dlls/gdiplus/gdiplus.c

   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 #include <stdarg.h>
  20 #include <math.h>
  21
  22 #include "windef.h"
  23 #include "winbase.h"
  24 #include "winerror.h"
  25 #include "wine/debug.h"
  26 #include "wingdi.h"
  27
  28 #include "objbase.h"
  29
  30 #include "winreg.h"
  31 #include "shlwapi.h"
  32
  33 #include "gdiplus.h"
  34 #include "gdiplus_private.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
  37
  38 static Status WINAPI NotificationHook(ULONG_PTR *token)
  39 {
  40     TRACE("%p\n", token);
  41     if(!token)
  42         return InvalidParameter;
  43
  44     return Ok;
  45 }
  46
  47 static void WINAPI NotificationUnhook(ULONG_PTR token)
  48 {
  49     TRACE("%ld\n", token);
  50 }
  51
  52 /*****************************************************
  53  *      DllMain
  54  */
  55 BOOL WINAPI DllMain(HINSTANCE hinst, DWORD reason, LPVOID reserved)
  56 {
  57     TRACE("(%p, %d, %p)\n", hinst, reason, reserved);
  58
  59     switch(reason)
  60     {
  61     case DLL_WINE_PREATTACH:
  62         return FALSE;  /* prefer native version */
  63
  64     case DLL_PROCESS_ATTACH:
  65         DisableThreadLibraryCalls( hinst );
  66         break;
  67     }
  68     return TRUE;
  69 }
  70
  71 /*****************************************************
  72  *      GdiplusStartup [GDIPLUS.@]
  73  */
  74 Status WINAPI GdiplusStartup(ULONG_PTR *token, const struct GdiplusStartupInput *input,
  75                              struct GdiplusStartupOutput *output)
  76 {
  77     if(!token || !input)
  78         return InvalidParameter;
  79
  80     TRACE("%p %p %p\n", token, input, output);
  81     TRACE("GdiplusStartupInput %d %p %d %d\n", input->GdiplusVersion,
  82           input->DebugEventCallback, input->SuppressBackgroundThread,
  83           input->SuppressExternalCodecs);
  84
  85     if(input->GdiplusVersion != 1)
  86         return UnsupportedGdiplusVersion;
  87
  88     if(input->SuppressBackgroundThread){
  89         if(!output)
  90             return InvalidParameter;
  91
  92         output->NotificationHook = NotificationHook;
  93         output->NotificationUnhook = NotificationUnhook;
  94     }
  95
  96     /* FIXME: DebugEventCallback ignored */
  97
  98     return Ok;
  99 }
 100
 101 /*****************************************************
 102  *      GdiplusShutdown [GDIPLUS.@]
 103  */
 104 void WINAPI GdiplusShutdown(ULONG_PTR token)
 105 {
 106     /* FIXME: no object tracking */
 107 }
 108
 109 /*****************************************************
 110  *      GdipAlloc [GDIPLUS.@]
 111  */
 112 void* WINGDIPAPI GdipAlloc(SIZE_T size)
 113 {
 114     return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
 115 }
 116
 117 /*****************************************************
 118  *      GdipFree [GDIPLUS.@]
 119  */
 120 void WINGDIPAPI GdipFree(void* ptr)
 121 {
 122     HeapFree(GetProcessHeap(), 0, ptr);
 123 }
 124
 125 /* Calculates the bezier points needed to fill in the arc portion starting at
 126  * angle start and ending at end.  These two angles should be no more than 90
 127  * degrees from each other.  x1, y1, x2, y2 describes the bounding box (upper
 128  * left and width and height).  Angles must be in radians. write_first indicates
 129  * that the first bezier point should be written out (usually this is false).
 130  * pt is the array of GpPointFs that gets written to.
