dll/win32/gdiplus/gdiplus_private.h

   1 /*
   2  * Copyright (C) 2007 Google (Evan Stade)
   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 #ifndef __WINE_GP_PRIVATE_H_
  20 #define __WINE_GP_PRIVATE_H_
  21
  22 #include <math.h>
  23 #include <stdarg.h>
  24
  25 #include "windef.h"
  26 #include "wingdi.h"
  27 #include "winbase.h"
  28 #include "winuser.h"
  29
  30 #include "objbase.h"
  31 #include "ocidl.h"
  32 #include "wincodecsdk.h"
  33 #include "wine/heap.h"
  34 #include "wine/list.h"
  35
  36 #include "gdiplus.h"
  37
  38 #define ARRAY_SIZE(array) (sizeof(array) / sizeof((array)[0]))
  39
  40 #define GP_DEFAULT_PENSTYLE (PS_GEOMETRIC | PS_SOLID | PS_ENDCAP_FLAT | PS_JOIN_MITER)
  41 #define MAX_ARC_PTS (13)
  42 #define MAX_DASHLEN (16) /* this is a limitation of gdi */
  43 #define INCH_HIMETRIC (2540)
  44
  45 #define VERSION_MAGIC  0xdbc01001
  46 #define VERSION_MAGIC2 0xdbc01002
  47 #define VALID_MAGIC(x) (((x) & 0xfffff000) == 0xdbc01000)
  48 #define TENSION_CONST (0.3)
  49
  50 #define GIF_DISPOSE_UNSPECIFIED 0
  51 #define GIF_DISPOSE_DO_NOT_DISPOSE 1
  52 #define GIF_DISPOSE_RESTORE_TO_BKGND 2
  53 #define GIF_DISPOSE_RESTORE_TO_PREV 3
  54
  55
  56 COLORREF ARGB2COLORREF(ARGB color) DECLSPEC_HIDDEN;
  57 HBITMAP ARGB2BMP(ARGB color) DECLSPEC_HIDDEN;
  58 extern INT arc2polybezier(GpPointF * points, REAL x1, REAL y1, REAL x2, REAL y2,
  59     REAL startAngle, REAL sweepAngle) DECLSPEC_HIDDEN;
  60 extern REAL gdiplus_atan2(REAL dy, REAL dx) DECLSPEC_HIDDEN;
  61 extern GpStatus hresult_to_status(HRESULT res) DECLSPEC_HIDDEN;
  62 extern REAL units_to_pixels(REAL units, GpUnit unit, REAL dpi) DECLSPEC_HIDDEN;
  63 extern REAL pixels_to_units(REAL pixels, GpUnit unit, REAL dpi) DECLSPEC_HIDDEN;
  64 extern REAL units_scale(GpUnit from, GpUnit to, REAL dpi) DECLSPEC_HIDDEN;
  65
  66 #define WineCoordinateSpaceGdiDevice ((GpCoordinateSpace)4)
  67
  68 extern GpStatus gdi_transform_acquire(GpGraphics *graphics);
  69 extern GpStatus gdi_transform_release(GpGraphics *graphics);
  70 extern GpStatus get_graphics_transform(GpGraphics *graphics, GpCoordinateSpace dst_space,
  71         GpCoordinateSpace src_space, GpMatrix *matrix) DECLSPEC_HIDDEN;
  72 extern GpStatus gdip_transform_points(GpGraphics *graphics, GpCoordinateSpace dst_space,
  73         GpCoordinateSpace src_space, GpPointF *points, INT count) DECLSPEC_HIDDEN;
  74
  75 extern GpStatus graphics_from_image(GpImage *image, GpGraphics **graphics) DECLSPEC_HIDDEN;
  76 extern GpStatus encode_image_png(GpImage *image, IStream* stream, GDIPCONST EncoderParameters* params) DECLSPEC_HIDDEN;
  77
  78 extern GpStatus METAFILE_GetGraphicsContext(GpMetafile* metafile, GpGraphics **result) DECLSPEC_HIDDEN;
  79 extern GpStatus METAFILE_GetDC(GpMetafile* metafile, HDC *hdc) DECLSPEC_HIDDEN;
  80 extern GpStatus METAFILE_ReleaseDC(GpMetafile* metafile, HDC hdc) DECLSPEC_HIDDEN;
  81 extern GpStatus METAFILE_GraphicsClear(GpMetafile* metafile, ARGB color) DECLSPEC_HIDDEN;
