dlls/gdiplus/region.c

   1 /*
   2  * Copyright (C) 2008 Google (Lei Zhang)
   3  *
   4  * This library 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  * This library 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 this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <stdarg.h>
  20
  21 #include "windef.h"
  22 #include "winbase.h"
  23 #include "wingdi.h"
  24
  25 #include "objbase.h"
  26
  27 #include "gdiplus.h"
  28 #include "gdiplus_private.h"
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
  32
  33 /**********************************************************
  34  *
  35  * Data returned by GdipGetRegionData looks something like this:
  36  *
  37  * struct region_data_header
  38  * {
  39  *   DWORD size;     size in bytes of the data - 8.
  40  *   DWORD magic1;   probably a checksum.
  41  *   DWORD magic2;   always seems to be 0xdbc01001 - version?
  42  *   DWORD num_ops;  number of combining ops * 2
  43  * };
  44  *
  45  * Then follows a sequence of combining ops and region elements.
  46  *
  47  * A region element is either a RECTF or some path data.
  48  *
  49  * Combining ops are just stored as their CombineMode value.
  50  *
  51  * Each RECTF is preceded by the DWORD 0x10000000.  An empty rect is
  52  * stored as 0x10000002 (with no following RECTF) and an infinite rect
  53  * is stored as 0x10000003 (again with no following RECTF).
  54  *
  55  * Path data is preceded by the DWORD 0x10000001.  Then follows a
  56  * DWORD size and then size bytes of data.
  57  *
  58  * The combining ops are stored in the reverse order to the region
  59  * elements and in the reverse order to which the region was
  60  * constructed.
  61  *
  62  * When two or more complex regions (ie those with more than one
  63  * element) are combined, the combining op for the two regions comes
  64  * first, then the combining ops for the region elements in region 1,
  65  * followed by the region elements for region 1, then follows the
  66  * combining ops for region 2 and finally region 2's region elements.
  67  * Presumably you're supposed to use the 0x1000000x header to find the
  68  * end of the op list (the count of the elements in each region is not
  69  * stored).
  70  *
  71  * When a simple region (1 element) is combined, it's treated as if a
  72  * single rect/path is being combined.
  73  *
  74  */
  75
  76 typedef enum RegionType
  77 {
  78     RegionDataRect          = 0x10000000,
  79     RegionDataPath          = 0x10000001,
  80     RegionDataEmptyRect     = 0x10000002,
  81     RegionDataInfiniteRect  = 0x10000003,
  82 } RegionType;
  83
  84 /* Header size as far as header->size is concerned. This doesn't include
  85  * header->size or header->checksum
  86  */
  87 static const INT sizeheader_size = sizeof(DWORD) * 2;
  88
  89 static inline INT get_element_size(const region_element* element)
  90 {
  91     INT needed = sizeof(DWORD); /* DWORD for the type */
  92     switch(element->type)
  93     {
  94         case RegionDataRect:
  95             return needed + sizeof(GpRect);
  96         case RegionDataPath:
  97              needed += element->elementdata.pathdata.pathheader.size;
  98              needed += sizeof(DWORD); /* Extra DWORD for pathheader.size */
  99              return needed;
 100         case RegionDataEmptyRect:
 101         case RegionDataInfiniteRect:
 102             return needed;
 103         default:
 104             needed += get_element_size(element->elementdata.combine.left);
 105             needed += get_element_size(element->elementdata.combine.right);
 106             return needed;
 107     }
 108
 109     return 0;
 110 }
 111
 112 /* Does not check parameters, caller must do that */
 113 static inline GpStatus init_region(GpRegion* region, const RegionType type)
 114 {
 115     region->node.type       = type;
 116     region->header.checksum = 0xdeadbeef;
 117     region->header.magic    = VERSION_MAGIC;
 118     region->header.num_children  = 0;
 119     region->header.size     = sizeheader_size + get_element_size(&region->node);
 120
 121     return Ok;
 122 }
 123
 124 static inline void delete_element(region_element* element)
 125 {
 126     switch(element->type)
 127     {
 128         case RegionDataRect:
 129             break;
 130         case RegionDataPath:
 131             GdipDeletePath(element->elementdata.pathdata.path);
 132             break;
 133         case RegionDataEmptyRect:
 134         case RegionDataInfiniteRect:
 135             break;
 136         default:
 137             delete_element(element->elementdata.combine.left);
 138             delete_element(element->elementdata.combine.right);
 139             GdipFree(element->elementdata.combine.left);
 140             GdipFree(element->elementdata.combine.right);
 141             break;
 142     }
 143 }
 144
 145 GpStatus WINGDIPAPI GdipCloneRegion(GpRegion *region, GpRegion **clone)
 146 {
 147     FIXME("(%p %p): stub\n", region, clone);
 148
 149     *clone = NULL;
 150     return NotImplemented;
 151 }
 152
 153 GpStatus WINGDIPAPI GdipCombineRegionPath(GpRegion *region, GpPath *path, CombineMode mode)
 154 {
 155     FIXME("(%p %p %d): stub\n", region, path, mode);
 156     return NotImplemented;
 157 }
 158
