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SDL_windowsframebuffer.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2010 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#include "SDL_windowsvideo.h"
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#ifndef _WIN32_WCE
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#define HAVE_GETDIBITS
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#endif
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int WIN_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format, void ** pixels, int *pitch)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
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size_t size;
LPBITMAPINFO info;
#ifdef HAVE_GETDIBITS
HBITMAP hbm;
#endif
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/* Free the old framebuffer surface */
if (data->mdc) {
DeleteDC(data->mdc);
}
if (data->hbm) {
DeleteObject(data->hbm);
}
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/* Find out the format of the screen */
size = sizeof(BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD);
info = (LPBITMAPINFO)SDL_stack_alloc(Uint8, size);
#ifdef HAVE_GETDIBITS
SDL_memset(info, 0, size);
info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
/* The second call to GetDIBits() fills in the bitfields */
hbm = CreateCompatibleBitmap(data->hdc, 1, 1);
GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
DeleteObject(hbm);
*format = SDL_PIXELFORMAT_UNKNOWN;
if (info->bmiHeader.biCompression == BI_BITFIELDS) {
Uint32 *masks;
masks = (Uint32*)((Uint8*)info + info->bmiHeader.biSize);
if (masks[0] == 0x00FF0000 && masks[2] == 0x000000FF) {
*format = SDL_PIXELFORMAT_RGB888;
} else if (masks[0] == 0x000000FF && masks[2] == 0x00FF0000) {
*format = SDL_PIXELFORMAT_BGR888;
} else if (masks[0] == 0xF800 && masks[2] == 0x001F) {
*format = SDL_PIXELFORMAT_RGB565;
} else if (masks[0] == 0x001F && masks[2] == 0xF800) {
*format = SDL_PIXELFORMAT_BGR565;
} else if (masks[0] == 0x7C00 && masks[2] == 0x001F) {
*format = SDL_PIXELFORMAT_RGB555;
} else if (masks[0] == 0x001F && masks[2] == 0x7C00) {
*format = SDL_PIXELFORMAT_BGR555;
}
}
if (*format == SDL_PIXELFORMAT_UNKNOWN)
#endif
{
/* We'll use RGB format for now */
*format = SDL_PIXELFORMAT_RGB888;
/* Create a new one */
SDL_memset(info, 0, size);
info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
info->bmiHeader.biPlanes = 1;
info->bmiHeader.biBitCount = 32;
info->bmiHeader.biCompression = BI_RGB;
}
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/* Fill in the size information */
*pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
info->bmiHeader.biWidth = window->w;
info->bmiHeader.biHeight = -window->h; /* negative for topdown bitmap */
info->bmiHeader.biSizeImage = window->h * (*pitch);
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data->mdc = CreateCompatibleDC(data->hdc);
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data->hbm = CreateDIBSection(data->hdc, info, DIB_RGB_COLORS, pixels, NULL, 0);
SDL_stack_free(info);
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if (!data->hbm) {
WIN_SetError("Unable to create DIB");
return -1;
}
SelectObject(data->mdc, data->hbm);
return 0;
}
int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window * window, int numrects, SDL_Rect * rects)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
BitBlt(data->hdc, 0, 0, window->w, window->h, data->mdc, 0, 0, SRCCOPY);
return 0;
}
void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window * window)
{
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
if (data->mdc) {
DeleteDC(data->mdc);
data->mdc = NULL;
}
if (data->hbm) {
DeleteObject(data->hbm);
data->hbm = NULL;
}
}
/* vi: set ts=4 sw=4 expandtab: */