core/GP_Context.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) 2009-2010 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2010 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include "GP.h"
  27
  28 inline GP_PixelType GP_GetContextPixelType(const GP_Context *context)
  29 {
  30         return context->pixel_type;
  31 }
  32
  33 GP_Context *GP_ContextAlloc(uint32_t w, uint32_t h, GP_PixelType type)
  34 {
  35         GP_Context *context = malloc(sizeof(GP_Context));
  36         uint32_t bpp = GP_PixelSize(type);
  37         uint32_t bpr = (bpp * w) / 8 + !!((bpp * w) % 8);
  38         void *pixels;
  39
  40         pixels = malloc(bpr * h);
  41
  42         if (pixels == NULL || context == NULL) {
  43                 free(pixels);
  44                 free(context);
  45                 return NULL;
  46         }
  47
  48         context->pixels         = pixels;
  49         context->bpp            = bpp;
  50         context->bytes_per_row  = bpr;
  51
  52         context->w = w;
  53         context->h = h;
  54
  55         context->pixel_type = type;
  56
  57         /* rotation and mirroring */
  58         context->axes_swap = 0;
  59         context->y_swap    = 0;
  60         context->x_swap    = 0;
  61
  62         /* clipping */
  63         context->clip_w_min = 0;
  64         context->clip_w_max = w - 1;
  65         context->clip_h_min = 0;
  66         context->clip_h_max = h - 1;
  67
  68         return context;
  69 }
  70
  71 void GP_ContextFree(GP_Context *context)
  72 {
  73         free(context->pixels);
  74         free(context);
  75 }
  76
  77 GP_RetCode GP_ContextDump(GP_Context *context, const char *path)
  78 {
  79         FILE *f = fopen(path, "w");
  80         uint32_t x, y;
  81
  82         if (f == NULL)
  83                 return GP_EBADFILE;
  84
  85         for (y = 0; y < context->h; y++) {
  86                 for (x = 0; x < context->bytes_per_row; x++)
  87                         fprintf(f, "0x%02x ", ((uint8_t *)context->pixels)[y * context->bytes_per_row + x]);
  88                 fprintf(f, "\n");
  89         }
  90
  91         fclose(f);
  92         return GP_ESUCCESS;
  93 }