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view src/video/SDL_blit_0.c @ 4170:092c0bc69155 SDL-1.2

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Fixed bug #618 Description From Tim Angus 2008-08-30 12:23:56 (-) [reply] As we all know SDL 1.2 doesn't handle dead keys well since one key press potentially equals two (or more) characters. For example, on many layouts, keying <backquote>,<space> results in <no character>,<backquote><space>. Since the unicode member of the SDL_keysym struct only has room for one character, only one can be returned. On Linux, the first character is returned. On Windows however, unless the exact number of characters generated by the keypress is 1, nothing is returned. The following patch addresses this inconsistency. Updated patch which includes a further fix to the handling of the numpad when numlock is on. This further fix is courtesy Amanieu d'Antras.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 13 Apr 2009 08:42:09 +0000
parents a1b03ba2fcd0
children
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 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
*/
#include "SDL_config.h"

#include "SDL_video.h"
#include "SDL_blit.h"

/* Functions to blit from bitmaps to other surfaces */

static void BlitBto1(SDL_BlitInfo *info)
{
	int c;
	int width, height;
	Uint8 *src, *map, *dst;
	int srcskip, dstskip;

	/* Set up some basic variables */
	width = info->d_width;
	height = info->d_height;
	src = info->s_pixels;
	srcskip = info->s_skip;
	dst = info->d_pixels;
	dstskip = info->d_skip;
	map = info->table;
	srcskip += width-(width+7)/8;

	if ( map ) {
		while ( height-- ) {
		        Uint8 byte = 0, bit;
	    		for ( c=0; c<width; ++c ) {
				if ( (c&7) == 0 ) {
					byte = *src++;
				}
				bit = (byte&0x80)>>7;
				if ( 1 ) {
				  *dst = map[bit];
				}
				dst++;
				byte <<= 1;
			}
			src += srcskip;
			dst += dstskip;
		}
	} else {
		while ( height-- ) {
		        Uint8 byte = 0, bit;
	    		for ( c=0; c<width; ++c ) {
				if ( (c&7) == 0 ) {
					byte = *src++;
				}
				bit = (byte&0x80)>>7;
				if ( 1 ) {
				  *dst = bit;
				}
				dst++;
				byte <<= 1;
			}
			src += srcskip;
			dst += dstskip;
		}
	}
}
static void BlitBto2(SDL_BlitInfo *info)
{
	int c;
	int width, height;
	Uint8 *src;
	Uint16 *map, *dst;
	int srcskip, dstskip;

	/* Set up some basic variables */
	width = info->d_width;
	height = info->d_height;
	src = info->s_pixels;
	srcskip = info->s_skip;
	dst = (Uint16 *)info->d_pixels;
	dstskip = info->d_skip/2;
	map = (Uint16 *)info->table;
	srcskip += width-(width+7)/8;

	while ( height-- ) {
	        Uint8 byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( 1 ) {
				*dst = map[bit];
			}
			byte <<= 1;
			dst++;
		}
		src += srcskip;
		dst += dstskip;
	}
}
static void BlitBto3(SDL_BlitInfo *info)
{
	int c, o;
	int width, height;
	Uint8 *src, *map, *dst;
	int srcskip, dstskip;

	/* Set up some basic variables */
	width = info->d_width;
	height = info->d_height;
	src = info->s_pixels;
	srcskip = info->s_skip;
	dst = info->d_pixels;
	dstskip = info->d_skip;
	map = info->table;
	srcskip += width-(width+7)/8;

	while ( height-- ) {
	        Uint8 byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( 1 ) {
				o = bit * 4;
				dst[0] = map[o++];
				dst[1] = map[o++];
				dst[2] = map[o++];
			}
			byte <<= 1;
			dst += 3;
		}
		src += srcskip;
		dst += dstskip;
	}
}
static void BlitBto4(SDL_BlitInfo *info)
{
	int width, height;
	Uint8 *src;
	Uint32 *map, *dst;
	int srcskip, dstskip;
	int c;

