source: abuse/trunk/src/sdlport/video-overlay.cpp @ 142 Tweet

/*
 *  Abuse - dark 2D side-scrolling platform game
 *  Copyright (c) 2001 Anthony Kruize <trandor@labyrinth.net.au>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software Foundation,
 *  Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 */

#include "config.h"

#include <SDL.h>

#include "filter.hpp"
#include "system.h"
#include "video.hpp"
#include "macs.hpp"
#include "image.hpp"
#include "setup.h"

SDL_Surface *window = NULL, *surface = NULL;
SDL_Overlay *overlay;
image *screen = NULL;
unsigned char current_background;

extern palette *lastl;
extern flags_struct flags;

unsigned short win_xres, win_yres;
int win_xscale, win_yscale;


// Forward declarations
void blit_surface( SDL_Rect *srcrect, SDL_Rect *dstrect );

//
// set_mode()
// Set the video mode
//
void set_mode( int mode, int argc, char **argv )
{
    const SDL_VideoInfo *vidInfo;
    int vidFlags = SDL_HWPALETTE;

    // Check for video capabilities
    vidInfo = SDL_GetVideoInfo();
    if( vidInfo->hw_available )
    {
        vidFlags |= SDL_HWSURFACE;
    }
    else
    {
        vidFlags |= SDL_SWSURFACE;
    }
    if( flags.fullscreen )
    {
        vidFlags |= SDL_FULLSCREEN;
    }
    if( flags.doublebuf )
    {
        vidFlags |= SDL_DOUBLEBUF;
    }

    // Calculate the window scale
    win_xscale = (flags.xres << 16) / xres;
    win_yscale = (flags.yres << 16) / yres;

    // Set the icon for this window.  Looks nice on taskbars etc.
    SDL_WM_SetIcon( SDL_LoadBMP("abuse.bmp"), NULL );

    // Create the window
    window = SDL_SetVideoMode( flags.xres, flags.yres, 0, vidFlags );
    if( window == NULL )
    {
        printf( "Video : Unable to set video mode : %s\n", SDL_GetError() );
        exit( 1 );
    }

    // Use overlays because they are faster for scaling
    if( flags.overlay )
    {
        overlay = SDL_CreateYUVOverlay( xres, yres, SDL_UYVY_OVERLAY, window );
    }

    // Create the screen image
    screen = new image( xres, yres, NULL, 2 );
    if( screen == NULL )
    {
        // Our screen image is no good, we have to bail.
        printf( "Video : Unable to create screen image.\n" );
        exit( 1 );
    }
    screen->clear();

    // Create our 8-bit surface
    surface = SDL_CreateRGBSurface( SDL_SWSURFACE, window->w, window->h, 8, 0xff, 0xff, 0xff, 0xff );
    if( surface == NULL )
    {
        // Our surface is no good, we have to bail.
        printf( "Video : Unable to create 8-bit surface.\n" );
        exit( 1 );
    }

    printf( "Video : Using a window of %dx%d %dbpp\n", window->w, window->h, window->format->BitsPerPixel );

    // Set the window caption
    SDL_WM_SetCaption( "Abuse-SDL", "Abuse-SDL" );

    // Grab and hide the mouse cursor
    SDL_ShowCursor( 0 );
    if( flags.grabmouse )
    {
        SDL_WM_GrabInput( SDL_GRAB_ON );
    }

    update_dirty( screen );
}

//
// close_graphics()
// Shutdown the video mode
//
void close_graphics()
{
    if( lastl )
    {
        delete lastl;
    }
    lastl = NULL;
    // Free our 8-bit surface
    if( surface )
    {
        SDL_FreeSurface( surface );
    }
    // Free our overlay
    if( overlay )
    {
        SDL_FreeYUVOverlay( overlay );
    }
    delete screen;
}

