libs/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) 2009-2011 Jiri "BlueBear" Dluhos                            *
  20  *                         <jiri.bluebear.dluhos@gmail.com>                  *
  21  *                                                                           *
  22  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  23  *                                                                           *
  24  *****************************************************************************/
  25
  26 #include <errno.h>
  27 #include <string.h>
  28
  29 #include "GP_Debug.h"
  30 #include "GP_Transform.h"
  31 #include "GP_Pixel.h"
  32 #include "GP_GetPutPixel.h"
  33 #include "GP_Gamma.h"
  34 #include "GP_Context.h"
  35 #include "GP_Blit.h"
  36
  37 static uint32_t get_bpr(uint32_t bpp, uint32_t w)
  38 {
  39         return (bpp * w) / 8 + !!((bpp * w) % 8);
  40 }
  41
  42 GP_Context *GP_ContextAlloc(GP_Size w, GP_Size h, GP_PixelType type)
  43 {
  44         GP_CHECK_VALID_PIXELTYPE(type);
  45         GP_Context *context;
  46         uint32_t bpp = GP_PixelSize(type);
  47         uint32_t bpr = get_bpr(bpp, w);
  48         void *pixels;
  49
  50         pixels = malloc(bpr * h);
  51         context = malloc(sizeof(GP_Context));
  52
  53         if (pixels == NULL || context == NULL) {
  54                 free(pixels);
  55                 free(context);
  56                 GP_WARN("Malloc failed :(");
  57                 errno = ENOMEM;
  58                 return NULL;
  59         }
  60
  61         context->pixels         = pixels;
  62         context->bpp            = bpp;
  63         context->bytes_per_row  = bpr;
  64         context->offset         = 0;
  65
  66         context->w = w;
  67         context->h = h;
  68
  69         context->gamma = NULL;
  70
  71         context->pixel_type = type;
  72         #warning Hmm, bit endianity... Why is not this settled by different pixel types?
  73         context->bit_endian = 0;
  74
  75         /* rotation and mirroring */
  76         GP_ContextSetRotation(context, 0, 0, 0);
  77
  78         context->free_pixels = 1;
  79
  80         return context;
  81 }
  82
  83 void GP_ContextFree(GP_Context *context)
  84 {
  85         GP_DEBUG(1, "Freeing context (%p)", context);
  86
  87         if (context == NULL)
  88                 return;
  89
  90         if (context->free_pixels)
  91                 free(context->pixels);
  92
  93         if (context->gamma)
  94                 GP_GammaRelease(context->gamma);
  95
  96         free(context);
  97 }
  98
  99 GP_Context *GP_ContextInit(GP_Context *context, GP_Size w, GP_Size h,
 100                            GP_PixelType type, void *pixels)
 101 {
 102         uint32_t bpp = GP_PixelSize(type);
 103         uint32_t bpr = get_bpr(bpp, w);
 104
 105         context->pixels        = pixels;
 106         context->bpp           = bpp;
 107         context->bytes_per_row = bpr;
 108         context->offset        = 0;
 109
 110         context->w = w;
 111         context->h = h;
 112
 113         context->pixel_type = type;
 114         context->bit_endian = 0;
 115
 116         context->gamma = NULL;
 117
 118         /* rotation and mirroring */
 119         GP_ContextSetRotation(context, 0, 0, 0);
 120
 121         context->free_pixels = 0;
 122
 123         return context;
 124 }
 125
 126 int GP_ContextResize(GP_Context *context, GP_Size w, GP_Size h)
 127 {
 128         uint32_t bpr = get_bpr(context->bpp, w);
 129         void *pixels;
 130
 131         pixels = realloc(context->pixels, bpr * h);
 132
 133         if (pixels == NULL)
 134                 return 1;
 135
 136         context->w = w;
 137         context->h = h;
 138         context->bytes_per_row = bpr;
 139         context->pixels = pixels;
 140
 141         return 0;
 142 }
 143
 144 GP_Context *GP_ContextCopy(const GP_Context *src, int flags)
 145 {
 146         GP_Context *new;
 147         uint8_t *pixels;
 148
 149         if (src == NULL)
 150                 return NULL;
 151
 152         new     = malloc(sizeof(GP_Context));
 153         pixels  = malloc(src->bytes_per_row * src->h);
 154
 155         if (pixels == NULL || new == NULL) {
 156                 free(pixels);
 157                 free(new);
 158                 GP_WARN("Malloc failed :(");
 159                 errno = ENOMEM;
 160                 return NULL;
 161         }
 162
 163         new->pixels = pixels;
 164
 165         if (flags & GP_COPY_WITH_PIXELS)
 166                 memcpy(pixels, src->pixels, src->bytes_per_row * src->h);
 167
 168         new->bpp           = src->bpp;
 169         new->bytes_per_row = src->bytes_per_row;
 170         new->offset        = 0;
 171
 172         new->w = src->w;
 173         new->h = src->h;
 174
 175         new->pixel_type = src->pixel_type;
 176         new->bit_endian = src->bit_endian;
 177
 178         if (flags & GP_COPY_WITH_ROTATION)
 179                 GP_ContextCopyRotation(src, new);
 180         else
 181                 GP_ContextSetRotation(new, 0, 0, 0);
 182
