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96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 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_surface_utils.h"
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#include "../SDL_surface_c.h"
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HICON CreateIconFromSurface(SDL_Surface *surface)
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{
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SDL_Surface *s = SDL_ConvertSurface(surface, SDL_PIXELFORMAT_RGBA32);
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if (!s) {
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return NULL;
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}
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/* The dimensions will be needed after s is freed */
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const int width = s->w;
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const int height = s->h;
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BITMAPINFO bmpInfo;
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SDL_zero(bmpInfo);
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bmpInfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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bmpInfo.bmiHeader.biWidth = width;
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bmpInfo.bmiHeader.biHeight = -height; /* Top-down bitmap */
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bmpInfo.bmiHeader.biPlanes = 1;
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bmpInfo.bmiHeader.biBitCount = 32;
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bmpInfo.bmiHeader.biCompression = BI_RGB;
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HDC hdc = GetDC(NULL);
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void* pBits = NULL;
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HBITMAP hBitmap = CreateDIBSection(hdc, &bmpInfo, DIB_RGB_COLORS, &pBits, NULL, 0);
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if (!hBitmap) {
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ReleaseDC(NULL, hdc);
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SDL_DestroySurface(s);
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return NULL;
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}
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SDL_memcpy(pBits, s->pixels, width * height * 4);
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SDL_DestroySurface(s);
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HBITMAP hMask = CreateBitmap(width, height, 1, 1, NULL);
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if (!hMask) {
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DeleteObject(hBitmap);
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ReleaseDC(NULL, hdc);
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return NULL;
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}
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HDC hdcMem = CreateCompatibleDC(hdc);
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HGDIOBJ oldBitmap = SelectObject(hdcMem, hMask);
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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BYTE* pixel = (BYTE*)pBits + (y * width + x) * 4;
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BYTE alpha = pixel[3];
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COLORREF maskColor = (alpha == 0) ? RGB(0, 0, 0) : RGB(255, 255, 255);
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SetPixel(hdcMem, x, y, maskColor);
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}
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}
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ICONINFO iconInfo;
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iconInfo.fIcon = TRUE;
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iconInfo.xHotspot = 0;
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iconInfo.yHotspot = 0;
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iconInfo.hbmMask = hMask;
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iconInfo.hbmColor = hBitmap;
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HICON hIcon = CreateIconIndirect(&iconInfo);
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SelectObject(hdcMem, oldBitmap);
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DeleteDC(hdcMem);
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DeleteObject(hBitmap);
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DeleteObject(hMask);
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ReleaseDC(NULL, hdc);
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return hIcon;
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}
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