libs/core/GP_Blit.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim is free software; you can redistribute it and/or                  *
   5  * modify it under the terms of the GNU Lesser General Public                *
   6  * License as published by the Free Software Foundation; either              *
   7  * version 2.1 of the License, or (at your option) any later version.        *
   8  *                                                                           *
   9  * Gfxprim is distributed in the hope that it will be useful,                *
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU         *
  12  * Lesser General Public License for more details.                           *
  13  *                                                                           *
  14  * You should have received a copy of the GNU Lesser General Public          *
  15  * License along with gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2011      Tomas Gavenciak <gavento@ucw.cz>                  *
  20  * Copyright (C) 2011-2013 Cyril Hrubis    <metan@ucw.cz>                    *
  21  *                                                                           *
  22  *****************************************************************************/
  23
  24 #include "core/GP_Pixel.h"
  25 #include "core/GP_GetPutPixel.h"
  26 #include "core/GP_Pixmap.h"
  27 #include "core/GP_Convert.h"
  28 #include "core/GP_Debug.h"
  29 #include "core/GP_Blit.h"
  30
  31 /* Generated functions */
  32 void GP_BlitXYXY_Raw_Fast(const GP_Pixmap *src,
  33                           GP_Coord x0, GP_Coord y0, GP_Coord x1, GP_Coord y1,
  34                           GP_Pixmap *dst, GP_Coord x2, GP_Coord y2);
  35
  36 void GP_BlitXYXY_Fast(const GP_Pixmap *src,
  37                       GP_Coord x0, GP_Coord y0, GP_Coord x1, GP_Coord y1,
  38                       GP_Pixmap *dst, GP_Coord x2, GP_Coord y2);
  39
  40 void GP_BlitXYXY(const GP_Pixmap *src,
  41                  GP_Coord x0, GP_Coord y0, GP_Coord x1, GP_Coord y1,
  42                  GP_Pixmap *dst, GP_Coord x2, GP_Coord y2)
  43 {
  44         /* Normalize source rectangle */
  45         if (x1 < x0)
  46                 GP_SWAP(x0, x1);
  47
  48         if (y1 < y0)
  49                 GP_SWAP(y0, y1);
  50
  51         /* All coordinates are inside of src the pixmap */
  52         GP_CHECK(x0 < (GP_Coord)GP_PixmapW(src));
  53         GP_CHECK(y0 < (GP_Coord)GP_PixmapH(src));
  54         GP_CHECK(x1 < (GP_Coord)GP_PixmapW(src));
  55         GP_CHECK(y1 < (GP_Coord)GP_PixmapH(src));
  56
  57         /* Destination is big enough */
  58         GP_CHECK(x2 + (x1 - x0) < (GP_Coord)GP_PixmapW(dst));
  59         GP_CHECK(y2 + (y1 - y0) < (GP_Coord)GP_PixmapH(dst));
  60
  61         GP_BlitXYXY_Fast(src, x0, y0, x1, y1, dst, x2, y2);
  62 }
  63
  64 void GP_BlitXYXY_Clipped(const GP_Pixmap *src,
  65                          GP_Coord x0, GP_Coord y0, GP_Coord x1, GP_Coord y1,
  66                          GP_Pixmap *dst, GP_Coord x2, GP_Coord y2)
  67 {
  68         /* Normalize source rectangle */
  69         if (x1 < x0)
  70                 GP_SWAP(x0, x1);
  71
  72         if (y1 < y0)
  73                 GP_SWAP(y0, y1);
  74
  75         /*
  76          * Handle all cases where at least one of dest coordinates are out of
  77          * the dest in positive direction -> src is out of dst completly.
  78          */
  79         if (x2 >= (GP_Coord)GP_PixmapW(dst) ||
  80             y2 >= (GP_Coord)GP_PixmapH(dst))
  81                 return;
  82
  83         /*
  84          * The coordinates in dest are negative.
  85          *
  86          * We need to clip the source upper left corner accordingly.
  87          *
  88          * Notice that x2 and y2 are inside the dst rectangle now.