  82 extern GpStatus METAFILE_FillRectangles(GpMetafile* metafile, GpBrush* brush,
  83     GDIPCONST GpRectF* rects, INT count) DECLSPEC_HIDDEN;
  84 extern GpStatus METAFILE_SetClipRect(GpMetafile* metafile,
  85     REAL x, REAL y, REAL width, REAL height, CombineMode mode) DECLSPEC_HIDDEN;
  86 extern GpStatus METAFILE_SetClipRegion(GpMetafile* metafile, GpRegion* region, CombineMode mode) DECLSPEC_HIDDEN;
  87 extern GpStatus METAFILE_SetPageTransform(GpMetafile* metafile, GpUnit unit, REAL scale) DECLSPEC_HIDDEN;
  88 extern GpStatus METAFILE_SetWorldTransform(GpMetafile* metafile, GDIPCONST GpMatrix* transform) DECLSPEC_HIDDEN;
  89 extern GpStatus METAFILE_ScaleWorldTransform(GpMetafile* metafile, REAL sx, REAL sy, MatrixOrder order) DECLSPEC_HIDDEN;
  90 extern GpStatus METAFILE_MultiplyWorldTransform(GpMetafile* metafile, GDIPCONST GpMatrix* matrix, MatrixOrder order) DECLSPEC_HIDDEN;
  91 extern GpStatus METAFILE_RotateWorldTransform(GpMetafile* metafile, REAL angle, MatrixOrder order) DECLSPEC_HIDDEN;
  92 extern GpStatus METAFILE_TranslateWorldTransform(GpMetafile* metafile, REAL dx, REAL dy, MatrixOrder order) DECLSPEC_HIDDEN;
  93 extern GpStatus METAFILE_ResetWorldTransform(GpMetafile* metafile) DECLSPEC_HIDDEN;
  94 extern GpStatus METAFILE_BeginContainer(GpMetafile* metafile, GDIPCONST GpRectF *dstrect,
  95     GDIPCONST GpRectF *srcrect, GpUnit unit, DWORD StackIndex) DECLSPEC_HIDDEN;
  96 extern GpStatus METAFILE_BeginContainerNoParams(GpMetafile* metafile, DWORD StackIndex) DECLSPEC_HIDDEN;
  97 extern GpStatus METAFILE_EndContainer(GpMetafile* metafile, DWORD StackIndex) DECLSPEC_HIDDEN;
  98 extern GpStatus METAFILE_SaveGraphics(GpMetafile* metafile, DWORD StackIndex) DECLSPEC_HIDDEN;
  99 extern GpStatus METAFILE_RestoreGraphics(GpMetafile* metafile, DWORD StackIndex) DECLSPEC_HIDDEN;
 100 extern GpStatus METAFILE_GraphicsDeleted(GpMetafile* metafile) DECLSPEC_HIDDEN;
 101 extern GpStatus METAFILE_DrawImagePointsRect(GpMetafile* metafile, GpImage *image,
 102      GDIPCONST GpPointF *points, INT count, REAL srcx, REAL srcy, REAL srcwidth,
 103      REAL srcheight, GpUnit srcUnit, GDIPCONST GpImageAttributes* imageAttributes,
 104      DrawImageAbort callback, VOID *callbackData) DECLSPEC_HIDDEN;
 105 extern GpStatus METAFILE_AddSimpleProperty(GpMetafile *metafile, SHORT prop, SHORT val) DECLSPEC_HIDDEN;
 106 extern GpStatus METAFILE_DrawPath(GpMetafile *metafile, GpPen *pen, GpPath *path) DECLSPEC_HIDDEN;
 107 extern GpStatus METAFILE_FillPath(GpMetafile *metafile, GpBrush *brush, GpPath *path) DECLSPEC_HIDDEN;
 108 extern void METAFILE_Free(GpMetafile *metafile) DECLSPEC_HIDDEN;
 109
 110 extern void calc_curve_bezier(const GpPointF *pts, REAL tension, REAL *x1,
 111     REAL *y1, REAL *x2, REAL *y2) DECLSPEC_HIDDEN;
 112 extern void calc_curve_bezier_endp(REAL xend, REAL yend, REAL xadj, REAL yadj,
 113     REAL tension, REAL *x, REAL *y) DECLSPEC_HIDDEN;
 114
 115 extern void free_installed_fonts(void) DECLSPEC_HIDDEN;
 116
