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