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SDL_svgavideo.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2010 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* SVGAlib based SDL video driver implementation.
*/
#include <unistd.h>
#include <sys/stat.h>
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#include <sys/types.h>
#include <sys/ioctl.h>
#include <fcntl.h>
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#if defined(__LINUX__)
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#include <linux/vt.h>
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#elif defined(__FREEBSD__)
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#include <sys/consio.h>
#else
#error You must choose your operating system here
#endif
#include <vga.h>
#include <vgamouse.h>
#include <vgakeyboard.h>
#include "SDL_video.h"
#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
#include "../SDL_pixels_c.h"
#include "../../events/SDL_events_c.h"
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#include "SDL_svgavideo.h"
#include "SDL_svgaevents_c.h"
#include "SDL_svgamouse_c.h"
/* Initialization/Query functions */
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static int SVGA_VideoInit(_THIS, SDL_PixelFormat * vformat);
static SDL_Rect **SVGA_ListModes(_THIS, SDL_PixelFormat * format,
Uint32 flags);
static SDL_Surface *SVGA_SetVideoMode(_THIS, SDL_Surface * current,
int width, int height, int bpp,
Uint32 flags);
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static int SVGA_SetColors(_THIS, int firstcolor, int ncolors,
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SDL_Color * colors);
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static void SVGA_VideoQuit(_THIS);
/* Hardware surface functions */
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static int SVGA_AllocHWSurface(_THIS, SDL_Surface * surface);
static int SVGA_LockHWSurface(_THIS, SDL_Surface * surface);
static int SVGA_FlipHWSurface(_THIS, SDL_Surface * surface);
static void SVGA_UnlockHWSurface(_THIS, SDL_Surface * surface);
static void SVGA_FreeHWSurface(_THIS, SDL_Surface * surface);
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/* SVGAlib driver bootstrap functions */
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static int
SVGA_Available(void)
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{
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/* Check to see if we are root and stdin is a virtual console */
int console;
/* SVGALib 1.9.x+ doesn't require root (via /dev/svga) */
int svgalib2 = -1;
/* See if we are connected to a virtual terminal */
console = STDIN_FILENO;
#if 0 /* This is no longer needed, SVGAlib can switch consoles for us */
if (console >= 0) {
struct stat sb;
struct vt_mode dummy;
if ((fstat(console, &sb) < 0) ||
(ioctl(console, VT_GETMODE, &dummy) < 0)) {
console = -1;
}
}
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#endif /* 0 */
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/* See if SVGAlib 2.0 is available */
svgalib2 = open("/dev/svga", O_RDONLY);
if (svgalib2 != -1) {
close(svgalib2);
}
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return (((svgalib2 != -1) || (geteuid() == 0)) && (console >= 0));
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}
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static void
SVGA_DeleteDevice(SDL_VideoDevice * device)
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{
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SDL_free(device->hidden);
SDL_free(device);
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}
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static SDL_VideoDevice *
SVGA_CreateDevice(int devindex)
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{
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SDL_VideoDevice *device;
/* Initialize all variables that we clean on shutdown */
device = (SDL_VideoDevice *) SDL_malloc(sizeof(SDL_VideoDevice));
if (device) {
SDL_memset(device, 0, (sizeof *device));
device->hidden = (struct SDL_PrivateVideoData *)
SDL_malloc((sizeof *device->hidden));
}
if ((device == NULL) || (device->hidden == NULL)) {
SDL_OutOfMemory();
if (device) {
SDL_free(device);
}
return (0);
}
SDL_memset(device->hidden, 0, (sizeof *device->hidden));
/* Set the function pointers */
device->VideoInit = SVGA_VideoInit;
device->ListModes = SVGA_ListModes;
device->SetVideoMode = SVGA_SetVideoMode;
device->SetColors = SVGA_SetColors;
device->UpdateRects = NULL;
