source: abuse/trunk/src/sdlport/video-overlay.cpp @ 28 Tweet

/************************
 * video.c
 * SDL port for Abuse
 * by Anthony Kruize
 ************************/

#include <SDL.h>

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

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

extern unsigned int xres, yres;
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 *)jmalloc( width * height, "image::data" );
        }
}

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