 117 extern BOOL lengthen_path(GpPath *path, INT len) DECLSPEC_HIDDEN;
 118
 119 extern DWORD write_region_data(const GpRegion *region, void *data) DECLSPEC_HIDDEN;
 120 extern DWORD write_path_data(GpPath *path, void *data) DECLSPEC_HIDDEN;
 121
 122 extern GpStatus trace_path(GpGraphics *graphics, GpPath *path) DECLSPEC_HIDDEN;
 123
 124 typedef struct region_element region_element;
 125 extern void delete_element(region_element *element) DECLSPEC_HIDDEN;
 126
 127 extern GpStatus get_hatch_data(GpHatchStyle hatchstyle, const char **result) DECLSPEC_HIDDEN;
 128
 129 static inline INT gdip_round(REAL x)
 130 {
 131     return (INT) floorf(x + 0.5);
 132 }
 133
 134 static inline INT ceilr(REAL x)
 135 {
 136     return (INT) ceilf(x);
 137 }
 138
 139 static inline REAL deg2rad(REAL degrees)
 140 {
 141     return M_PI * degrees / 180.0;
 142 }
 143
 144 static inline ARGB color_over(ARGB bg, ARGB fg)
 145 {
 146     BYTE b, g, r, a;
 147     BYTE bg_alpha, fg_alpha;
 148
 149     fg_alpha = (fg>>24)&0xff;
 150
 151     if (fg_alpha == 0xff) return fg;
 152
 153     if (fg_alpha == 0) return bg;
 154
 155     bg_alpha = (((bg>>24)&0xff) * (0xff-fg_alpha)) / 0xff;
 156
 157     if (bg_alpha == 0) return fg;
 158
 159     a = bg_alpha + fg_alpha;
 160     b = ((bg&0xff)*bg_alpha + (fg&0xff)*fg_alpha)/a;
 161     g = (((bg>>8)&0xff)*bg_alpha + ((fg>>8)&0xff)*fg_alpha)/a;
 162     r = (((bg>>16)&0xff)*bg_alpha + ((fg>>16)&0xff)*fg_alpha)/a;
 163
 164     return (a<<24)|(r<<16)|(g<<8)|b;
 165 }
 166
 167 /* fg is premult, bg and return value are not */
 168 static inline ARGB color_over_fgpremult(ARGB bg, ARGB fg)
 169 {
 170     BYTE b, g, r, a;
 171     BYTE bg_alpha, fg_alpha;
 172
 173     fg_alpha = (fg>>24)&0xff;
 174
 175     if (fg_alpha == 0) return bg;
 176
 177     bg_alpha = (((bg>>24)&0xff) * (0xff-fg_alpha)) / 0xff;
 178
 179     a = bg_alpha + fg_alpha;
 180     b = ((bg&0xff)*bg_alpha + (fg&0xff)*0xff)/a;
 181     g = (((bg>>8)&0xff)*bg_alpha + ((fg>>8)&0xff)*0xff)/a;
 182     r = (((bg>>16)&0xff)*bg_alpha + ((fg>>16)&0xff)*0xff)/a;
 183
 184     return (a<<24)|(r<<16)|(g<<8)|b;
 185 }
 186
 187 extern const char *debugstr_rectf(const RectF* rc) DECLSPEC_HIDDEN;
 188
 189 extern const char *debugstr_pointf(const PointF* pt) DECLSPEC_HIDDEN;
 190
 191 extern void convert_32bppARGB_to_32bppPARGB(UINT width, UINT height,
 192     BYTE *dst_bits, INT dst_stride, const BYTE *src_bits, INT src_stride) DECLSPEC_HIDDEN;
 193
 194 extern GpStatus convert_pixels(INT width, INT height,
 195     INT dst_stride, BYTE *dst_bits, PixelFormat dst_format,
 196     INT src_stride, const BYTE *src_bits, PixelFormat src_format, ColorPalette *palette) DECLSPEC_HIDDEN;
 197
 198 extern PixelFormat apply_image_attributes(const GpImageAttributes *attributes, LPBYTE data,
 199     UINT width, UINT height, INT stride, ColorAdjustType type, PixelFormat fmt) DECLSPEC_HIDDEN;
 200
 201 struct GpMatrix{
 202     REAL matrix[6];
 203 };
 204
 205 struct GpPen{
 206     UINT style;
 207     GpUnit unit;
 208     REAL width;