device->VideoQuit = SVGA_VideoQuit;
device->AllocHWSurface = SVGA_AllocHWSurface;
device->CheckHWBlit = NULL;
device->FillHWRect = NULL;
device->SetHWColorKey = NULL;
device->SetHWAlpha = NULL;
device->LockHWSurface = SVGA_LockHWSurface;
device->UnlockHWSurface = SVGA_UnlockHWSurface;
device->FlipHWSurface = SVGA_FlipHWSurface;
device->FreeHWSurface = SVGA_FreeHWSurface;
device->SetCaption = NULL;
device->SetIcon = NULL;
device->IconifyWindow = NULL;
device->GrabInput = NULL;
device->GetWMInfo = NULL;
device->InitOSKeymap = SVGA_InitOSKeymap;
device->PumpEvents = SVGA_PumpEvents;
device->free = SVGA_DeleteDevice;
return device;
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}
VideoBootStrap SVGALIB_bootstrap = {
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"svgalib", "SVGAlib",
SVGA_Available, SVGA_CreateDevice
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};
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static int
SVGA_AddMode(_THIS, int mode, int actually_add)
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{
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int i, j;
vga_modeinfo *modeinfo;
modeinfo = vga_getmodeinfo(mode);
i = modeinfo->bytesperpixel - 1;
if (i < 0) {
return 0;
}
if (actually_add) {
SDL_Rect saved_rect[2];
int saved_mode[2];
int b;
/* Add the mode, sorted largest to smallest */
b = 0;
j = 0;
while ((SDL_modelist[i][j]->w > modeinfo->width) ||
(SDL_modelist[i][j]->h > modeinfo->height)) {
++j;
}
/* Skip modes that are already in our list */
if ((SDL_modelist[i][j]->w == modeinfo->width) &&
(SDL_modelist[i][j]->h == modeinfo->height)) {
return (0);
}
/* Insert the new mode */
saved_rect[b] = *SDL_modelist[i][j];
saved_mode[b] = SDL_vgamode[i][j];
SDL_modelist[i][j]->w = modeinfo->width;
SDL_modelist[i][j]->h = modeinfo->height;
SDL_vgamode[i][j] = mode;
/* Everybody scoot down! */
if (saved_rect[b].w && saved_rect[b].h) {
for (++j; SDL_modelist[i][j]->w; ++j) {
saved_rect[!b] = *SDL_modelist[i][j];
saved_mode[!b] = SDL_vgamode[i][j];
*SDL_modelist[i][j] = saved_rect[b];
SDL_vgamode[i][j] = saved_mode[b];
b = !b;
}
*SDL_modelist[i][j] = saved_rect[b];
SDL_vgamode[i][j] = saved_mode[b];
}
} else {
++SDL_nummodes[i];
}
return (1);
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}
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static void
SVGA_UpdateVideoInfo(_THIS)
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{
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vga_modeinfo *modeinfo;
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this->info.wm_available = 0;
this->info.hw_available = (banked ? 0 : 1);
modeinfo = vga_getmodeinfo(vga_getcurrentmode());
this->info.video_mem = modeinfo->memory;
/* FIXME: Add hardware accelerated blit information */
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#ifdef SVGALIB_DEBUG
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printf("Hardware accelerated blit: %savailable\n",
modeinfo->haveblit ? "" : "not ");
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#endif
}
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int
SVGA_VideoInit(_THIS, SDL_PixelFormat * vformat)
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{
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int keyboard;
int i, j;
int mode, total_modes;
/* Initialize all variables that we clean on shutdown */
for (i = 0; i < NUM_MODELISTS; ++i) {
SDL_nummodes[i] = 0;
SDL_modelist[i] = NULL;
SDL_vgamode[i] = NULL;
}
/* Initialize the library */
vga_disabledriverreport();
if (vga_init() < 0) {
SDL_SetError("Unable to initialize SVGAlib");
return (-1);
}
vga_setmode(TEXT);
/* Enable mouse and keyboard support */
vga_setmousesupport(1);
keyboard = keyboard_init_return_fd();
if (keyboard < 0) {
SDL_SetError("Unable to initialize keyboard");
return (-1);
}
if (SVGA_initkeymaps(keyboard) < 0) {
return (-1);
}
keyboard_seteventhandler(SVGA_keyboardcallback);
/* Determine the current screen size */
this->info.current_w = 0;
this->info.current_h = 0;
/* Determine the screen depth (use default 8-bit depth) */
vformat->BitsPerPixel = 8;
/* Enumerate the available fullscreen modes */
total_modes = 0;
for (mode = vga_lastmodenumber(); mode; --mode) {
if (vga_hasmode(mode)) {
if (SVGA_AddMode(this, mode, 0)) {
++total_modes;
}
}
}
if (SVGA_AddMode(this, G320x200x256, 0))
++total_modes;
if (total_modes == 0) {
SDL_SetError("No linear video modes available");
return (-1);
}
for (i = 0; i < NUM_MODELISTS; ++i) {
SDL_vgamode[i] = (int *) SDL_malloc(SDL_nummodes[i] * sizeof(int));
