341 lines
12 KiB
C
341 lines
12 KiB
C
/*
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Simple DirectMedia Layer
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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, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../SDL_internal.h"
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#include "SDL.h"
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#include "SDL_video.h"
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#include "SDL_sysvideo.h"
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#include "SDL_pixels.h"
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#include "SDL_surface.h"
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#include "SDL_shape.h"
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#include "SDL_shape_internals.h"
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SDL_Window *SDL_CreateShapedWindow(const char *title, unsigned int x, unsigned int y, unsigned int w, unsigned int h, Uint32 flags)
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{
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SDL_Window *result = NULL;
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result = SDL_CreateWindow(title, -1000, -1000, w, h, (flags | SDL_WINDOW_BORDERLESS) & (~SDL_WINDOW_FULLSCREEN) & (~SDL_WINDOW_RESIZABLE) /* & (~SDL_WINDOW_SHOWN) */);
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if (result != NULL) {
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if (SDL_GetVideoDevice()->shape_driver.CreateShaper == NULL) {
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SDL_DestroyWindow(result);
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return NULL;
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}
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result->shaper = SDL_GetVideoDevice()->shape_driver.CreateShaper(result);
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if (result->shaper != NULL) {
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result->shaper->userx = x;
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result->shaper->usery = y;
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result->shaper->mode.mode = ShapeModeDefault;
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result->shaper->mode.parameters.binarizationCutoff = 1;
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result->shaper->hasshape = SDL_FALSE;
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return result;
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} else {
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SDL_DestroyWindow(result);
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return NULL;
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}
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}
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return NULL;
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}
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SDL_bool SDL_IsShapedWindow(const SDL_Window *window)
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{
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if (window == NULL) {
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return SDL_FALSE;
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}
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return (SDL_bool)(window->shaper != NULL);
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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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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 SDL_ShapeTree *RecursivelyCalculateShapeTree(SDL_WindowShapeMode mode, SDL_Surface *mask, SDL_Rect dimensions)
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{
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int x = 0, y = 0;
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Uint8 *pixel = NULL;
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Uint32 pixel_value = 0;
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Uint8 r = 0, g = 0, b = 0, a = 0;
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SDL_bool pixel_opaque = SDL_FALSE;
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int last_opaque = -1;
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SDL_Color key;
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SDL_ShapeTree *result = (SDL_ShapeTree *)SDL_malloc(sizeof(SDL_ShapeTree));
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SDL_Rect next = { 0, 0, 0, 0 };
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if (result == NULL) {
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SDL_OutOfMemory();
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return NULL;
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}
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for (y = dimensions.y; y < dimensions.y + dimensions.h; y++) {
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for (x = dimensions.x; x < dimensions.x + dimensions.w; x++) {
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pixel_value = 0;
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pixel = (Uint8 *)(mask->pixels) + (y * mask->pitch) + (x * mask->format->BytesPerPixel);
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switch (mask->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 & (~mask->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, mask->format, &r, &g, &b, &a);
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switch (mode.mode) {
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case (ShapeModeDefault):
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pixel_opaque = (a >= 1 ? SDL_TRUE : SDL_FALSE);
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break;
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case (ShapeModeBinarizeAlpha):
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pixel_opaque = (a >= mode.parameters.binarizationCutoff ? SDL_TRUE : SDL_FALSE);
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break;
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case (ShapeModeReverseBinarizeAlpha):
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pixel_opaque = (a <= mode.parameters.binarizationCutoff ? SDL_TRUE : SDL_FALSE);
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break;
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case (ShapeModeColorKey):
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key = mode.parameters.colorKey;
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pixel_opaque = ((key.r != r || key.g != g || key.b != b) ? SDL_TRUE : SDL_FALSE);
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break;
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}
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if (last_opaque == -1) {
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last_opaque = pixel_opaque;
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}
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if (last_opaque != pixel_opaque) {
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const int halfwidth = dimensions.w / 2;
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const int halfheight = dimensions.h / 2;
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result->kind = QuadShape;
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next.x = dimensions.x;
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next.y = dimensions.y;
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next.w = halfwidth;
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next.h = halfheight;
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result->data.children.upleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode, mask, next);
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next.x = dimensions.x + halfwidth;
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next.w = dimensions.w - halfwidth;
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result->data.children.upright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode, mask, next);
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next.x = dimensions.x;
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next.w = halfwidth;
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next.y = dimensions.y + halfheight;
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next.h = dimensions.h - halfheight;
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result->data.children.downleft = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode, mask, next);
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next.x = dimensions.x + halfwidth;
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next.w = dimensions.w - halfwidth;
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result->data.children.downright = (struct SDL_ShapeTree *)RecursivelyCalculateShapeTree(mode, mask, next);
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return result;
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}
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}
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}
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/* If we never recursed, all the pixels in this quadrant have the same "value". */
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result->kind = (last_opaque == SDL_TRUE ? OpaqueShape : TransparentShape);
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result->data.shape = dimensions;
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return result;
