graphics/surface.cpp

   1 /* ScummVM - Graphic Adventure Engine
   2  *
   3  * ScummVM is the legal property of its developers, whose names
   4  * are too numerous to list here. Please refer to the COPYRIGHT
   5  * file distributed with this source distribution.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  *
  21  * $URL$
  22  * $Id$
  23  */
  24
  25 #include "common/algorithm.h"
  26 #include "common/util.h"
  27 #include "graphics/primitives.h"
  28 #include "graphics/surface.h"
  29
  30 namespace Graphics {
  31
  32 template<typename T>
  33 static void plotPoint(int x, int y, int color, void *data) {
  34         Surface *s = (Surface *)data;
  35         if (x >= 0 && x < s->w && y >= 0 && y < s->h) {
  36                 T *ptr = (T *)s->getBasePtr(x, y);
  37                 *ptr = (T)color;
  38         }
  39 }
  40
  41 void Surface::drawLine(int x0, int y0, int x1, int y1, uint32 color) {
  42         if (bytesPerPixel == 1)
  43                 Graphics::drawLine(x0, y0, x1, y1, color, plotPoint<byte>, this);
  44         else if (bytesPerPixel == 2)
  45                 Graphics::drawLine(x0, y0, x1, y1, color, plotPoint<uint16>, this);
  46         else
  47                 error("Surface::drawLine: bytesPerPixel must be 1 or 2");
  48 }
  49
  50 void Surface::create(uint16 width, uint16 height, uint8 bytesPP) {
  51         free();
  52
  53         w = width;
  54         h = height;
  55         bytesPerPixel = bytesPP;
  56         pitch = w * bytesPP;
  57
  58         pixels = calloc(width * height, bytesPP);
  59         assert(pixels);
  60 }
  61
  62 void Surface::free() {
  63         ::free(pixels);
  64         pixels = 0;
  65         w = h = pitch = 0;
  66         bytesPerPixel = 0;
  67 }
  68
  69 void Surface::copyFrom(const Surface &surf) {
  70         create(surf.w, surf.h, surf.bytesPerPixel);
  71         memcpy(pixels, surf.pixels, h * pitch);
  72 }
  73
  74 void Surface::hLine(int x, int y, int x2, uint32 color) {
  75         // Clipping
  76         if (y < 0 || y >= h)
  77                 return;
  78
  79         if (x2 < x)
  80                 SWAP(x2, x);
  81
  82         if (x < 0)
  83                 x = 0;
  84         if (x2 >= w)
  85                 x2 = w - 1;
  86
  87         if (x2 < x)
  88                 return;
  89
  90         if (bytesPerPixel == 1) {
  91                 byte *ptr = (byte *)getBasePtr(x, y);
  92                 memset(ptr, (byte)color, x2-x+1);
  93         } else if (bytesPerPixel == 2) {
  94                 uint16 *ptr = (uint16 *)getBasePtr(x, y);
  95                 Common::set_to(ptr, ptr + (x2-x+1), (uint16)color);
  96         } else {
  97                 error("Surface::hLine: bytesPerPixel must be 1 or 2");
  98         }
  99 }
 100
 101 void Surface::vLine(int x, int y, int y2, uint32 color) {
 102         // Clipping
 103         if (x < 0 || x >= w)
 104                 return;
 105
 106         if (y2 < y)
 107                 SWAP(y2, y);
 108
 109         if (y < 0)
 110                 y = 0;
 111         if (y2 >= h)
 112                 y2 = h - 1;
 113
 114         if (bytesPerPixel == 1) {
 115                 byte *ptr = (byte *)getBasePtr(x, y);
 116                 while (y++ <= y2) {
 117                         *ptr = (byte)color;
 118                         ptr += pitch;
 119                 }
 120         } else if (bytesPerPixel == 2) {
 121                 uint16 *ptr = (uint16 *)getBasePtr(x, y);
 122                 while (y++ <= y2) {
 123                         *ptr = (uint16)color;
 124                         ptr += pitch/2;
 125                 }
 126         } else {
 127                 error("Surface::vLine: bytesPerPixel must be 1 or 2");
 128         }
 129 }
 130
 131 void Surface::fillRect(Common::Rect r, uint32 color) {
 132         r.clip(w, h);
 133
 134         if (!r.isValidRect())
 135                 return;
 136
 137         int width = r.width();
 138         int height = r.height();
 139 //      int i;
 140
 141         if (bytesPerPixel == 1) {
 142                 byte *ptr = (byte *)getBasePtr(r.left, r.top);
 143                 while (height--) {
 144                         memset(ptr, (byte)color, width);
 145                         ptr += pitch;
 146                 }
 147         } else if (bytesPerPixel == 2) {
 148                 uint16 *ptr = (uint16 *)getBasePtr(r.left, r.top);
 149                 while (height--) {
 150                         Common::set_to(ptr, ptr + width, (uint16)color);
 151                         ptr += pitch/2;
 152                 }
 153         } else {
 154                 error("Surface::fillRect: bytesPerPixel must be 1 or 2");
 155         }
 156 }
 157
 158 void Surface::frameRect(const Common::Rect &r, uint32 color) {
 159         hLine(r.left, r.top, r.right-1, color);
 160         hLine(r.left, r.bottom-1, r.right-1, color);
 161         vLine(r.left, r.top, r.bottom-1, color);
 162         vLine(r.right-1, r.top, r.bottom-1, color);
 163 }
 164
 165 // FIXME: LordHoto asks why is this in Surface, since this
 166 // just supports 8bpp surfaces. Looks like someone wants
 167 // to subclass Surface to add this or it should be extended
 168 // to support 16bpp (or marked as just working for 8bpp
 169 // surfaces).
 170 void Surface::move(int dx, int dy, int height) {
 171         // This function currently just works with 8bpp surfaces
 172         assert(bytesPerPixel == 1);
 173
 174         // Short circuit check - do we have to do anything anyway?
 175         if ((dx == 0 && dy == 0) || height <= 0)
 176                 return;
 177
 178         byte *src, *dst;
 179         int x, y;
 180
 181         // vertical movement
 182         if (dy > 0) {
 183                 // move down - copy from bottom to top
 184                 dst = (byte *)pixels + (height - 1) * w;
 185                 src = dst - dy * w;
 186                 for (y = dy; y < height; y++) {
 187                         memcpy(dst, src, w);
 188                         src -= w;
 189                         dst -= w;
 190                 }
 191         } else if (dy < 0) {
 192                 // move up - copy from top to bottom
 193                 dst = (byte *)pixels;
 194                 src = dst - dy * w;
 195                 for (y = -dy; y < height; y++) {
 196                         memcpy(dst, src, w);
 197                         src += w;
 198                         dst += w;
 199                 }
 200         }
 201
 202         // horizontal movement
 203         if (dx > 0) {
 204                 // move right - copy from right to left
 205                 dst = (byte *)pixels + (w - 1);
 206                 src = dst - dx;
 207                 for (y = 0; y < height; y++) {
 208                         for (x = dx; x < w; x++) {
 209                                 *dst-- = *src--;
 210                         }
 211                         src += w + (w - dx);
 212                         dst += w + (w - dx);
 213                 }
 214         } else if (dx < 0)  {
 215                 // move left - copy from left to right
 216                 dst = (byte *)pixels;
 217                 src = dst - dx;
 218                 for (y = 0; y < height; y++) {
 219                         for (x = -dx; x < w; x++) {
 220                                 *dst++ = *src++;
 221                         }
 222                         src += w - (w + dx);
 223                         dst += w - (w + dx);
 224                 }
 225         }
 226 }
 227
 228 } // End of namespace Graphics