 183         //TODO: Copy the gamma too
 184         new->gamma = NULL;
 185
 186         new->free_pixels = 1;
 187
 188         return new;
 189 }
 190
 191
 192 GP_Context *GP_ContextConvertAlloc(const GP_Context *src,
 193                                    GP_PixelType dst_pixel_type)
 194 {
 195         int w = GP_ContextW(src);
 196         int h = GP_ContextH(src);
 197
 198         GP_Context *ret = GP_ContextAlloc(w, h, dst_pixel_type);
 199
 200         if (ret == NULL)
 201                 return NULL;
 202
 203         GP_Blit(src, 0, 0, w, h, ret, 0, 0);
 204
 205         return ret;
 206 }
 207
 208 GP_Context *GP_ContextConvert(const GP_Context *src, GP_Context *dst)
 209 {
 210         //TODO: Asserts
 211         int w = GP_ContextW(src);
 212         int h = GP_ContextH(src);
 213
 214         GP_Blit(src, 0, 0, w, h, dst, 0, 0);
 215
 216         return dst;
 217 }
 218
 219 GP_Context *GP_SubContextAlloc(const GP_Context *context,
 220                                GP_Coord x, GP_Coord y, GP_Size w, GP_Size h)
 221 {
 222         GP_Context *res = malloc(sizeof(GP_Context));
 223
 224         if (res == NULL) {
 225                 GP_WARN("Malloc failed :(");
 226                 errno = ENOMEM;
 227                 return NULL;
 228         }
 229
 230         return GP_SubContext(context, res, x, y, w, h);
 231 }
 232
 233 GP_Context *GP_SubContext(const GP_Context *context, GP_Context *subcontext,
 234                           GP_Coord x, GP_Coord y, GP_Size w, GP_Size h)
 235 {
 236         GP_CHECK(context, "NULL context");
 237
 238         GP_TRANSFORM_RECT(context, x, y, w, h);
 239
 240         GP_CHECK(context->w >= x + w, "Subcontext w out of original context.");
 241         GP_CHECK(context->h >= y + h, "Subcontext h out of original context.");
 242
 243         subcontext->bpp           = context->bpp;
 244         subcontext->bytes_per_row = context->bytes_per_row;
 245         subcontext->offset        = (context->offset +
 246                                     GP_PixelAddrOffset(x, context->pixel_type)) % 8;
 247
 248         subcontext->w = w;
 249         subcontext->h = h;
 250
 251         subcontext->pixel_type = context->pixel_type;
 252         subcontext->bit_endian = context->bit_endian;
 253
 254         /* gamma */
 255         subcontext->gamma = context->gamma;
 256
 257         /* rotation and mirroring */
 258         GP_ContextCopyRotation(context, subcontext);
 259
 260         subcontext->pixels = GP_PIXEL_ADDR(context, x, y);
 261
 262         subcontext->free_pixels = 0;
 263
 264         return subcontext;
 265 }
 266
 267 void GP_ContextPrintInfo(const GP_Context *self)
 268 {
 269         printf("Context info\n");
 270         printf("------------\n");
 271         printf("Size\t%ux%u\n", self->w, self->h);
 272         printf("BPP\t%u\n", self->bpp);
 273         printf("BPR\t%u\n", self->bytes_per_row);
 274         printf("Pixel\t%s (%u)\n", GP_PixelTypeName(self->pixel_type),
 275                self->pixel_type);
 276         printf("Offset\t%u (only unaligned pixel types)\n", self->offset);
 277         printf("Flags\taxes_swap=%u x_swap=%u y_swap=%u free_pixels=%u\n",
 278                self->axes_swap, self->x_swap, self->y_swap, self->free_pixels);
 279         printf("Gamma table %p\n", self->gamma);
 280 }
 281
 282 /*
 283  * The context rotations consists of two cyclic permutation groups that are
 284  * mirrored.
 285  *
 286  * The flags change as follows:
 287  *
 288  * One group:
 289  *
 290  * x_swap y_swap axes_swap
 291  *      0      0         0
 292  *      1      0         1
 293  *      1      1         0
 294  *      0      1         1
 295  *
 296  * And mirrored group:
 297  *
 298  * x_swap y_swap axes_swap
 299  *      0      0         1
 300  *      1      0         0
 301  *      1      1         1
 302  *      0      1         0
 303  *
 304  */
 305 void GP_ContextRotateCW(GP_Context *context)
 306 {
 307         context->axes_swap = !context->axes_swap;
 308
 309         if (!context->x_swap && !context->y_swap) {
 310                 context->x_swap = 1;
 311                 return;
 312         }
 313
 314         if (context->x_swap && !context->y_swap) {
 315                 context->y_swap = 1;
 316                 return;
 317         }
 318
 319         if (context->x_swap && context->y_swap) {
 320                 context->x_swap = 0;
 321                 return;
 322         }
 323
 324         context->y_swap  = 0;
 325 }
 326
 327 void GP_ContextRotateCCW(GP_Context *context)
 328 {
 329         context->axes_swap = !context->axes_swap;
 330
 331         if (!context->x_swap && !context->y_swap) {
 332                 context->y_swap = 1;
 333                 return;
 334         }
 335
 336         if (context->x_swap && !context->y_swap) {
 337                 context->x_swap = 0;
 338                 return;
 339         }
 340
 341         if (context->x_swap && context->y_swap) {
 342                 context->y_swap = 0;
 343                 return;
 344         }
 345
 346         context->x_swap  = 1;
 347 }