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wine/dlls/gdi32/palette.c
Alexandre Julliard 592e6aa942 gdi32: Work around a gcc array out of bounds warning.
2012-07-23 14:52:32 +02:00

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/*
* GDI palette objects
*
* Copyright 1993,1994 Alexandre Julliard
* Copyright 1996 Alex Korobka
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* NOTES:
* PALETTEOBJ is documented in the Dr. Dobbs Journal May 1993.
* Information in the "Undocumented Windows" is incorrect.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "wingdi.h"
#include "winuser.h"
#include "gdi_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(palette);
typedef BOOL (*unrealize_function)(HPALETTE);
typedef struct tagPALETTEOBJ
{
GDIOBJHDR header;
unrealize_function unrealize;
WORD version; /* palette version */
WORD count; /* count of palette entries */
PALETTEENTRY *entries;
} PALETTEOBJ;
static INT PALETTE_GetObject( HGDIOBJ handle, INT count, LPVOID buffer );
static BOOL PALETTE_UnrealizeObject( HGDIOBJ handle );
static BOOL PALETTE_DeleteObject( HGDIOBJ handle );
static const struct gdi_obj_funcs palette_funcs =
{
NULL, /* pSelectObject */
PALETTE_GetObject, /* pGetObjectA */
PALETTE_GetObject, /* pGetObjectW */
PALETTE_UnrealizeObject, /* pUnrealizeObject */
PALETTE_DeleteObject /* pDeleteObject */
};
/* Pointers to USER implementation of SelectPalette/RealizePalette */
/* they will be patched by USER on startup */
HPALETTE (WINAPI *pfnSelectPalette)(HDC hdc, HPALETTE hpal, WORD bkgnd ) = GDISelectPalette;
UINT (WINAPI *pfnRealizePalette)(HDC hdc) = GDIRealizePalette;
static UINT SystemPaletteUse = SYSPAL_STATIC; /* currently not considered */
static HPALETTE hPrimaryPalette = 0; /* used for WM_PALETTECHANGED */
static HPALETTE hLastRealizedPalette = 0; /* UnrealizeObject() needs it */
/***********************************************************************
* PALETTE_Init
*
* Create the system palette.
*/
HPALETTE PALETTE_Init(void)
{
const RGBQUAD *entries = get_default_color_table( 8 );
char buffer[FIELD_OFFSET( LOGPALETTE, palPalEntry[20] )];
LOGPALETTE *palPtr = (LOGPALETTE *)buffer;
int i;
/* create default palette (20 system colors) */
palPtr->palVersion = 0x300;
palPtr->palNumEntries = 20;
for (i = 0; i < 20; i++)
{
palPtr->palPalEntry[i].peRed = entries[i < 10 ? i : 236 + i].rgbRed;
palPtr->palPalEntry[i].peGreen = entries[i < 10 ? i : 236 + i].rgbGreen;
palPtr->palPalEntry[i].peBlue = entries[i < 10 ? i : 236 + i].rgbBlue;
palPtr->palPalEntry[i].peFlags = 0;
}
return CreatePalette( palPtr );
}
/***********************************************************************
* CreatePalette [GDI32.@]
*
* Creates a logical color palette.
*
* RETURNS
* Success: Handle to logical palette
* Failure: NULL
*/
HPALETTE WINAPI CreatePalette(
const LOGPALETTE* palette) /* [in] Pointer to logical color palette */
{
PALETTEOBJ * palettePtr;
HPALETTE hpalette;
int size;
if (!palette) return 0;
TRACE("entries=%i\n", palette->palNumEntries);
if (!(palettePtr = HeapAlloc( GetProcessHeap(), 0, sizeof(*palettePtr) ))) return 0;
palettePtr->unrealize = NULL;
palettePtr->version = palette->palVersion;
palettePtr->count = palette->palNumEntries;
size = palettePtr->count * sizeof(*palettePtr->entries);
if (!(palettePtr->entries = HeapAlloc( GetProcessHeap(), 0, size )))
{
HeapFree( GetProcessHeap(), 0, palettePtr );
return 0;
}
memcpy( palettePtr->entries, palette->palPalEntry, size );
if (!(hpalette = alloc_gdi_handle( &palettePtr->header, OBJ_PAL, &palette_funcs )))
{
HeapFree( GetProcessHeap(), 0, palettePtr->entries );
HeapFree( GetProcessHeap(), 0, palettePtr );
}
TRACE(" returning %p\n", hpalette);
return hpalette;
}
/***********************************************************************
* CreateHalftonePalette [GDI32.@]
*
* Creates a halftone palette.