 209     GpLineCap endcap;
 210     GpLineCap startcap;
 211     GpDashCap dashcap;
 212     GpCustomLineCap *customstart;
 213     GpCustomLineCap *customend;
 214     GpLineJoin join;
 215     REAL miterlimit;
 216     GpDashStyle dash;
 217     REAL *dashes;
 218     INT numdashes;
 219     REAL offset;    /* dash offset */
 220     GpBrush *brush;
 221     GpPenAlignment align;
 222     GpMatrix transform;
 223 };
 224
 225 struct GpGraphics{
 226     HDC hdc;
 227     HWND hwnd;
 228     BOOL owndc;
 229     BOOL alpha_hdc;
 230     GpImage *image;
 231     ImageType image_type;
 232     SmoothingMode smoothing;
 233     CompositingQuality compqual;
 234     InterpolationMode interpolation;
 235     PixelOffsetMode pixeloffset;
 236     CompositingMode compmode;
 237     TextRenderingHint texthint;
 238     GpUnit unit;    /* page unit */
 239     REAL scale;     /* page scale */
 240     REAL xres, yres;
 241     GpMatrix worldtrans; /* world transform */
 242     BOOL busy;      /* hdc handle obtained by GdipGetDC */
 243     GpRegion *clip; /* in device coords */
 244     UINT textcontrast; /* not used yet. get/set only */
 245     struct list containers;
 246     GraphicsContainer contid; /* last-issued container ID */
 247     INT origin_x, origin_y;
 248     INT gdi_transform_acquire_count, gdi_transform_save;
 249     GpMatrix gdi_transform;
 250     HRGN gdi_clip;
 251     /* For giving the caller an HDC when we technically can't: */
 252     HBITMAP temp_hbitmap;
 253     int temp_hbitmap_width;
 254     int temp_hbitmap_height;
 255     BYTE *temp_bits;
 256     HDC temp_hdc;
 257 };
 258
 259 struct GpBrush{
 260     GpBrushType bt;
 261 };
 262
 263 struct GpHatch{
 264     GpBrush brush;
 265     GpHatchStyle hatchstyle;
 266     ARGB forecol;
 267     ARGB backcol;
 268 };
 269
 270 struct GpSolidFill{
 271     GpBrush brush;
 272     ARGB color;
 273 };
 274
 275 struct GpPathGradient{
 276     GpBrush brush;
 277     GpPath* path;
 278     ARGB centercolor;
 279     GpWrapMode wrap;
 280     BOOL gamma;
 281     GpPointF center;
 282     GpPointF focus;
 283     REAL* blendfac;  /* blend factors */
 284     REAL* blendpos;  /* blend positions */
 285     INT blendcount;
 286     ARGB *surroundcolors;
 287     INT surroundcolorcount;
 288     ARGB* pblendcolor; /* preset blend colors */
 289     REAL* pblendpos; /* preset blend positions */
 290     INT pblendcount;
 291     GpMatrix transform;
 292 };
 293
 294 struct GpLineGradient{
 295     GpBrush brush;
 296     GpPointF startpoint;
 297     GpPointF endpoint;
 298     ARGB startcolor;
 299     ARGB endcolor;
 300     RectF rect;
 301     GpWrapMode wrap;
 302     BOOL gamma;
 303     REAL* blendfac;  /* blend factors */
 304     REAL* blendpos;  /* blend positions */
 305     INT blendcount;
 306     ARGB* pblendcolor; /* preset blend colors */
 307     REAL* pblendpos; /* preset blend positions */
 308     INT pblendcount;
 309     GpMatrix transform;
 310 };
 311
 312 struct GpTexture{