// put_part_image()
// Draw only dirty parts of the image
//
void put_part_image( image *im, int x, int y, int x1, int y1, int x2, int y2 )
{
    int xs, xe, ys, ye;
    SDL_Rect srcrect, dstrect;
    int ii, jj;
    int srcx, srcy, xstep, ystep;
    Uint8 *dpixel;
    Uint16 dinset;
    int dest_addr, line_width;

    if( y > (int)yres || x > (int)xres )
    {
        return;
    }
    CHECK( x1 >= 0 && x2 >= x1 && y1 >= 0 && y2 >= y1 );

    // Adjust if we are trying to draw off the screen
    if( x < 0 )
    {
        x1 += -x;
        x = 0;
    }
    srcrect.x = x1;
    if( x + ( x2 - x1 ) >= xres )
    {
        xe = xres - x + x1 - 1;
    }
    else
    {
        xe = x2;
    }
    if( y < 0 )
    {
        y1 += -y;
        y = 0;
    }
    srcrect.y = y1;
    if( y + ( y2 - y1 ) >= yres )
    {
        ye = yres - y + y1 - 1;
    }
    else
    {
        ye = y2;
    }
    if( srcrect.x >= xe || srcrect.y >= ye )
        return;

    if( SDL_LockYUVOverlay( overlay ) == -1 )
    {
        // we failed to lock
        printf( "ERROR - Failed to lock overlay.\n" );
        return;
    }

    // This is our old copying code, left here for now just in case I still nee it
    // Set up our blit rectangle
    dstrect.w = xe - xs;
    dstrect.h = ye - ys;
    dstrect.x = x;
    dstrect.y = y;
    line_width = xe - xs + 1;

    if( SDL_LockYUVOverlay( overlay ) == -1 )
    {
        // we failed to lock
        printf( "ERROR - Failed to lock overlay.\n" );
        return;
    }

    // fill buffer with current surface
/*    for( int ii = ys; ii <= ye; ii++ )
    {
//        dest_addr = ( (dstrect.y + ii - ys) * screen_width ) + dstrect.x;
        dest_addr = ( (dstrect.y + ii - ys) * overlay->pitches[0] ) + dstrect.x;
//        memcpy( &((char *)(surface->pixels))[dest_addr], im->scan_line( ii ) + xs, line_width );
//        memcpy( &((char *)(overlay->pixels))[dest_addr], im->scan_line( ii ) + xs, line_width );
    }*/
    char blah = 0xff;
    for( int ii = 0; ii < overlay->pitches[0] * 2; ii++ )
    memcpy( &((char *)(overlay->pixels))[ii], ((char *)(&blah)), 1 );

    SDL_UnlockYUVOverlay( overlay );

/*    // Scale the image onto the surface
    srcrect.w = xe - srcrect.x;
    srcrect.h = ye - srcrect.y;
    dstrect.x = ((x * win_xscale) >> 16);
    dstrect.y = ((y * win_yscale) >> 16);
    dstrect.w = ((srcrect.w * win_xscale) >> 16);
    dstrect.h = ((srcrect.h * win_yscale) >> 16);

    xstep = (srcrect.w << 16) / dstrect.w;
    ystep = (srcrect.h << 16) / dstrect.h;

    srcy = ((srcrect.y) << 16);
    dinset = ((surface->w - dstrect.w)) * surface->format->BytesPerPixel;

    // Lock the surface if necessary
    if( SDL_MUSTLOCK( surface ) )
    {
        SDL_LockSurface( surface );
    }
    dpixel = (Uint8 *)surface->pixels;
    dpixel += (dstrect.x + ((dstrect.y) * surface->w)) * surface->format->BytesPerPixel;

    for( ii = 0; ii < dstrect.h; ii++ )
    {
        srcx = (srcrect.x << 16);
        for( jj = 0; jj < dstrect.w; jj++ )
        {
            memcpy( dpixel, im->scan_line( (srcy >> 16) ) + ((srcx >> 16) * surface->format->BytesPerPixel), surface->format->BytesPerPixel );
            dpixel += surface->format->BytesPerPixel;
            srcx += xstep;
        }
        dpixel += dinset;
        srcy += ystep;
    }