*
* RETURNS
* Success: Handle to logical halftone palette
* Failure: 0
*
* FIXME: This simply creates the halftone palette derived from running
* tests on a windows NT machine. This is assuming a color depth
* of greater that 256 color. On a 256 color device the halftone
* palette will be different and this function will be incorrect
*/
HPALETTE WINAPI CreateHalftonePalette(
HDC hdc) /* [in] Handle to device context */
{
const RGBQUAD *entries = get_default_color_table( 8 );
char buffer[FIELD_OFFSET( LOGPALETTE, palPalEntry[256] )];
LOGPALETTE *pal = (LOGPALETTE *)buffer;
int i;
pal->palVersion = 0x300;
pal->palNumEntries = 256;
for (i = 0; i < 256; i++)
{
pal->palPalEntry[i].peRed = entries[i].rgbRed;
pal->palPalEntry[i].peGreen = entries[i].rgbGreen;
pal->palPalEntry[i].peBlue = entries[i].rgbBlue;
pal->palPalEntry[i].peFlags = 0;
}
return CreatePalette( pal );
}
/***********************************************************************
* GetPaletteEntries [GDI32.@]
*
* Retrieves palette entries.
*
* RETURNS
* Success: Number of entries from logical palette
* Failure: 0
*/
UINT WINAPI GetPaletteEntries(
HPALETTE hpalette, /* [in] Handle of logical palette */
UINT start, /* [in] First entry to receive */
UINT count, /* [in] Number of entries to receive */
LPPALETTEENTRY entries) /* [out] Address of array receiving entries */
{
PALETTEOBJ * palPtr;
UINT numEntries;
TRACE("hpal = %p, count=%i\n", hpalette, count );
palPtr = GDI_GetObjPtr( hpalette, OBJ_PAL );
if (!palPtr) return 0;
/* NOTE: not documented but test show this to be the case */
if (count == 0)
{
count = palPtr->count;
}
else
{
numEntries = palPtr->count;
if (start+count > numEntries) count = numEntries - start;
if (entries)
{
if (start >= numEntries) count = 0;
else memcpy( entries, &palPtr->entries[start], count * sizeof(PALETTEENTRY) );
}
}
GDI_ReleaseObj( hpalette );
return count;
}
/***********************************************************************
* SetPaletteEntries [GDI32.@]
*
* Sets color values for range in palette.
*
* RETURNS
* Success: Number of entries that were set
* Failure: 0
*/
UINT WINAPI SetPaletteEntries(
HPALETTE hpalette, /* [in] Handle of logical palette */
UINT start, /* [in] Index of first entry to set */
UINT count, /* [in] Number of entries to set */
const PALETTEENTRY *entries) /* [in] Address of array of structures */
{
PALETTEOBJ * palPtr;
UINT numEntries;
TRACE("hpal=%p,start=%i,count=%i\n",hpalette,start,count );
if (hpalette == GetStockObject(DEFAULT_PALETTE)) return 0;
palPtr = GDI_GetObjPtr( hpalette, OBJ_PAL );
if (!palPtr) return 0;
numEntries = palPtr->count;
if (start >= numEntries)
{
GDI_ReleaseObj( hpalette );
return 0;
}
if (start+count > numEntries) count = numEntries - start;
memcpy( &palPtr->entries[start], entries, count * sizeof(PALETTEENTRY) );
GDI_ReleaseObj( hpalette );
UnrealizeObject( hpalette );
return count;
}
/***********************************************************************
* ResizePalette [GDI32.@]
*
* Resizes logical palette.
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*/
BOOL WINAPI ResizePalette(
HPALETTE hPal, /* [in] Handle of logical palette */
UINT cEntries) /* [in] Number of entries in logical palette */
{
PALETTEOBJ * palPtr = GDI_GetObjPtr( hPal, OBJ_PAL );
PALETTEENTRY *entries;
if( !palPtr ) return FALSE;
TRACE("hpal = %p, prev = %i, new = %i\n", hPal, palPtr->count, cEntries );
if (!(entries = HeapReAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY,
palPtr->entries, cEntries * sizeof(*palPtr->entries) )))
{
GDI_ReleaseObj( hPal );
return FALSE;
}
palPtr->entries = entries;
palPtr->count = cEntries;
GDI_ReleaseObj( hPal );
PALETTE_UnrealizeObject( hPal );
return TRUE;
}
/***********************************************************************
* AnimatePalette [GDI32.@]
*
* Replaces entries in logical palette.
