SDL 2.0
SDL_windowsframebuffer.c
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1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21#include "../../SDL_internal.h"
22
23#if SDL_VIDEO_DRIVER_WINDOWS
24
25#include "SDL_windowsvideo.h"
26
28{
29 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
30 SDL_bool isstack;
31 size_t size;
32 LPBITMAPINFO info;
33 HBITMAP hbm;
34
35 /* Free the old framebuffer surface */
36 if (data->mdc) {
37 DeleteDC(data->mdc);
38 }
39 if (data->hbm) {
40 DeleteObject(data->hbm);
41 }
42
43 /* Find out the format of the screen */
44 size = sizeof(BITMAPINFOHEADER) + 256 * sizeof (RGBQUAD);
45 info = (LPBITMAPINFO)SDL_small_alloc(Uint8, size, &isstack);
46 if (!info) {
47 return SDL_OutOfMemory();
48 }
49
50 SDL_memset(info, 0, size);
51 info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
52
53 /* The second call to GetDIBits() fills in the bitfields */
54 hbm = CreateCompatibleBitmap(data->hdc, 1, 1);
55 GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
56 GetDIBits(data->hdc, hbm, 0, 0, NULL, info, DIB_RGB_COLORS);
57 DeleteObject(hbm);
58
60 if (info->bmiHeader.biCompression == BI_BITFIELDS) {
61 int bpp;
62 Uint32 *masks;
63
64 bpp = info->bmiHeader.biPlanes * info->bmiHeader.biBitCount;
65 masks = (Uint32*)((Uint8*)info + info->bmiHeader.biSize);
66 *format = SDL_MasksToPixelFormatEnum(bpp, masks[0], masks[1], masks[2], 0);
67 }
69 {
70 /* We'll use RGB format for now */
72
73 /* Create a new one */
74 SDL_memset(info, 0, size);
75 info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
76 info->bmiHeader.biPlanes = 1;
77 info->bmiHeader.biBitCount = 32;
78 info->bmiHeader.biCompression = BI_RGB;
79 }
80
81 /* Fill in the size information */
82 *pitch = (((window->w * SDL_BYTESPERPIXEL(*format)) + 3) & ~3);
83 info->bmiHeader.biWidth = window->w;
84 info->bmiHeader.biHeight = -window->h; /* negative for topdown bitmap */
85 info->bmiHeader.biSizeImage = window->h * (*pitch);
86
87 data->mdc = CreateCompatibleDC(data->hdc);
88 data->hbm = CreateDIBSection(data->hdc, info, DIB_RGB_COLORS, pixels, NULL, 0);
89 SDL_small_free(info, isstack);
90
91 if (!data->hbm) {
92 return WIN_SetError("Unable to create DIB");
93 }
94 SelectObject(data->mdc, data->hbm);
95
96 return 0;
97}
98
100{
101 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
102
103 BitBlt(data->hdc, 0, 0, window->w, window->h, data->mdc, 0, 0, SRCCOPY);
104 return 0;
105}
106
108{
109 SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
110
111 if (!data) {
112 /* The window wasn't fully initialized */
113 return;
114 }
115
116 if (data->mdc) {
117 DeleteDC(data->mdc);
118 data->mdc = NULL;
119 }
120 if (data->hbm) {
121 DeleteObject(data->hbm);
122 data->hbm = NULL;
123 }
124}
125
126#endif /* SDL_VIDEO_DRIVER_WINDOWS */
127
128/* vi: set ts=4 sw=4 expandtab: */
#define _THIS
#define BI_BITFIELDS
Definition: SDL_bmp.c:48
#define BI_RGB
Definition: SDL_bmp.c:45
#define SDL_memset
#define SDL_MasksToPixelFormatEnum
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
#define SDL_small_alloc(type, count, pisstack)
Definition: SDL_internal.h:39
#define SDL_small_free(ptr, isstack)
Definition: SDL_internal.h:40
GLint GLint GLsizei GLsizei GLsizei GLint GLenum GLenum const GLvoid * pixels
Definition: SDL_opengl.h:1572
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
Definition: SDL_opengl.h:1572
GLsizeiptr size
#define SDL_BYTESPERPIXEL(X)
Definition: SDL_pixels.h:128
@ SDL_PIXELFORMAT_RGB888
Definition: SDL_pixels.h:236
@ SDL_PIXELFORMAT_UNKNOWN
Definition: SDL_pixels.h:173
SDL_bool
Definition: SDL_stdinc.h:162
uint32_t Uint32
Definition: SDL_stdinc.h:203
uint8_t Uint8
Definition: SDL_stdinc.h:179
int WIN_SetError(const char *prefix)
void WIN_DestroyWindowFramebuffer(_THIS, SDL_Window *window)
int WIN_UpdateWindowFramebuffer(_THIS, SDL_Window *window, const SDL_Rect *rects, int numrects)
int WIN_CreateWindowFramebuffer(_THIS, SDL_Window *window, Uint32 *format, void **pixels, int *pitch)
#define NULL
Definition: begin_code.h:167
EGLSurface EGLNativeWindowType * window
Definition: eglext.h:1025
EGLSurface EGLint * rects
Definition: eglext.h:282
A rectangle, with the origin at the upper left (integer).
Definition: SDL_rect.h:78
The type used to identify a window.
Definition: SDL_sysvideo.h:74