	/* Set up some basic variables */
	width = info->d_width;
	height = info->d_height;
	src = info->s_pixels;
	srcskip = info->s_skip;
	dst = (Uint32 *)info->d_pixels;
	dstskip = info->d_skip/4;
	map = (Uint32 *)info->table;
	srcskip += width-(width+7)/8;

	while ( height-- ) {
	        Uint8 byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( 1 ) {
				*dst = map[bit];
			}
			byte <<= 1;
			dst++;
		}
		src += srcskip;
		dst += dstskip;
	}
}

static void BlitBto1Key(SDL_BlitInfo *info)
{
        int width = info->d_width;
	int height = info->d_height;
	Uint8 *src = info->s_pixels;
	Uint8 *dst = info->d_pixels;
	int srcskip = info->s_skip;
	int dstskip = info->d_skip;
	Uint32 ckey = info->src->colorkey;
	Uint8 *palmap = info->table;
	int c;

	/* Set up some basic variables */
	srcskip += width-(width+7)/8;

	if ( palmap ) {
		while ( height-- ) {
		        Uint8  byte = 0, bit;
	    		for ( c=0; c<width; ++c ) {
				if ( (c&7) == 0 ) {
					byte = *src++;
				}
				bit = (byte&0x80)>>7;
				if ( bit != ckey ) {
				  *dst = palmap[bit];
				}
				dst++;
				byte <<= 1;
			}
			src += srcskip;
			dst += dstskip;
		}
	} else {
		while ( height-- ) {
		        Uint8  byte = 0, bit;
	    		for ( c=0; c<width; ++c ) {
				if ( (c&7) == 0 ) {
					byte = *src++;
				}
				bit = (byte&0x80)>>7;
				if ( bit != ckey ) {
				  *dst = bit;
				}
				dst++;
				byte <<= 1;
			}
			src += srcskip;
			dst += dstskip;
		}
	}
}

static void BlitBto2Key(SDL_BlitInfo *info)
{
        int width = info->d_width;
	int height = info->d_height;
	Uint8 *src = info->s_pixels;
	Uint16 *dstp = (Uint16 *)info->d_pixels;
	int srcskip = info->s_skip;
	int dstskip = info->d_skip;
	Uint32 ckey = info->src->colorkey;
	Uint8 *palmap = info->table;
	int c;

	/* Set up some basic variables */
	srcskip += width-(width+7)/8;
	dstskip /= 2;

	while ( height-- ) {
	        Uint8 byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( bit != ckey ) {
				*dstp=((Uint16 *)palmap)[bit];
			}
			byte <<= 1;
			dstp++;
		}
		src += srcskip;
		dstp += dstskip;
	}
}

static void BlitBto3Key(SDL_BlitInfo *info)
{
        int width = info->d_width;
	int height = info->d_height;
	Uint8 *src = info->s_pixels;
	Uint8 *dst = info->d_pixels;
	int srcskip = info->s_skip;
	int dstskip = info->d_skip;
	Uint32 ckey = info->src->colorkey;
	Uint8 *palmap = info->table;
	int c;

	/* Set up some basic variables */
	srcskip += width-(width+7)/8;

	while ( height-- ) {
	        Uint8  byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( bit != ckey ) {
				SDL_memcpy(dst, &palmap[bit*4], 3);
			}
			byte <<= 1;
			dst += 3;
		}
		src += srcskip;
		dst += dstskip;
	}
}

static void BlitBto4Key(SDL_BlitInfo *info)
{
        int width = info->d_width;
	int height = info->d_height;
	Uint8 *src = info->s_pixels;
	Uint32 *dstp = (Uint32 *)info->d_pixels;
	int srcskip = info->s_skip;
	int dstskip = info->d_skip;
	Uint32 ckey = info->src->colorkey;
	Uint8 *palmap = info->table;
	int c;