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}
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SDL_ShapeTree *SDL_CalculateShapeTree(SDL_WindowShapeMode mode, SDL_Surface *shape)
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{
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SDL_Rect dimensions;
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SDL_ShapeTree *result = NULL;
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dimensions.x = 0;
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dimensions.y = 0;
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dimensions.w = shape->w;
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dimensions.h = shape->h;
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if (SDL_MUSTLOCK(shape)) {
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SDL_LockSurface(shape);
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}
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result = RecursivelyCalculateShapeTree(mode, shape, dimensions);
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if (SDL_MUSTLOCK(shape)) {
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SDL_UnlockSurface(shape);
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}
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return result;
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}
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void SDL_TraverseShapeTree(SDL_ShapeTree *tree, SDL_TraversalFunction function, void *closure)
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{
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SDL_assert(tree != NULL);
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if (tree->kind == QuadShape) {
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SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upleft, function, closure);
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SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upright, function, closure);
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SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downleft, function, closure);
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SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.downright, function, closure);
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} else {
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function(tree, closure);
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}
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}
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void SDL_FreeShapeTree(SDL_ShapeTree **shape_tree)
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{
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if ((*shape_tree)->kind == QuadShape) {
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SDL_FreeShapeTree((SDL_ShapeTree **)(char *)&(*shape_tree)->data.children.upleft);
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SDL_FreeShapeTree((SDL_ShapeTree **)(char *)&(*shape_tree)->data.children.upright);
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SDL_FreeShapeTree((SDL_ShapeTree **)(char *)&(*shape_tree)->data.children.downleft);
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SDL_FreeShapeTree((SDL_ShapeTree **)(char *)&(*shape_tree)->data.children.downright);
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}
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SDL_free(*shape_tree);
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*shape_tree = NULL;
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}
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int SDL_SetWindowShape(SDL_Window *window, SDL_Surface *shape, SDL_WindowShapeMode *shape_mode)
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{
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SDL_VideoDevice *_this = SDL_GetVideoDevice();
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int result;
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if (window == NULL || !SDL_IsShapedWindow(window)) {
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/* The window given was not a shapeable window. */
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return SDL_NONSHAPEABLE_WINDOW;
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}
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if (shape == NULL) {
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/* Invalid shape argument. */
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return SDL_INVALID_SHAPE_ARGUMENT;
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}
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if (shape_mode != NULL) {
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window->shaper->mode = *shape_mode;
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}
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result = _this->shape_driver.SetWindowShape(window->shaper, shape, shape_mode);
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window->shaper->hasshape = SDL_TRUE;
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if (window->shaper->userx != 0 && window->shaper->usery != 0) {
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int x = window->shaper->userx;
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int y = window->shaper->usery;
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if (SDL_WINDOWPOS_ISUNDEFINED(x) || SDL_WINDOWPOS_ISUNDEFINED(y) ||
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SDL_WINDOWPOS_ISCENTERED(x) || SDL_WINDOWPOS_ISCENTERED(y)) {
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int displayIndex;
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SDL_Rect bounds;
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if (SDL_WINDOWPOS_ISUNDEFINED(x) || SDL_WINDOWPOS_ISCENTERED(x)) {
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displayIndex = (x & 0xFFFF);
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if (displayIndex >= _this->num_displays) {
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displayIndex = 0;
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}
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} else {
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displayIndex = (y & 0xFFFF);
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if (displayIndex >= _this->num_displays) {
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displayIndex = 0;
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}
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}
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SDL_GetDisplayBounds(displayIndex, &bounds);
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if (SDL_WINDOWPOS_ISUNDEFINED(x) || SDL_WINDOWPOS_ISCENTERED(x)) {
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window->x = bounds.x + (bounds.w - window->w) / 2;
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}
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if (SDL_WINDOWPOS_ISUNDEFINED(y) || SDL_WINDOWPOS_ISCENTERED(y)) {
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window->y = bounds.y + (bounds.h - window->h) / 2;
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}
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}
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SDL_SetWindowPosition(window, x, y);
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window->shaper->userx = 0;
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window->shaper->usery = 0;
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}
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return result;
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}
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static SDL_bool SDL_WindowHasAShape(SDL_Window *window)
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{
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if (window == NULL || !SDL_IsShapedWindow(window)) {
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return SDL_FALSE;
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}
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return window->shaper->hasshape;
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}
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int SDL_GetShapedWindowMode(SDL_Window *window, SDL_WindowShapeMode *shape_mode)
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{
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if (window != NULL && SDL_IsShapedWindow(window)) {
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if (shape_mode == NULL) {
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if (SDL_WindowHasAShape(window)) {
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return 0; /* The window given has a shape. */
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} else {
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return SDL_WINDOW_LACKS_SHAPE; /* The window given is shapeable but lacks a shape. */
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}
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} else {
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*shape_mode = window->shaper->mode;
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return 0;
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}
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}
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return SDL_NONSHAPEABLE_WINDOW; /* The window given is not a valid shapeable window. */
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}
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