  89          * (>= 0 and < w, < h)
  90          */
  91         if (x2 < 0) {
  92                 x0 -= x2;
  93                 x2 = 0;
  94         }
  95
  96         if (y2 < 0) {
  97                 y0 -= y2;
  98                 y2 = 0;
  99         }
 100
 101         /* Make sure souce coordinates are inside of the src */
 102         x0 = GP_MAX(x0, 0);
 103         y0 = GP_MAX(y0, 0);
 104         x1 = GP_MIN(x1, (GP_Coord)GP_PixmapW(src) - 1);
 105         y1 = GP_MIN(y1, (GP_Coord)GP_PixmapH(src) - 1);
 106
 107         /* And source rectangle fits inside of the destination */
 108         GP_Coord src_w = x1 - x0 + 1;
 109         GP_Coord src_h = y1 - y0 + 1;
 110
 111         GP_Coord dst_w = GP_PixmapW(dst) - x2;
 112         GP_Coord dst_h = GP_PixmapH(dst) - y2;
 113
 114         GP_DEBUG(2, "Blitting %ix%i, available %ix%i",
 115                  src_w, src_h, dst_w, dst_h);
 116
 117         if (src_w > dst_w)
 118                 x1 -= src_w - dst_w;
 119
 120         if (src_h > dst_h)
 121                 y1 -= src_h - dst_h;
 122
 123         GP_DEBUG(2, "Blitting %ix%i->%ix%i in %ux%u to %ix%i in %ux%u",
 124                  x0, y0, x1, y1, GP_PixmapW(src), GP_PixmapH(src),
 125                  x2, y2, GP_PixmapW(dst), GP_PixmapH(dst));
 126
 127         GP_BlitXYXY_Fast(src, x0, y0, x1, y1, dst, x2, y2);
 128 }
 129
 130 void GP_BlitXYWH(const GP_Pixmap *src,
 131                  GP_Coord x0, GP_Coord y0, GP_Size w0, GP_Size h0,
 132                  GP_Pixmap *dst, GP_Coord x1, GP_Coord y1)
 133 {
 134         if (w0 == 0 || h0 == 0)
 135                 return;
 136
 137         GP_BlitXYXY(src, x0, y0, x0 + w0 - 1, y0 + h0 - 1, dst, x1, y1);
 138 }
 139
 140 void GP_BlitXYWH_Clipped(const GP_Pixmap *src,
 141                          GP_Coord x0, GP_Coord y0, GP_Size w0, GP_Size h0,
 142                          GP_Pixmap *dst, GP_Coord x1, GP_Coord y1)
 143 {
 144         if (w0 == 0 || h0 == 0)
 145                 return;
 146
 147         GP_BlitXYXY_Clipped(src, x0, y0, x0 + w0 - 1, y0 + h0 - 1, dst, x1, y1);
 148 }
 149
 150 void GP_BlitXYXY_Raw(const GP_Pixmap *src,
 151                      GP_Coord x0, GP_Coord y0, GP_Coord x1, GP_Coord y1,
 152                      GP_Pixmap *dst, GP_Coord x2, GP_Coord y2)
 153 {
 154         /* Normalize source rectangle */
 155         if (x1 < x0)
 156                 GP_SWAP(x0, x1);
 157
 158         if (y1 < y0)
 159                 GP_SWAP(y0, y1);
 160
 161         /* All coordinates are inside of src the pixmap */
 162         GP_CHECK(x0 < (GP_Coord)src->w);
 163         GP_CHECK(y0 < (GP_Coord)src->h);
 164         GP_CHECK(x1 < (GP_Coord)src->w);
 165         GP_CHECK(y1 < (GP_Coord)src->h);
 166
 167         /* Destination is big enough */
 168         GP_CHECK(x2 + (x1 - x0) < (GP_Coord)dst->w);
 169         GP_CHECK(y2 + (y1 - y0) < (GP_Coord)dst->h);
 170
 171         GP_BlitXYXY_Raw_Fast(src, x0, y0, x1, y1, dst, x2, y2);
 172 }
 173
 174 void GP_BlitXYWH_Raw(const GP_Pixmap *src,
 175                      GP_Coord x0, GP_Coord y0, GP_Size w0, GP_Size h0,
 176                      GP_Pixmap *dst, GP_Coord x2, GP_Coord y2)
 177 {
 178         if (w0 == 0 || h0 == 0)
 179                 return;
 180
 181         GP_BlitXYXY_Raw(src, x0, y0, x0 + w0 - 1, y0 + h0 - 1, dst, x2, y2);
 182 }