	/* Set up some basic variables */
	srcskip += width-(width+7)/8;
	dstskip /= 4;

	while ( height-- ) {
	        Uint8 byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( bit != ckey ) {
				*dstp=((Uint32 *)palmap)[bit];
			}
			byte <<= 1;
			dstp++;
		}
		src += srcskip;
		dstp += dstskip;
	}
}

static void BlitBtoNAlpha(SDL_BlitInfo *info)
{
        int width = info->d_width;
	int height = info->d_height;
	Uint8 *src = info->s_pixels;
	Uint8 *dst = info->d_pixels;
	int srcskip = info->s_skip;
	int dstskip = info->d_skip;
	const SDL_Color *srcpal	= info->src->palette->colors;
	SDL_PixelFormat *dstfmt = info->dst;
	int  dstbpp;
	int c;
	const int A = info->src->alpha;

	/* Set up some basic variables */
	dstbpp = dstfmt->BytesPerPixel;
	srcskip += width-(width+7)/8;

	while ( height-- ) {
	        Uint8 byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( 1 ) {
			        Uint32 pixel;
			        unsigned sR, sG, sB;
				unsigned dR, dG, dB;
				sR = srcpal[bit].r;
				sG = srcpal[bit].g;
				sB = srcpal[bit].b;
				DISEMBLE_RGB(dst, dstbpp, dstfmt,
							pixel, dR, dG, dB);
				ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
			  	ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
			}
			byte <<= 1;
			dst += dstbpp;
		}
		src += srcskip;
		dst += dstskip;
	}
}

static void BlitBtoNAlphaKey(SDL_BlitInfo *info)
{
        int width = info->d_width;
	int height = info->d_height;
	Uint8 *src = info->s_pixels;
	Uint8 *dst = info->d_pixels;
	int srcskip = info->s_skip;
	int dstskip = info->d_skip;
	SDL_PixelFormat *srcfmt = info->src;
	SDL_PixelFormat *dstfmt = info->dst;
	const SDL_Color *srcpal	= srcfmt->palette->colors;
	int dstbpp;
	int c;
	const int A = srcfmt->alpha;
	Uint32 ckey = srcfmt->colorkey;

	/* Set up some basic variables */
	dstbpp = dstfmt->BytesPerPixel;
	srcskip += width-(width+7)/8;

	while ( height-- ) {
	        Uint8  byte = 0, bit;
	    	for ( c=0; c<width; ++c ) {
			if ( (c&7) == 0 ) {
				byte = *src++;
			}
			bit = (byte&0x80)>>7;
			if ( bit != ckey ) {
			        int sR, sG, sB;
				int dR, dG, dB;
				Uint32 pixel;
				sR = srcpal[bit].r;
				sG = srcpal[bit].g;
				sB = srcpal[bit].b;
				DISEMBLE_RGB(dst, dstbpp, dstfmt,
							pixel, dR, dG, dB);
				ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB);
			  	ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB);
			}
			byte <<= 1;
			dst += dstbpp;
		}
		src += srcskip;
		dst += dstskip;
	}
}

static SDL_loblit bitmap_blit[] = {
	NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4
};

static SDL_loblit colorkey_blit[] = {
    NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key
};

SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index)
{
	int which;

	if ( surface->format->BitsPerPixel != 1 ) {
		/* We don't support sub 8-bit packed pixel modes */
		return NULL;
	}
	if ( surface->map->dst->format->BitsPerPixel < 8 ) {
		which = 0;
	} else {
		which = surface->map->dst->format->BytesPerPixel;
	}
	switch(blit_index) {
	case 0:			/* copy */
	    return bitmap_blit[which];

	case 1:			/* colorkey */
	    return colorkey_blit[which];

	case 2:			/* alpha */
	    return which >= 2 ? BlitBtoNAlpha : NULL;

	case 4:			/* alpha + colorkey */
	    return which >= 2 ? BlitBtoNAlphaKey : NULL;
	}
	return NULL;
}