2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS kernel
4 * PURPOSE: GDI Color Translation Functions
5 * FILE: subsys/win32k/eng/xlate.c
6 * PROGRAMER: Jason Filby
11 // TODO: Cache XLATEOBJs that are created by EngCreateXlate by checking if the given palettes match a cached list
13 #include <ddk/ntddk.h>
14 #include <ddk/winddi.h>
15 #include <ddk/ntddvid.h>
17 #include <include/object.h>
21 #include <win32k/debug1.h>
23 ULONG CCMLastSourceColor = 0, CCMLastColorMatch = 0;
25 ULONG RGBtoULONG(BYTE Red, BYTE Green, BYTE Blue)
27 return ((Red & 0xff) << 16) | ((Green & 0xff) << 8) | (Blue & 0xff);
30 ULONG BGRtoULONG(BYTE Blue, BYTE Green, BYTE Red)
32 return ((Blue & 0xff) << 16) | ((Green & 0xff) << 8) | (Red & 0xff);
46 // FIXME: If the caller knows that the destinations are indexed and not RGB
47 // then we should cache more than one value. Same with the source.
49 // Takes indexed palette and a
50 ULONG ClosestColorMatch(ULONG SourceColor, ULONG *DestColors,
53 PVIDEO_CLUTDATA cSourceColor;
54 PVIDEO_CLUTDATA cDestColors;
56 ULONG cxRed, cxGreen, cxBlue, BestMatch = 16777215;
58 // Simple cache -- only one value because we don't want to waste time
59 // if the colors aren't very sequential
61 if(SourceColor == CCMLastSourceColor)
63 return CCMLastColorMatch;
66 cSourceColor = (PVIDEO_CLUTDATA)&SourceColor;
67 for (i=0; i<NumColors; i++)
69 cDestColors = (PVIDEO_CLUTDATA)&DestColors[i];
71 cxRed = abs(cSourceColor->Red - cDestColors->Red) ^ 2;
72 cxGreen = abs(cSourceColor->Green - cDestColors->Green) ^ 2;
73 cxBlue = abs(cSourceColor->Blue - cDestColors->Blue) ^ 2;
75 rt = /* sqrt */ (cxRed + cxGreen + cxBlue);
84 CCMLastSourceColor = SourceColor;
85 CCMLastColorMatch = idx;
90 VOID IndexedToIndexedTranslationTable(ULONG *TranslationTable,
91 PALGDI *PalDest, PALGDI *PalSource)
95 for(i=0; i<PalSource->NumColors; i++)
97 TranslationTable[i] = ClosestColorMatch(PalSource->IndexedColors[i], PalDest->IndexedColors, PalDest->NumColors);
101 XLATEOBJ *EngCreateXlate(USHORT DestPalType, USHORT SourcePalType,
102 HPALETTE PaletteDest, HPALETTE PaletteSource)
104 // FIXME: Add support for BGR conversions
109 PALGDI *SourcePalGDI, *DestPalGDI;
112 NewXlate = (HPALETTE)CreateGDIHandle(sizeof( XLATEGDI ), sizeof( XLATEOBJ ));
113 if( !ValidEngHandle( NewXlate ) )
116 XlateObj = (XLATEOBJ*) AccessUserObject( NewXlate );
117 XlateGDI = (XLATEGDI*) AccessInternalObject( NewXlate );
121 if(SourcePalType == PAL_INDEXED)
122 SourcePalGDI = (PALGDI*)AccessInternalObject((ULONG)PaletteSource);
123 if(DestPalType == PAL_INDEXED)
124 DestPalGDI = (PALGDI*)AccessInternalObject((ULONG)PaletteDest);
126 XlateObj->iSrcType = SourcePalType;
127 XlateObj->iDstType = DestPalType;
129 // Store handles of palettes in internal Xlate GDI object (or NULLs)
130 XlateGDI->DestPal = PaletteDest;
131 XlateGDI->SourcePal = PaletteSource;
133 XlateObj->flXlate = 0;
135 // If source and destination palettes are the same or if they're RGB/BGR
136 if( (PaletteDest == PaletteSource) ||
137 ((DestPalType == PAL_RGB) && (SourcePalType == PAL_RGB)) ||
138 ((DestPalType == PAL_BGR) && (SourcePalType == PAL_BGR)) )
140 XlateObj->flXlate |= XO_TRIVIAL;
144 // Prepare the translation table