 313     GpBrush brush;
 314     GpMatrix transform;
 315     GpImage *image;
 316     GpImageAttributes *imageattributes;
 317     BYTE *bitmap_bits; /* image bits converted to ARGB and run through imageattributes */
 318 };
 319
 320 struct GpPath{
 321     GpFillMode fill;
 322     GpPathData pathdata;
 323     BOOL newfigure; /* whether the next drawing action starts a new figure */
 324     INT datalen; /* size of the arrays in pathdata */
 325 };
 326
 327 struct GpPathIterator{
 328     GpPathData pathdata;
 329     INT subpath_pos;    /* for NextSubpath methods */
 330     INT marker_pos;     /* for NextMarker methods */
 331     INT pathtype_pos;   /* for NextPathType methods */
 332 };
 333
 334 struct GpCustomLineCap{
 335     CustomLineCapType type;
 336     GpPathData pathdata;
 337     BOOL fill;      /* TRUE for fill, FALSE for stroke */
 338     GpLineCap cap;  /* as far as I can tell, this value is ignored */
 339     REAL inset;     /* how much to adjust the end of the line */
 340     GpLineJoin join;
 341     REAL scale;
 342 };
 343
 344 struct GpAdjustableArrowCap{
 345     GpCustomLineCap cap;
 346     REAL middle_inset;
 347     REAL height;
 348     REAL width;
 349 };
 350
 351 struct GpImage{
 352     IWICBitmapDecoder *decoder;
 353     ImageType type;
 354     GUID format;
 355     UINT flags;
 356     UINT frame_count, current_frame;
 357     ColorPalette *palette;
 358     REAL xres, yres;
 359     LONG busy;
 360 };
 361
 362 #define EmfPlusObjectTableSize 64
 363
 364 typedef enum EmfPlusObjectType
 365 {
 366     ObjectTypeInvalid,
 367     ObjectTypeBrush,
 368     ObjectTypePen,
 369     ObjectTypePath,
 370     ObjectTypeRegion,
 371     ObjectTypeImage,
 372     ObjectTypeFont,
 373     ObjectTypeStringFormat,
 374     ObjectTypeImageAttributes,
 375     ObjectTypeCustomLineCap,
 376     ObjectTypeMax = ObjectTypeCustomLineCap,
 377 } EmfPlusObjectType;
 378
 379 /* Deserialized EmfPlusObject record. */
 380 struct emfplus_object {
 381     EmfPlusObjectType type;
 382     union {
 383         GpBrush *brush;
 384         GpPen *pen;
 385         GpPath *path;
 386         GpRegion *region;
 387         GpImage *image;
 388         GpFont *font;
 389         GpImageAttributes *image_attributes;
 390         void *object;
 391     } u;
 392 };
 393
 394 struct GpMetafile{
 395     GpImage image;
 396     GpRectF bounds;
 397     GpUnit unit;
 398     MetafileType metafile_type;
 399     HENHMETAFILE hemf;
 400     int preserve_hemf; /* if true, hemf belongs to the app and should not be deleted */
 401
 402     /* recording */
 403     HDC record_dc;
 404     GpGraphics *record_graphics;
 405     BYTE *comment_data;
 406     DWORD comment_data_size;
 407     DWORD comment_data_length;
 408     IStream *record_stream;
 409     BOOL auto_frame; /* If true, determine the frame automatically */
 410     GpPointF auto_frame_min, auto_frame_max;
 411     DWORD next_object_id;
 412
 413     /* playback */
 414     GpGraphics *playback_graphics;