    // Now unlock the surface if we locked it.
    if( SDL_MUSTLOCK( surface ) )
    {
        SDL_UnlockSurface( surface );
    } */

    // Now blit the surface
    blit_surface( &dstrect, &dstrect );
}

//
// put_image()
// Draw the entire image
//
void put_image( image * im, int x, int y )
{
    put_part_image( im, x, y, 0, 0, im->width() - 1, im->height() - 1 );
}

//
// update_dirty_window()
// Update the dirty parts of the window
//
void update_dirty_window( image *im, int xoff, int yoff )
{
    int count;
    dirty_rect *dr, *q;
    CHECK( im->special ); // make sure the image has the ability to contain dirty areas
    if( im->special->keep_dirt == 0 )
    {
        put_image( im, xoff, yoff );
    }
    else
    {
        count = im->special->dirties.number_nodes();
        if( !count )
            return;  // if nothing to update, return
        dr = (dirty_rect *)( im->special->dirties.first() );
        while( count > 0 )
        {
            put_part_image( im, xoff + dr->dx1, yoff + dr->dy1, dr->dx1, dr->dy1, dr->dx2 + 1, dr->dy2 + 1 );
            q = dr;
            dr = (dirty_rect *)( dr->next() );
            im->special->dirties.unlink( ( linked_node *)q );
            delete q;
            count--;
        }
    }
}

//
// update_dirty()
// Update the dirty parts of the image
//
void update_dirty( image *im, int xoff, int yoff )
{
    update_dirty_window( im, xoff, yoff );
}

//
// make_page()
//
void image::make_page( short width, short height, unsigned char *page_buffer )
{
    if( page_buffer )
    {
        data = page_buffer;
    }
    else
    {
        data = (unsigned char *)malloc(width * height);
    }
}

//
// delete_page()
//
void image::delete_page()
{
    if( !special || !special->static_mem )
    {
        free( data );
    }
}

//
// load()
// Set the palette
//
void palette::load()
{
    if( lastl )
    {
        delete lastl;
    }
    lastl = copy();

    // Force to only 256 colours.
    // Shouldn't be needed, but best to be safe.
    if( ncolors > 256 )
    {
        ncolors = 256;
    }

    SDL_Color colors[ncolors];
    for( int ii = 0; ii < ncolors; ii++ )
    {
        colors[ii].r = red(ii);
        colors[ii].g = green(ii);
        colors[ii].b = blue(ii);
    }
    SDL_SetColors( surface, colors, 0, ncolors );
    if( window->format->BitsPerPixel == 8 )
    {
        SDL_SetColors( window, colors, 0, ncolors );
    }

    // Now redraw the surface
    blit_surface( NULL, NULL );
}

//
// load_nice()
//
void palette::load_nice()
{
    load();
}

// ---- support functions ----

void blit_surface( SDL_Rect *srcrect, SDL_Rect *dstrect)
{
    SDL_Surface *cvtsfc = SDL_ConvertSurface( surface, window->format, SDL_HWSURFACE );
    if( cvtsfc == NULL )
    {
        // Our convert surface died...bad :(
        return;
    }

    if( flags.overlay )
    {
        SDL_Rect or;
        or.x = 0;
        or.y = 0;
        or.w = window->w;
        or.h = window->h;
        SDL_DisplayYUVOverlay( overlay, &or );
    }

//    SDL_BlitSurface( cvtsfc, srcrect, window, dstrect );
    SDL_FreeSurface( cvtsfc );

    // Flip the backbuffer to the front
    if( flags.doublebuf )
    {
        SDL_Flip( window );
    }
    else
    {
        if( dstrect == NULL )
        {
            SDL_UpdateRect( window, 0, 0, 0, 0 );
        }
        else
        {
            SDL_UpdateRect( window, dstrect->x, dstrect->y, dstrect->w, dstrect->h );
        }
    }
}