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gp_clipped.c

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/backends/platform/gp32/gp_clipped.c $
 * $Id: gp_clipped.c 30944 2008-02-23 22:50:18Z sev $
 *
 */

//Some global variables and macros

#define     screen_width      320
#define     screen_height     240

void gp_FastSolidBlit(void *framebuffer, int dx, const int dy, const int width, const int height, const unsigned char *src, const int trans, const int coul) {
      int xmin, ymin, xmax, ymax;
      int height2 = ( (height + 3) >> 2) << 2;

      if(dx < 0) {
            xmin = -dx;
      } else xmin = 0;
      if( (dx++ + width) > screen_width) {
            xmax = screen_width - dx;
      } else xmax = width - 1;
      if(dy < 0) {
            ymax = height + dy - 1;
      } else ymax = height - 1;
      if( (dy + height) > screen_height) {
            ymin = dy + height - screen_height;
      } else ymin = 0;
      if( (xmin > xmax) || (ymin > ymax) ) return;

      unsigned char *dst4 = framebuffer + (dx + xmax) * screen_height - height - dy + 1 + ymin;
      src += (xmax * height2 + ymin);
      ASMFastSolidBlit(src, dst4, xmax - xmin, ymax - ymin, height2, trans, coul);
}

//Copy from framebuffer to dest
void gp_SaveBitmap(void *framebuffer, int dx, const int dy, const int width, const int height, const unsigned char *dest) { //Sur l'icran
      int xmin, ymin, xmax, ymax;
      int height2 = ( (height + 3) >> 2) << 2;

      if(dx < 0) {
            xmin = -dx;
      } else xmin = 0;
      if( (dx++ + width) > screen_width) {
            xmax = screen_width - dx;
      } else xmax = width - 1;
      if(dy < 0) {
            ymax = height + dy - 1;
      } else ymax = height - 1;
      if( (dy + height) > screen_height) {
            ymin = dy + height - screen_height;
      } else ymin = 0;
      if( (xmin > xmax) || (ymin > ymax) ) return;

      unsigned char *src4 = framebuffer + (dx + xmax) * screen_height - height - dy + ymin;
      dest += (xmin * height2 + ymin + 1);
      ASMSaveBitmap(src4, dest, xmax - xmin, ymax - ymin, height2);
}

//Clears area with color #0, should not trigger clicky noise

void gp_FastClear(void *framebuffer, int dx, int dy, int width, int height) {
      int xmin, ymin, xmax, ymax;

      if(dx < 0) {
            xmin = -dx;
      } else xmin = 0;
      if( (dx++ + width) > screen_width) {
            xmax = screen_width - dx;
      } else xmax = width - 1;
      if(dy < 0) {
            ymax = height + dy - 1;
      } else ymax = height - 1;
      if( (dy + height) > screen_height) {
            ymin = dy + height - screen_height;
      } else ymin = 0;
      if( (xmin > xmax) || (ymin > ymax) ) return;

      int decaly = screen_height - height - dy;

      unsigned char *dst4 = framebuffer + (dx + xmax) * screen_height - height - dy + ymin;
      ASMFastClear(dst4, xmax - xmin, ymax - ymin);
}

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