 415     HDC playback_dc;
 416     GpPointF playback_points[3];
 417     GpRectF src_rect;
 418     HANDLETABLE *handle_table;
 419     int handle_count;
 420     XFORM gdiworldtransform;
 421     GpMatrix *world_transform;
 422     GpUnit page_unit;
 423     REAL page_scale;
 424     GpRegion *base_clip; /* clip region in device space for all metafile output */
 425     GpRegion *clip; /* clip region within the metafile */
 426     struct list containers;
 427     struct emfplus_object objtable[EmfPlusObjectTableSize];
 428 };
 429
 430 struct GpBitmap{
 431     GpImage image;
 432     INT width;
 433     INT height;
 434     PixelFormat format;
 435     ImageLockMode lockmode;
 436     BYTE *bitmapbits;   /* pointer to the buffer we passed in BitmapLockBits */
 437     HBITMAP hbitmap;
 438     HDC hdc;
 439     BYTE *bits; /* actual image bits if this is a DIB */
 440     INT stride; /* stride of bits if this is a DIB */
 441     BYTE *own_bits; /* image bits that need to be freed with this object */
 442     INT lockx, locky; /* X and Y coordinates of the rect when a bitmap is locked for writing. */
 443     IWICMetadataReader *metadata_reader; /* NULL if there is no metadata */
 444     UINT prop_count;
 445     PropertyItem *prop_item; /* cached image properties */
 446 };
 447
 448 struct GpCachedBitmap{
 449     GpImage *image;
 450 };
 451
 452 struct color_key{
 453     BOOL enabled;
 454     ARGB low;
 455     ARGB high;
 456 };
 457
 458 struct color_matrix{
 459     BOOL enabled;
 460     ColorMatrixFlags flags;
 461     ColorMatrix colormatrix;
 462     ColorMatrix graymatrix;
 463 };
 464
 465 struct color_remap_table{
 466     BOOL enabled;
 467     INT mapsize;
 468     ColorMap *colormap;
 469 };
 470
 471 enum imageattr_noop{
 472     IMAGEATTR_NOOP_UNDEFINED,
 473     IMAGEATTR_NOOP_SET,
 474     IMAGEATTR_NOOP_CLEAR,
 475 };
 476
 477 struct GpImageAttributes{
 478     WrapMode wrap;
 479     ARGB outside_color;
 480     BOOL clamp;
 481     struct color_key colorkeys[ColorAdjustTypeCount];
 482     struct color_matrix colormatrices[ColorAdjustTypeCount];
 483     struct color_remap_table colorremaptables[ColorAdjustTypeCount];
 484     BOOL gamma_enabled[ColorAdjustTypeCount];
 485     REAL gamma[ColorAdjustTypeCount];
 486     enum imageattr_noop noop[ColorAdjustTypeCount];
 487 };
 488
 489 struct GpFont{
 490     GpFontFamily *family;
 491     OUTLINETEXTMETRICW otm;
 492     REAL emSize; /* in font units */
 493     Unit unit;
 494 };
 495
 496 extern const struct GpStringFormat default_drawstring_format DECLSPEC_HIDDEN;
 497
 498 struct GpStringFormat{
 499     INT attr;
 500     LANGID lang;
 501     LANGID digitlang;
 502     StringAlignment align;
 503     StringTrimming trimming;
 504     HotkeyPrefix hkprefix;
 505     StringAlignment line_align;
 506     StringDigitSubstitute digitsub;
 507     INT tabcount;
 508     REAL firsttab;
 509     REAL *tabs;
 510     CharacterRange *character_ranges;
 511     INT range_count;
