/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 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

*/

/* AAlib based SDL video driver implementation.

*/

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <sys/stat.h>

#include "SDL.h"

#include "SDL_error.h"

#include "SDL_video.h"

#include "SDL_mouse.h"

#include "SDL_sysvideo.h"

#include "SDL_pixels_c.h"

#include "SDL_events_c.h"

#include "SDL_aavideo.h"

#include "SDL_aaevents_c.h"

#include "SDL_aamouse_c.h"

#include <aalib.h>

/* Initialization/Query functions */

static int AA_VideoInit(_THIS, SDL_PixelFormat *vformat);

static SDL_Rect **AA_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);

static SDL_Surface *AA_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);

static int AA_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);

static void AA_VideoQuit(_THIS);

/* Hardware surface functions */

static int AA_AllocHWSurface(_THIS, SDL_Surface *surface);

static int AA_LockHWSurface(_THIS, SDL_Surface *surface);

static int AA_FlipHWSurface(_THIS, SDL_Surface *surface);

static void AA_UnlockHWSurface(_THIS, SDL_Surface *surface);

static void AA_FreeHWSurface(_THIS, SDL_Surface *surface);

/* Cache the VideoDevice struct */

static struct SDL_VideoDevice *local_this;

/* AAlib driver bootstrap functions */

static int AA_Available(void)

{

return 1; /* Always available ! */

}

static void AA_DeleteDevice(SDL_VideoDevice *device)

{

free(device->hidden);

free(device);

}

static SDL_VideoDevice *AA_CreateDevice(int devindex)

{

SDL_VideoDevice *device;

/* Initialize all variables that we clean on shutdown */

device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));

if ( device ) {

memset(device, 0, (sizeof *device));

device->hidden = (struct SDL_PrivateVideoData *)

malloc((sizeof *device->hidden));

}

if ( (device == NULL) || (device->hidden == NULL) ) {

SDL_OutOfMemory();

if ( device ) {

free(device);

}

return(0);

}

memset(device->hidden, 0, (sizeof *device->hidden));

/* Set the function pointers */

device->VideoInit = AA_VideoInit;

device->ListModes = AA_ListModes;

device->SetVideoMode = AA_SetVideoMode;

device->CreateYUVOverlay = NULL;

device->SetColors = AA_SetColors;

device->UpdateRects = NULL;

device->VideoQuit = AA_VideoQuit;

device->AllocHWSurface = AA_AllocHWSurface;

device->CheckHWBlit = NULL;

device->FillHWRect = NULL;

device->SetHWColorKey = NULL;

device->SetHWAlpha = NULL;

device->LockHWSurface = AA_LockHWSurface;

device->UnlockHWSurface = AA_UnlockHWSurface;

device->FlipHWSurface = NULL;

device->FreeHWSurface = AA_FreeHWSurface;

device->SetCaption = NULL;

device->SetIcon = NULL;

device->IconifyWindow = NULL;

device->GrabInput = NULL;

device->GetWMInfo = NULL;

device->InitOSKeymap = AA_InitOSKeymap;

device->PumpEvents = AA_PumpEvents;

device->free = AA_DeleteDevice;

return device;

}

VideoBootStrap AALIB_bootstrap = {

"aalib", "ASCII Art Library",

AA_Available, AA_CreateDevice

};

static void AA_ResizeHandler(aa_context *);

int AA_VideoInit(_THIS, SDL_PixelFormat *vformat)

{

int keyboard;

int i;

/* Initialize all variables that we clean on shutdown */

for ( i=0; i<SDL_NUMMODES; ++i ) {

SDL_modelist[i] = malloc(sizeof(SDL_Rect));

SDL_modelist[i]->x = SDL_modelist[i]->y = 0;

}

/* Modes sorted largest to smallest */

SDL_modelist[0]->w = 1024; SDL_modelist[0]->h = 768;

SDL_modelist[1]->w = 800; SDL_modelist[1]->h = 600;

SDL_modelist[2]->w = 640; SDL_modelist[2]->h = 480;

SDL_modelist[3]->w = 320; SDL_modelist[3]->h = 400;

SDL_modelist[4]->w = 320; SDL_modelist[4]->h = 240;

SDL_modelist[5]->w = 320; SDL_modelist[5]->h = 200;

SDL_modelist[6] = NULL;

/* Initialize the library */

AA_mutex = SDL_CreateMutex();

aa_parseoptions (NULL, NULL, NULL, NULL);

AA_context = aa_autoinit(&aa_defparams);

if ( ! AA_context ) {

SDL_SetError("Unable to initialize AAlib");

return(-1);

}

/* Enable mouse and keyboard support */

if ( ! aa_autoinitkbd (AA_context, AA_SENDRELEASE) ) {

SDL_SetError("Unable to initialize AAlib keyboard");

return(-1);

}

if ( ! aa_autoinitmouse (AA_context, AA_SENDRELEASE) ) {

fprintf(stderr,"Warning: Unable to initialize AAlib mouse");

}

AA_rparams = aa_getrenderparams();

local_this = this;

aa_resizehandler(AA_context, AA_ResizeHandler);

fprintf(stderr,"Using AAlib driver: %s (%s)\n", AA_context->driver->name, AA_context->driver->shortname);

AA_in_x11 = (strcmp(AA_context->driver->shortname,"X11") == 0);

/* Determine the screen depth (use default 8-bit depth) */

vformat->BitsPerPixel = 8;

vformat->BytesPerPixel = 1;

/* We're done! */

return(0);

}

SDL_Rect **AA_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)

{

if(format->BitsPerPixel != 8)

return NULL;

if ( flags & SDL_FULLSCREEN ) {

return SDL_modelist;

} else {

return (SDL_Rect **) -1;