if (SDL_vgamode[i] == NULL) {
SDL_OutOfMemory();
return (-1);
}
SDL_modelist[i] = (SDL_Rect **)
SDL_malloc((SDL_nummodes[i] + 1) * sizeof(SDL_Rect *));
if (SDL_modelist[i] == NULL) {
SDL_OutOfMemory();
return (-1);
}
for (j = 0; j < SDL_nummodes[i]; ++j) {
SDL_modelist[i][j] = (SDL_Rect *) SDL_malloc(sizeof(SDL_Rect));
if (SDL_modelist[i][j] == NULL) {
SDL_OutOfMemory();
return (-1);
}
SDL_memset(SDL_modelist[i][j], 0, sizeof(SDL_Rect));
}
SDL_modelist[i][j] = NULL;
}
for (mode = vga_lastmodenumber(); mode; --mode) {
if (vga_hasmode(mode)) {
SVGA_AddMode(this, mode, 1);
}
}
SVGA_AddMode(this, G320x200x256, 1);
/* Free extra (duplicated) modes */
for (i = 0; i < NUM_MODELISTS; ++i) {
j = 0;
while (SDL_modelist[i][j] && SDL_modelist[i][j]->w) {
j++;
}
while (SDL_modelist[i][j]) {
SDL_free(SDL_modelist[i][j]);
SDL_modelist[i][j] = NULL;
j++;
}
}
/* Fill in our hardware acceleration capabilities */
SVGA_UpdateVideoInfo(this);
/* We're done! */
return (0);
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}
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SDL_Rect **
SVGA_ListModes(_THIS, SDL_PixelFormat * format, Uint32 flags)
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{
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return (SDL_modelist[((format->BitsPerPixel + 7) / 8) - 1]);
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}
/* Various screen update functions available */
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static void SVGA_DirectUpdate(_THIS, int numrects, SDL_Rect * rects);
static void SVGA_BankedUpdate(_THIS, int numrects, SDL_Rect * rects);
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SDL_Surface *
SVGA_SetVideoMode(_THIS, SDL_Surface * current,
int width, int height, int bpp, Uint32 flags)
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{
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int mode;
int vgamode;
vga_modeinfo *modeinfo;
int screenpage_len;
/* Free old pixels if we were in banked mode */
if (banked && current->pixels) {
free(current->pixels);
current->pixels = NULL;
}
/* Try to set the requested linear video mode */
bpp = (bpp + 7) / 8 - 1;
for (mode = 0; SDL_modelist[bpp][mode]; ++mode) {
if ((SDL_modelist[bpp][mode]->w == width) &&
(SDL_modelist[bpp][mode]->h == height)) {
break;
}
}
if (SDL_modelist[bpp][mode] == NULL) {
SDL_SetError("Couldn't find requested mode in list");
return (NULL);
}
vgamode = SDL_vgamode[bpp][mode];
vga_setmode(vgamode);
vga_setpage(0);
if ((vga_setlinearaddressing() < 0) && (vgamode != G320x200x256)) {
banked = 1;
} else {
banked = 0;
}
modeinfo = vga_getmodeinfo(SDL_vgamode[bpp][mode]);
/* Update hardware acceleration info */
SVGA_UpdateVideoInfo(this);
/* Allocate the new pixel format for the screen */
bpp = (bpp + 1) * 8;
if ((bpp == 16) && (modeinfo->colors == 32768)) {
bpp = 15;
}
if (!SDL_ReallocFormat(current, bpp, 0, 0, 0, 0)) {
return (NULL);
}
/* Set up the new mode framebuffer */
current->flags = SDL_FULLSCREEN;
if (!banked) {
current->flags |= SDL_HWSURFACE;
}
if (bpp == 8) {
/* FIXME: What about DirectColor? */
current->flags |= SDL_HWPALETTE;
}
current->w = width;
current->h = height;
current->pitch = modeinfo->linewidth;
if (banked) {
current->pixels = SDL_malloc(current->h * current->pitch);
if (!current->pixels) {
SDL_OutOfMemory();
return (NULL);
}
} else {
current->pixels = vga_getgraphmem();
}
/* set double-buffering */
if ((flags & SDL_DOUBLEBUF) && !banked) {
/* length of one screen page in bytes */
screenpage_len = current->h * modeinfo->linewidth;
/* if start address should be aligned */
if (modeinfo->linewidth_unit) {
if (screenpage_len % modeinfo->linewidth_unit) {
screenpage_len +=
modeinfo->linewidth_unit -
(screenpage_len % modeinfo->linewidth_unit);
}
}
/* if we heve enough videomemory = ak je dost videopamete */
if (modeinfo->memory > (screenpage_len * 2 / 1024)) {
current->flags |= SDL_DOUBLEBUF;
flip_page = 0;
flip_offset[0] = 0;
flip_offset[1] = screenpage_len;
flip_address[0] = vga_getgraphmem();
flip_address[1] = flip_address[0] + screenpage_len;
SVGA_FlipHWSurface(this, current);
}
}
/* Set the blit function */
if (banked) {
this->UpdateRects = SVGA_BankedUpdate;
} else {
this->UpdateRects = SVGA_DirectUpdate;
}
/* Set up the mouse handler again (buggy SVGAlib 1.40) */
mouse_seteventhandler(SVGA_mousecallback);
/* We're done */
return (current);
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}
/* We don't actually allow hardware surfaces other than the main one */