 159 GpStatus WINGDIPAPI GdipCombineRegionRect(GpRegion *region, GDIPCONST GpRectF *rect,
 160                                           CombineMode mode)
 161 {
 162     FIXME("(%p %p %d): stub\n", region, rect, mode);
 163     return NotImplemented;
 164 }
 165
 166 GpStatus WINGDIPAPI GdipCombineRegionRectI(GpRegion *region, GDIPCONST GpRect *rect,
 167                                            CombineMode mode)
 168 {
 169     FIXME("(%p %p %d): stub\n", region, rect, mode);
 170     return NotImplemented;
 171 }
 172
 173 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1, GpRegion *region2,
 174                                             CombineMode mode)
 175 {
 176     FIXME("(%p %p %d): stub\n", region1, region2, mode);
 177     return NotImplemented;
 178 }
 179
 180 GpStatus WINGDIPAPI GdipCreateRegion(GpRegion **region)
 181 {
 182     if(!region)
 183         return InvalidParameter;
 184
 185     TRACE("%p\n", region);
 186
 187     *region = GdipAlloc(sizeof(GpRegion));
 188     if(!*region)
 189         return OutOfMemory;
 190
 191     return init_region(*region, RegionDataInfiniteRect);
 192 }
 193
 194 GpStatus WINGDIPAPI GdipCreateRegionPath(GpPath *path, GpRegion **region)
 195 {
 196     FIXME("(%p, %p): stub\n", path, region);
 197
 198     *region = NULL;
 199     return NotImplemented;
 200 }
 201
 202 GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect, GpRegion **region)
 203 {
 204     FIXME("(%p, %p): stub\n", rect, region);
 205
 206     *region = NULL;
 207     return NotImplemented;
 208 }
 209
 210 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect, GpRegion **region)
 211 {
 212     FIXME("(%p, %p): stub\n", rect, region);
 213
 214     *region = NULL;
 215     return NotImplemented;
 216 }
 217
 218 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 219 {
 220     FIXME("(%p, %d, %p): stub\n", data, size, region);
 221
 222     *region = NULL;
 223     return NotImplemented;
 224 }
 225
 226 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 227 {
 228     FIXME("(%p, %p): stub\n", hrgn, region);
 229
 230     *region = NULL;
 231     return NotImplemented;
 232 }
 233
 234 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 235 {
 236     TRACE("%p\n", region);
 237
 238     if (!region)
 239         return InvalidParameter;
 240
 241     delete_element(&region->node);
 242     GdipFree(region);
 243
 244     return Ok;
 245 }
 246
 247 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 248 {
 249     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 250
 251     return NotImplemented;
 252 }
 253
 254 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 255 {
 256     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 257
 258     return NotImplemented;
 259 }
 260
 261 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size, UINT *needed)
 262 {
 263     FIXME("(%p, %p, %d, %p): stub\n", region, buffer, size, needed);
 264
 265     return NotImplemented;
 266 }
 267
 268 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 269 {
 270     if (!(region && needed))
 271         return InvalidParameter;
 272
 273     TRACE("%p, %p\n", region, needed);
 274
 275     /* header.size doesn't count header.size and header.checksum */
 276     *needed = region->header.size + sizeof(DWORD) * 2;
 277
 278     return Ok;
 279 }
 280
 281 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
 282 {
 283     FIXME("(%p, %p, %p): stub\n", region, graphics, hrgn);
 284
 285     *hrgn = NULL;
 286     return NotImplemented;
 287 }
 288
 289 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 290 {
 291     FIXME("(%p, %p, %p): stub\n", region, graphics, res);
 292
 293     return NotImplemented;
 294 }
 295
 296 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
 297                                       BOOL *res)
 298 {
 299     FIXME("(%p, %p, %p, %p): stub\n", region, region2, graphics, res);
 300
 301     return NotImplemented;
 302 }
 303
 304 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 305 {
 306     FIXME("(%p, %p, %p): stub\n", region, graphics, res);
 307
 308     return NotImplemented;
 309 }
 310
 311 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
 312 {
 313     GpStatus stat;
 314
 315     TRACE("%p\n", region);
 316
 317     if (!region)
 318         return InvalidParameter;
 319
 320     delete_element(&region->node);
 321     stat = init_region(region, RegionDataEmptyRect);
 322
 323     return stat;
 324 }
 325
 326 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
 327 {
 328     GpStatus stat;
 329
 330     if (!region)
 331         return InvalidParameter;
 332
 333     TRACE("%p", region);
 334
 335     delete_element(&region->node);
 336     stat = init_region(region, RegionDataInfiniteRect);
 337
 338     return stat;
 339 }
 340
 341 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
 342 {
 343     FIXME("(%p, %p): stub\n", region, matrix);
 344
 345     return NotImplemented;
 346 }
 347
 348 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
 349 {
 350     FIXME("(%p, %f, %f): stub\n", region, dx, dy);
 351
 352     return NotImplemented;
 353 }
 354
 355 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
 356 {
 357     FIXME("(%p, %d, %d): stub\n", region, dx, dy);
 358
 359     return NotImplemented;
 360 }