}

}

/* From aavga.c

AAlib does not give us the choice of the actual resolution, thus we have to simulate additional

resolution by scaling down manually each frame

*/

static void fastscale (register char *b1, register char *b2, int x1, int x2, int y1, int y2)

{

register int ex, spx = 0, ddx, ddx1;

int ddy1, ddy, spy = 0, ey;

int x;

char *bb1 = b1;

if (!x1 || !x2 || !y1 || !y2)

return;

ddx = x1 + x1;

ddx1 = x2 + x2;

if (ddx1 < ddx)

spx = ddx / ddx1, ddx %= ddx1;

ddy = y1 + y1;

ddy1 = y2 + y2;

if (ddy1 < ddy)

spy = (ddy / ddy1) * x1, ddy %= ddy1;

ey = -ddy1;

for (; y2; y2--) {

ex = -ddx1;

for (x = x2; x; x--) {

*b2 = *b1;

b2++;

b1 += spx;

ex += ddx;

if (ex > 0) {

b1++;

ex -= ddx1;

}

}

bb1 += spy;

ey += ddy;

if (ey > 0) {

bb1 += x1;

ey -= ddy1;

}

b1 = bb1;

}

}

/* Various screen update functions available */

static void AA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);

SDL_Surface *AA_SetVideoMode(_THIS, SDL_Surface *current,

int width, int height, int bpp, Uint32 flags)

{

int mode;

if ( AA_buffer ) {

free( AA_buffer );

}

AA_buffer = malloc(width * height);

if ( ! AA_buffer ) {

SDL_SetError("Couldn't allocate buffer for requested mode");

return(NULL);

}

/* printf("Setting mode %dx%d\n", width, height); */

memset(aa_image(AA_context), 0, aa_imgwidth(AA_context) * aa_imgheight(AA_context));

memset(AA_buffer, 0, width * height);

/* Allocate the new pixel format for the screen */

if ( ! SDL_ReallocFormat(current, 8, 0, 0, 0, 0) ) {

return(NULL);

}

/* Set up the new mode framebuffer */

current->flags = SDL_FULLSCREEN;

AA_w = current->w = width;

AA_h = current->h = height;

current->pitch = current->w;

current->pixels = AA_buffer;

AA_x_ratio = ((double)aa_imgwidth(AA_context)) / ((double)width);

AA_y_ratio = ((double)aa_imgheight(AA_context)) / ((double)height);

/* Set the blit function */

this->UpdateRects = AA_DirectUpdate;

/* We're done */

return(current);

}

static void AA_ResizeHandler(aa_context *context)

{

aa_resize(context);

local_this->hidden->x_ratio = ((double)aa_imgwidth(context)) / ((double)local_this->screen->w);

local_this->hidden->y_ratio = ((double)aa_imgheight(context)) / ((double)local_this->screen->h);

fastscale (local_this->hidden->buffer, aa_image(context), local_this->hidden->w, aa_imgwidth (context), local_this->hidden->h, aa_imgheight (context));

aa_renderpalette(context, local_this->hidden->palette, local_this->hidden->rparams, 0, 0, aa_scrwidth(context), aa_scrheight(context));

aa_flush(context);

}

/* We don't actually allow hardware surfaces other than the main one */

static int AA_AllocHWSurface(_THIS, SDL_Surface *surface)

{

return(-1);

}

static void AA_FreeHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

/* We need to wait for vertical retrace on page flipped displays */

static int AA_LockHWSurface(_THIS, SDL_Surface *surface)

{

/* TODO ? */

return(0);

}

static void AA_UnlockHWSurface(_THIS, SDL_Surface *surface)

{

return;

}

/* FIXME: How is this done with AAlib? */

static int AA_FlipHWSurface(_THIS, SDL_Surface *surface)

{

SDL_mutexP(AA_mutex);

aa_flush(AA_context);

SDL_mutexV(AA_mutex);

return(0);

}

static void AA_DirectUpdate(_THIS, int numrects, SDL_Rect *rects)

{

int i;

SDL_Rect *rect;

fastscale (AA_buffer, aa_image(AA_context), AA_w, aa_imgwidth (AA_context), AA_h, aa_imgheight (AA_context));

#if 1

aa_renderpalette(AA_context, AA_palette, AA_rparams, 0, 0, aa_scrwidth(AA_context), aa_scrheight(AA_context));

#else

/* Render only the rectangles in the list */

printf("Update rects : ");

for ( i=0; i < numrects; ++i ) {

rect = &rects[i];

printf("(%d,%d-%d,%d)", rect->x, rect->y, rect->w, rect->h);

aa_renderpalette(AA_context, AA_palette, AA_rparams, rect->x * AA_x_ratio, rect->y * AA_y_ratio, rect->w * AA_x_ratio, rect->h * AA_y_ratio);

}

printf("\n");

#endif

SDL_mutexP(AA_mutex);

aa_flush(AA_context);

SDL_mutexV(AA_mutex);

return;

}

int AA_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)

{

int i;

for ( i=0; i < ncolors; i++ ) {

aa_setpalette(AA_palette, firstcolor + i,

colors[i].r>>2,

colors[i].g>>2,

colors[i].b>>2);

}

return(1);

}

/* Note: If we are terminated, this could be called in the middle of

another SDL video routine -- notably UpdateRects.

*/

void AA_VideoQuit(_THIS)

{

int i;

aa_uninitkbd(AA_context);

aa_uninitmouse(AA_context);

/* Free video mode lists */

for ( i=0; i<SDL_NUMMODES; ++i ) {

if ( SDL_modelist[i] != NULL ) {

free(SDL_modelist[i]);

SDL_modelist[i] = NULL;

}

}

aa_close(AA_context);

SDL_DestroyMutex(AA_mutex);

this->screen->pixels = NULL;

}