 131  **/
 132 static void add_arc_part(GpPointF * pt, REAL x1, REAL y1, REAL x2, REAL y2,
 133     REAL start, REAL end, BOOL write_first)
 134 {
 135     REAL center_x, center_y, rad_x, rad_y, cos_start, cos_end,
 136         sin_start, sin_end, a, half;
 137     INT i;
 138
 139     rad_x = x2 / 2.0;
 140     rad_y = y2 / 2.0;
 141     center_x = x1 + rad_x;
 142     center_y = y1 + rad_y;
 143
 144     cos_start = cos(start);
 145     cos_end = cos(end);
 146     sin_start = sin(start);
 147     sin_end = sin(end);
 148
 149     half = (end - start) / 2.0;
 150     a = 4.0 / 3.0 * (1 - cos(half)) / sin(half);
 151
 152     if(write_first){
 153         pt[0].X = cos_start;
 154         pt[0].Y = sin_start;
 155     }
 156     pt[1].X = cos_start - a * sin_start;
 157     pt[1].Y = sin_start + a * cos_start;
 158
 159     pt[3].X = cos_end;
 160     pt[3].Y = sin_end;
 161     pt[2].X = cos_end + a * sin_end;
 162     pt[2].Y = sin_end - a * cos_end;
 163
 164     /* expand the points back from the unit circle to the ellipse */
 165     for(i = (write_first ? 0 : 1); i < 4; i ++){
 166         pt[i].X = pt[i].X * rad_x + center_x;
 167         pt[i].Y = pt[i].Y * rad_y + center_y;
 168     }
 169 }
 170
 171 /* We plot the curve as if it is on a circle then stretch the points.  This
 172  * adjusts the angles so that when we stretch the points they will end in the
 173  * right place. This is only complicated because atan and atan2 do not behave
 174  * conveniently. */
 175 static void unstretch_angle(REAL * angle, REAL rad_x, REAL rad_y)
 176 {
 177     REAL stretched;
 178     INT revs_off;
 179
 180     *angle = deg2rad(*angle);
 181
 182     if(fabs(cos(*angle)) < 0.00001 || fabs(sin(*angle)) < 0.00001)
 183         return;
 184
 185     stretched = gdiplus_atan2(sin(*angle) / fabs(rad_y), cos(*angle) / fabs(rad_x));
 186     revs_off = roundr(*angle / (2.0 * M_PI)) - roundr(stretched / (2.0 * M_PI));
 187     stretched += ((REAL)revs_off) * M_PI * 2.0;
 188     *angle = stretched;
 189 }
 190
 191 /* Stores the bezier points that correspond to the arc in points.  If points is
 192  * null, just return the number of points needed to represent the arc. */
 193 INT arc2polybezier(GpPointF * points, REAL x1, REAL y1, REAL x2, REAL y2,
 194     REAL startAngle, REAL sweepAngle)
 195 {
 196     INT i, count;
 197     REAL end_angle, start_angle, endAngle;
 198
 199     endAngle = startAngle + sweepAngle;
 200     unstretch_angle(&startAngle, x2 / 2.0, y2 / 2.0);
 201     unstretch_angle(&endAngle, x2 / 2.0, y2 / 2.0);
 202
 203     count = ceilf(fabs(endAngle - startAngle) / M_PI_2) * 3 + 1;
 204     /* don't make more than a full circle */
 205     count = min(MAX_ARC_PTS, count);
 206
 207     if(count == 1)
 208         return 0;
 209     if(!points)
 210         return count;
 211
 212     /* start_angle and end_angle are the iterative variables */
 213     start_angle = startAngle;
 214
 215     for(i = 0; i < count - 1; i += 3){
 216         /* check if we've overshot the end angle */
 217         if( sweepAngle > 0.0 )
 218             end_angle = min(start_angle + M_PI_2, endAngle);
 219         else
 220             end_angle = max(start_angle - M_PI_2, endAngle);
 221
 222         add_arc_part(&points[i], x1, y1, x2, y2, start_angle, end_angle, i == 0);
 223
 224         start_angle += M_PI_2 * (sweepAngle < 0.0 ? -1.0 : 1.0);
 225     }
 226
 227     return count;
 228 }
 229
 230 COLORREF ARGB2COLORREF(ARGB color)
 231 {
 232     /*
 233     Packing of these color structures:
 234     COLORREF:   00bbggrr
 235     ARGB:       aarrggbb
 236     FIXME:doesn't handle alpha channel
 237     */
 238     return (COLORREF)
 239         ((color & 0x0000ff) << 16) +
 240          (color & 0x00ff00) +
 241         ((color & 0xff0000) >> 16);
 242 }
 243
 244 /* Like atan2, but puts angle in correct quadrant if dx is 0. */
 245 REAL gdiplus_atan2(REAL dy, REAL dx)
 246 {
 247     if((dx == 0.0) && (dy != 0.0))
 248         return dy > 0.0 ? M_PI_2 : -M_PI_2;
 249
 250     return atan2(dy, dx);
 251 }
 252
 253 GpStatus hresult_to_status(HRESULT res)
 254 {
 255     switch(res){
 256         case S_OK:
 257             return Ok;
 258         case E_OUTOFMEMORY:
 259             return OutOfMemory;
 260         case E_INVALIDARG:
 261             return InvalidParameter;
 262         default:
 263             return GenericError;
 264     }
 265 }
 266
 267 /* converts a given unit to its value in pixels */
 268 REAL convert_unit(HDC hdc, GpUnit unit)
 269 {
 270     switch(unit)
 271     {
 272         case UnitInch:
 273             return (REAL) GetDeviceCaps(hdc, LOGPIXELSX);
 274         case UnitPoint:
 275             return ((REAL)GetDeviceCaps(hdc, LOGPIXELSX)) / 72.0;
 276         case UnitDocument:
 277             return ((REAL)GetDeviceCaps(hdc, LOGPIXELSX)) / 300.0;
 278         case UnitMillimeter:
 279             return ((REAL)GetDeviceCaps(hdc, LOGPIXELSX)) / 25.4;
 280         case UnitWorld:
 281             ERR("cannot convert UnitWorld\n");
 282             return 0.0;
 283         case UnitPixel:
 284         case UnitDisplay:
 285         default:
 286             return 1.0;
 287     }
 288 }