 512     BOOL generic_typographic;
 513 };
 514
 515 extern void init_generic_string_formats(void) DECLSPEC_HIDDEN;
 516 extern void free_generic_string_formats(void) DECLSPEC_HIDDEN;
 517
 518 struct GpFontCollection{
 519     GpFontFamily **FontFamilies;
 520     INT count;
 521     INT allocated;
 522 };
 523
 524 struct GpFontFamily{
 525     WCHAR FamilyName[LF_FACESIZE];
 526     UINT16 em_height, ascent, descent, line_spacing; /* in font units */
 527     int dpi;
 528 };
 529
 530 /* internal use */
 531 typedef enum RegionType
 532 {
 533     RegionDataRect          = 0x10000000,
 534     RegionDataPath          = 0x10000001,
 535     RegionDataEmptyRect     = 0x10000002,
 536     RegionDataInfiniteRect  = 0x10000003,
 537 } RegionType;
 538
 539 struct region_element
 540 {
 541     DWORD type; /* Rectangle, Path, SpecialRectangle, or CombineMode */
 542     union
 543     {
 544         GpRectF rect;
 545         GpPath *path;
 546         struct
 547         {
 548             struct region_element *left;  /* the original region */
 549             struct region_element *right; /* what *left was combined with */
 550         } combine;
 551     } elementdata;
 552 };
 553
 554 struct GpRegion{
 555     DWORD num_children;
 556     region_element node;
 557 };
 558
 559 struct memory_buffer
 560 {
 561     const BYTE *buffer;
 562     INT size, pos;
 563 };
 564
 565 static inline void init_memory_buffer(struct memory_buffer *mbuf, const BYTE *buffer, INT size)
 566 {
 567     mbuf->buffer = buffer;
 568     mbuf->size = size;
 569     mbuf->pos = 0;
 570 }
 571
 572 static inline const void *buffer_read(struct memory_buffer *mbuf, INT size)
 573 {
 574     if (mbuf->size - mbuf->pos >= size)
 575     {
 576         const void *data = mbuf->buffer + mbuf->pos;
 577         mbuf->pos += size;
 578         return data;
 579     }
 580     return NULL;
 581 }
 582
 583 typedef GpStatus (*gdip_format_string_callback)(HDC hdc,
 584     GDIPCONST WCHAR *string, INT index, INT length, GDIPCONST GpFont *font,
 585     GDIPCONST RectF *rect, GDIPCONST GpStringFormat *format,
 586     INT lineno, const RectF *bounds, INT *underlined_indexes,
 587     INT underlined_index_count, void *user_data);
 588
 589 GpStatus gdip_format_string(HDC hdc,
 590     GDIPCONST WCHAR *string, INT length, GDIPCONST GpFont *font,
 591     GDIPCONST RectF *rect, GDIPCONST GpStringFormat *format, int ignore_empty_clip,
 592     gdip_format_string_callback callback, void *user_data) DECLSPEC_HIDDEN;
 593
 594 void get_log_fontW(const GpFont *, GpGraphics *, LOGFONTW *) DECLSPEC_HIDDEN;
 595
 596 static inline BOOL image_lock(GpImage *image, BOOL *unlock)
 597 {
 598     LONG tid = GetCurrentThreadId(), owner_tid;
 599     owner_tid = InterlockedCompareExchange(&image->busy, tid, 0);
 600     *unlock = !owner_tid;
 601     return !owner_tid || owner_tid==tid;
 602 }
 603
 604 static inline void image_unlock(GpImage *image, BOOL unlock)
 605 {
 606     if (unlock) image->busy = 0;
 607 }
 608
 609 #endif