e964eb17a0
+ "debug.h": Defines whether debugging printf() calls should be enabled. + "dirwalk.c/h": Callback functions for recursive directory traversal. + "fonts.c/h": Font loading/grouping/discarding variables and functions. + "get_fname.c/h": Functions for constructing preferred file paths.
248 lines
7.7 KiB
C
248 lines
7.7 KiB
C
/*
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pixels.c
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For Tux Paint
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Pixel read/write functions
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Copyright (c) 2002-2006 by Bill Kendrick and others
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bill@newbreedsoftware.com
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http://www.newbreedsoftware.com/tuxpaint/
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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(See COPYING.txt)
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June 14, 2002 - February 17, 2006
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$Id$
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*/
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#include "pixels.h"
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#include "compiler.h"
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#include "debug.h"
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/* Draw a single pixel into the surface: */
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void putpixel8(SDL_Surface * surface, int x, int y, Uint32 pixel)
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{
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Uint8 * p;
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/* Assuming the X/Y values are within the bounds of this surface... */
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if (likely( likely((unsigned)x<(unsigned)surface->w) && likely((unsigned)y<(unsigned)surface->h) ))
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{
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// Set a pointer to the exact location in memory of the pixel
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start: beginning of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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x); /* Go in X pixels */
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/* Set the (correctly-sized) piece of data in the surface's RAM
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* to the pixel value sent in: */
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*p = pixel;
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}
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}
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/* Draw a single pixel into the surface: */
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void putpixel16(SDL_Surface * surface, int x, int y, Uint32 pixel)
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{
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Uint8 * p;
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/* Assuming the X/Y values are within the bounds of this surface... */
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if (likely( likely((unsigned)x<(unsigned)surface->w) && likely((unsigned)y<(unsigned)surface->h) ))
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{
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// Set a pointer to the exact location in memory of the pixel
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start: beginning of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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(x * 2)); /* Go in X pixels */
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/* Set the (correctly-sized) piece of data in the surface's RAM
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* to the pixel value sent in: */
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*(Uint16 *)p = pixel;
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}
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}
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/* Draw a single pixel into the surface: */
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void putpixel24(SDL_Surface * surface, int x, int y, Uint32 pixel)
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{
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Uint8 * p;
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/* Assuming the X/Y values are within the bounds of this surface... */
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if (likely( likely((unsigned)x<(unsigned)surface->w) && likely((unsigned)y<(unsigned)surface->h) ))
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{
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// Set a pointer to the exact location in memory of the pixel
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start: beginning of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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(x * 3)); /* Go in X pixels */
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/* Set the (correctly-sized) piece of data in the surface's RAM
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* to the pixel value sent in: */
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if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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{
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p[0] = (pixel >> 16) & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = pixel & 0xff;
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}
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else
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{
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p[0] = pixel & 0xff;
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p[1] = (pixel >> 8) & 0xff;
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p[2] = (pixel >> 16) & 0xff;
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}
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}
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}
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/* Draw a single pixel into the surface: */
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void putpixel32(SDL_Surface * surface, int x, int y, Uint32 pixel)
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{
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Uint8 * p;
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/* Assuming the X/Y values are within the bounds of this surface... */
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if (likely( likely((unsigned)x<(unsigned)surface->w) && likely((unsigned)y<(unsigned)surface->h) ))
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{
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// Set a pointer to the exact location in memory of the pixel
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start: beginning of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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(x * 4)); /* Go in X pixels */
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/* Set the (correctly-sized) piece of data in the surface's RAM
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* to the pixel value sent in: */
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*(Uint32 *)p = pixel; // 32-bit display
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}
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}
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/* Get a pixel: */
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Uint32 getpixel8(SDL_Surface * surface, int x, int y)
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{
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Uint8 * p;
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/* get the X/Y values within the bounds of this surface */
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if (unlikely( (unsigned)x > (unsigned)surface->w - 1u ))
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x = (x<0) ? 0 : surface->w - 1;
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if (unlikely( (unsigned)y > (unsigned)surface->h - 1u ))
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y = (y<0) ? 0 : surface->h - 1;
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/* Set a pointer to the exact location in memory of the pixel
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in question: */
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start at top of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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x); /* Go in X pixels */
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/* Return the correctly-sized piece of data containing the
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* pixel's value (an 8-bit palette value, or a 16-, 24- or 32-bit
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* RGB value) */
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return(*p);
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}
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/* Get a pixel: */
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Uint32 getpixel16(SDL_Surface * surface, int x, int y)
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{
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Uint8 * p;
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/* get the X/Y values within the bounds of this surface */
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if (unlikely( (unsigned)x > (unsigned)surface->w - 1u ))
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x = (x<0) ? 0 : surface->w - 1;
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if (unlikely( (unsigned)y > (unsigned)surface->h - 1u ))
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y = (y<0) ? 0 : surface->h - 1;
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/* Set a pointer to the exact location in memory of the pixel
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in question: */
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start at top of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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(x * 2)); /* Go in X pixels */
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/* Return the correctly-sized piece of data containing the
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* pixel's value (an 8-bit palette value, or a 16-, 24- or 32-bit
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* RGB value) */
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return(*(Uint16 *)p);
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}
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/* Get a pixel: */
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Uint32 getpixel24(SDL_Surface * surface, int x, int y)
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{
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Uint8 * p;
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Uint32 pixel;
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/* get the X/Y values within the bounds of this surface */
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if (unlikely( (unsigned)x > (unsigned)surface->w - 1u ))
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x = (x<0) ? 0 : surface->w - 1;
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if (unlikely( (unsigned)y > (unsigned)surface->h - 1u ))
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y = (y<0) ? 0 : surface->h - 1;
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/* Set a pointer to the exact location in memory of the pixel
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in question: */
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start at top of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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(x * 3)); /* Go in X pixels */
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/* Return the correctly-sized piece of data containing the
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* pixel's value (an 8-bit palette value, or a 16-, 24- or 32-bit
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* RGB value) */
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/* Depending on the byte-order, it could be stored RGB or BGR! */
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if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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pixel = p[0] << 16 | p[1] << 8 | p[2];
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else
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pixel = p[0] | p[1] << 8 | p[2] << 16;
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return pixel;
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}
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/* Get a pixel: */
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Uint32 getpixel32(SDL_Surface * surface, int x, int y)
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{
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Uint8 * p;
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/* get the X/Y values within the bounds of this surface */
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if (unlikely( (unsigned)x > (unsigned)surface->w - 1u ))
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x = (x<0) ? 0 : surface->w - 1;
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if (unlikely( (unsigned)y > (unsigned)surface->h - 1u ))
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y = (y<0) ? 0 : surface->h - 1;
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/* Set a pointer to the exact location in memory of the pixel
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in question: */
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p = (Uint8 *) (((Uint8 *)surface->pixels) + /* Start at top of RAM */
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(y * surface->pitch) + /* Go down Y lines */
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(x * 4)); /* Go in X pixels */
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/* Return the correctly-sized piece of data containing the
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* pixel's value (an 8-bit palette value, or a 16-, 24- or 32-bit
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* RGB value) */
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return *(Uint32 *)p; // 32-bit display
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}
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void (*putpixels[])(SDL_Surface *, int, int, Uint32) = {
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putpixel8, putpixel8, putpixel16, putpixel24, putpixel32 };
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Uint32 (*getpixels[])(SDL_Surface *, int, int) = {
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getpixel8, getpixel8, getpixel16, getpixel24, getpixel32 };
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