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static int
SVGA_AllocHWSurface(_THIS, SDL_Surface * surface)
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{
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return (-1);
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}
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static void
SVGA_FreeHWSurface(_THIS, SDL_Surface * surface)
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{
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return;
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}
/* We need to wait for vertical retrace on page flipped displays */
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static int
SVGA_LockHWSurface(_THIS, SDL_Surface * surface)
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{
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/* The waiting is done in SVGA_FlipHWSurface() */
return (0);
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}
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static void
SVGA_UnlockHWSurface(_THIS, SDL_Surface * surface)
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{
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return;
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}
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static int
SVGA_FlipHWSurface(_THIS, SDL_Surface * surface)
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{
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if (!banked) {
vga_setdisplaystart(flip_offset[flip_page]);
flip_page = !flip_page;
surface->pixels = flip_address[flip_page];
vga_waitretrace();
}
return (0);
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}
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static void
SVGA_DirectUpdate(_THIS, int numrects, SDL_Rect * rects)
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{
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return;
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}
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static void
SVGA_BankedUpdate(_THIS, int numrects, SDL_Rect * rects)
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{
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int i, j;
SDL_Rect *rect;
int page, vp;
int x, y, w, h;
unsigned char *src;
unsigned char *dst;
int bpp = this->screen->format->BytesPerPixel;
int pitch = this->screen->pitch;
dst = vga_getgraphmem();
for (i = 0; i < numrects; ++i) {
rect = &rects[i];
x = rect->x;
y = rect->y;
w = rect->w * bpp;
h = rect->h;
vp = y * pitch + x * bpp;
src = (unsigned char *) this->screen->pixels + vp;
page = vp >> 16;
vp &= 0xffff;
vga_setpage(page);
for (j = 0; j < h; j++) {
if (vp + w > 0x10000) {
if (vp >= 0x10000) {
page++;
vga_setpage(page);
vp &= 0xffff;
} else {
SDL_memcpy(dst + vp, src, 0x10000 - vp);
page++;
vga_setpage(page);
SDL_memcpy(dst, src + 0x10000 - vp, (vp + w) & 0xffff);
vp = (vp + pitch) & 0xffff;
src += pitch;
continue;
}
}
SDL_memcpy(dst + vp, src, w);
src += pitch;
vp += pitch;
}
}
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}
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int
SVGA_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color * colors)
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{
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int i;
for (i = 0; i < ncolors; i++) {
vga_setpalette(firstcolor + i,
colors[i].r >> 2, colors[i].g >> 2, colors[i].b >> 2);
}
return (1);
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}
/* Note: If we are terminated, this could be called in the middle of
another SDL video routine -- notably UpdateRects.
*/
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void
SVGA_VideoQuit(_THIS)
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{
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int i, j;
/* Reset the console video mode */
if (this->screen && (this->screen->w && this->screen->h)) {
vga_setmode(TEXT);
}
keyboard_close();
/* Free video mode lists */
for (i = 0; i < NUM_MODELISTS; ++i) {
if (SDL_modelist[i] != NULL) {
for (j = 0; SDL_modelist[i][j]; ++j)
SDL_free(SDL_modelist[i][j]);
SDL_free(SDL_modelist[i]);
SDL_modelist[i] = NULL;
}
if (SDL_vgamode[i] != NULL) {
SDL_free(SDL_vgamode[i]);
SDL_vgamode[i] = NULL;
}
}
if (this->screen) {
if (banked && this->screen->pixels) {
SDL_free(this->screen->pixels);
}
this->screen->pixels = NULL;
}
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}
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/* vi: set ts=4 sw=4 expandtab: */