145 if( (SourcePalType == PAL_INDEXED) || (SourcePalType == PAL_RGB) )
147 XlateObj->flXlate |= XO_TABLE;
148 if ((SourcePalType == PAL_INDEXED) && (DestPalType == PAL_INDEXED))
150 if(SourcePalGDI->NumColors > DestPalGDI->NumColors)
152 IndexedColors = SourcePalGDI->NumColors;
154 IndexedColors = DestPalGDI->NumColors;
156 else if (SourcePalType == PAL_INDEXED) { IndexedColors = SourcePalGDI->NumColors; }
157 else if (DestPalType == PAL_INDEXED) { IndexedColors = DestPalGDI->NumColors; }
159 XlateGDI->translationTable = EngAllocMem(FL_ZERO_MEMORY, sizeof(ULONG)*IndexedColors, 0);
162 // Source palette is indexed
163 if(XlateObj->iSrcType == PAL_INDEXED)
165 if(XlateObj->iDstType == PAL_INDEXED)
167 // Converting from indexed to indexed
168 IndexedToIndexedTranslationTable(XlateGDI->translationTable, DestPalGDI, SourcePalGDI);
170 if(XlateObj->iDstType == PAL_RGB)
172 // FIXME: Is this necessary? I think the driver has to call this
173 // function anyways if pulXlate is NULL and Source is PAL_INDEXED
175 // Converting from indexed to RGB
177 XLATEOBJ_cGetPalette(XlateObj, XO_SRCPALETTE,
178 SourcePalGDI->NumColors,
179 XlateGDI->translationTable);
182 XlateObj->pulXlate = XlateGDI->translationTable;
185 // Source palette is RGB
186 if(XlateObj->iSrcType == PAL_RGB)
188 if(XlateObj->iDstType == PAL_INDEXED)
190 // FIXME: Is this necessary? I think the driver has to call this
191 // function anyways if pulXlate is NULL and Dest is PAL_INDEXED
193 // Converting from RGB to indexed
194 XLATEOBJ_cGetPalette(XlateObj, XO_DESTPALETTE, DestPalGDI->NumColors, XlateGDI->translationTable);
198 // FIXME: Add support for XO_TO_MONO
202 VOID EngDeleteXlate(XLATEOBJ *XlateObj)
204 HPALETTE HXlate = (HPALETTE)AccessHandleFromUserObject(XlateObj);
205 XLATEGDI *XlateGDI = (XLATEGDI*)AccessInternalObject((ULONG)HXlate);
207 if(XlateGDI->translationTable!=NULL)
209 EngFreeMem(XlateGDI->translationTable);
212 FreeGDIHandle((ULONG)HXlate);
216 XLATEOBJ_piVector(XLATEOBJ *XlateObj)
218 XLATEGDI *XlateGDI = (XLATEGDI*)AccessInternalObjectFromUserObject(XlateObj);
220 if(XlateObj->iSrcType == PAL_INDEXED)
222 return XlateGDI->translationTable;
229 XLATEOBJ_iXlate(XLATEOBJ *XlateObj,
233 XLATEGDI *XlateGDI = (XLATEGDI*)AccessInternalObjectFromUserObject(XlateObj);
235 // Return the original color if there's no color translation object
236 if(!XlateObj) return Color;
238 if(XlateObj->flXlate & XO_TRIVIAL)
242 if(XlateObj->iSrcType == PAL_RGB)
244 // FIXME: should we cache colors used often?
245 // FIXME: won't work if destination isn't indexed
247 // Extract the destination palette
248 PalGDI = (PALGDI*)AccessInternalObject((ULONG)XlateGDI->DestPal);
250 // Return closest match for the given RGB color
251 return ClosestColorMatch(Color, PalGDI->IndexedColors, PalGDI->NumColors);
253 if(XlateObj->iSrcType == PAL_INDEXED)
255 return XlateGDI->translationTable[Color];
262 XLATEOBJ_cGetPalette(XLATEOBJ *XlateObj,
272 XlateGDI = (XLATEGDI*)AccessInternalObjectFromUserObject(XlateObj);
274 if(PalOutType == XO_SRCPALETTE)
276 HPal = XlateGDI->SourcePal;
278 if(PalOutType == XO_DESTPALETTE)
280 HPal = XlateGDI->DestPal;
283 PalGDI = (PALGDI*)AccessInternalObject((ULONG)HPal);
284 RtlCopyMemory(OutPal, PalGDI->IndexedColors, sizeof(ULONG)*cPal);