surface = NULL;
}
for (i = 0; i < num_pictures; i++) {
pictures[i]->surface = SDL_LoadBMP(pictures[i]->name);
if (pictures[i]->surface == NULL) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not load surface from named bitmap file: %s", pictures[i]->name);
rc = -3;
goto ret;
}
format = pictures[i]->surface->format;
if (SDL_ISPIXELFORMAT_ALPHA(format->format)) {
pictures[i]->mode.mode = ShapeModeBinarizeAlpha;
pictures[i]->mode.parameters.binarizationCutoff = 255;
} else {
pictures[i]->mode.mode = ShapeModeColorKey;
pictures[i]->mode.parameters.colorKey = black;
}
}
for (i = 0; i < num_pictures; i++) {
pictures[i]->textures = SDL_calloc(state->num_windows, sizeof(SDL_Texture *));
pictures[i]->shape_textures = SDL_calloc(state->num_windows, sizeof(SDL_Texture *));
if (!pictures[i]->textures || !pictures[i]->shape_textures) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create textures array(s).");
rc = -4;
goto ret;
}
for (j = 0; j < state->num_windows; j++) {
pictures[i]->textures[j] = SDL_CreateTextureFromSurface(state->renderers[j], pictures[i]->surface);
if (!pictures[i]->textures[j]) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Could not create textures for SDL_shape.");
rc = -5;
goto ret;
}
}
}
done = 0;
current_picture = 0;
button_down = 0;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Changing to shaped bmp: %s", pictures[current_picture]->name);
for (i = 0; i < state->num_windows; i++) {
SDL_QueryTexture(pictures[current_picture]->textures[i], &pixelFormat, &access, &w, &h);
/* We want to set the window size in pixels */
SDL_SetWindowSize(state->windows[i], (int)SDL_ceilf(w / mode->pixel_density), (int)SDL_ceilf(h / mode->pixel_density));
}
SDL3_SetWindowShape(pictures[current_picture], &pictures[current_picture]->mode);
while (!done) {
SDL_Event event;
while (SDL_PollEvent(&event)) {
SDLTest_CommonEvent(state, &event, &done);
if (event.type == SDL_EVENT_KEY_DOWN) {
button_down = 1;
}
if (button_down && event.type == SDL_EVENT_KEY_UP) {
button_down = 0;
current_picture += 1;
if (current_picture >= num_pictures) {
current_picture = 0;
}
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION, "Changing to shaped bmp: %s", pictures[current_picture]->name);
for (i = 0; i < state->num_windows; i++) {
SDL_QueryTexture(pictures[current_picture]->textures[i], &pixelFormat, &access, &w, &h);
SDL_SetWindowSize(state->windows[i], (int)SDL_ceilf(w / mode->pixel_density),(int)SDL_ceilf(h / mode->pixel_density));
SDL3_SetWindowShape(pictures[current_picture], &pictures[current_picture]->mode);
}
}
}
for (i = 0; i < state->num_windows; i++) {
render(i, state->renderers[i], pictures[current_picture]);
}
SDL_Delay(10);
}
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);
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;
SDL_Delay(100);
}
/* Success! */
return_code = 0;
quit:
SDL_DestroySurface(shape);
SDL_Quit();
return return_code;
}