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*
* FIXME
* Should use existing mapping when animating a primary palette
*/
BOOL WINAPI AnimatePalette(
HPALETTE hPal, /* [in] Handle to logical palette */
UINT StartIndex, /* [in] First entry in palette */
UINT NumEntries, /* [in] Count of entries in palette */
const PALETTEENTRY* PaletteColors) /* [in] Pointer to first replacement */
{
TRACE("%p (%i - %i)\n", hPal, StartIndex,StartIndex+NumEntries);
if( hPal != GetStockObject(DEFAULT_PALETTE) )
{
PALETTEOBJ * palPtr;
UINT pal_entries;
const PALETTEENTRY *pptr = PaletteColors;
palPtr = GDI_GetObjPtr( hPal, OBJ_PAL );
if (!palPtr) return 0;
pal_entries = palPtr->count;
if (StartIndex >= pal_entries)
{
GDI_ReleaseObj( hPal );
return 0;
}
if (StartIndex+NumEntries > pal_entries) NumEntries = pal_entries - StartIndex;
for (NumEntries += StartIndex; StartIndex < NumEntries; StartIndex++, pptr++) {
/* According to MSDN, only animate PC_RESERVED colours */
if (palPtr->entries[StartIndex].peFlags & PC_RESERVED) {
TRACE("Animating colour (%d,%d,%d) to (%d,%d,%d)\n",
palPtr->entries[StartIndex].peRed,
palPtr->entries[StartIndex].peGreen,
palPtr->entries[StartIndex].peBlue,
pptr->peRed, pptr->peGreen, pptr->peBlue);
palPtr->entries[StartIndex] = *pptr;
} else {
TRACE("Not animating entry %d -- not PC_RESERVED\n", StartIndex);
}
}
GDI_ReleaseObj( hPal );
/* FIXME: check for palette selected in active window */
}
return TRUE;
}
/***********************************************************************
* SetSystemPaletteUse [GDI32.@]
*
* Specify whether the system palette contains 2 or 20 static colors.
*
* RETURNS
* Success: Previous system palette
* Failure: SYSPAL_ERROR
*/
UINT WINAPI SetSystemPaletteUse(
HDC hdc, /* [in] Handle of device context */
UINT use) /* [in] Palette-usage flag */
{
UINT old = SystemPaletteUse;
/* Device doesn't support colour palettes */
if (!(GetDeviceCaps(hdc, RASTERCAPS) & RC_PALETTE)) {
return SYSPAL_ERROR;
}
switch (use) {
case SYSPAL_NOSTATIC:
case SYSPAL_NOSTATIC256: /* WINVER >= 0x0500 */
case SYSPAL_STATIC:
SystemPaletteUse = use;
return old;
default:
return SYSPAL_ERROR;
}
}
/***********************************************************************
* GetSystemPaletteUse [GDI32.@]
*
* Gets state of system palette.
*
* RETURNS
* Current state of system palette
*/
UINT WINAPI GetSystemPaletteUse(
HDC hdc) /* [in] Handle of device context */
{
return SystemPaletteUse;
}
/***********************************************************************
* GetSystemPaletteEntries [GDI32.@]
*
* Gets range of palette entries.
*
* RETURNS
* Success: Number of entries retrieved from palette
* Failure: 0
*/
UINT WINAPI GetSystemPaletteEntries(
HDC hdc, /* [in] Handle of device context */
UINT start, /* [in] Index of first entry to be retrieved */
UINT count, /* [in] Number of entries to be retrieved */
LPPALETTEENTRY entries) /* [out] Array receiving system-palette entries */
{
UINT ret = 0;
DC *dc;
TRACE("hdc=%p,start=%i,count=%i\n", hdc,start,count);
if ((dc = get_dc_ptr( hdc )))
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pGetSystemPaletteEntries );
ret = physdev->funcs->pGetSystemPaletteEntries( physdev, start, count, entries );
release_dc_ptr( dc );
}
return ret;
}
/***********************************************************************
* GetNearestPaletteIndex [GDI32.@]
*
* Gets palette index for color.
*
* NOTES
* Should index be initialized to CLR_INVALID instead of 0?
*
* RETURNS
* Success: Index of entry in logical palette
* Failure: CLR_INVALID
*/
UINT WINAPI GetNearestPaletteIndex(
HPALETTE hpalette, /* [in] Handle of logical color palette */
COLORREF color) /* [in] Color to be matched */
{
PALETTEOBJ* palObj = GDI_GetObjPtr( hpalette, OBJ_PAL );
UINT index = 0;
if( palObj )
{
int i, diff = 0x7fffffff;
int r,g,b;
PALETTEENTRY* entry = palObj->entries;
for( i = 0; i < palObj->count && diff ; i++, entry++)
{
r = entry->peRed - GetRValue(color);
g = entry->peGreen - GetGValue(color);
b = entry->peBlue - GetBValue(color);
r = r*r + g*g + b*b;
if( r < diff ) { index = i; diff = r; }
}
GDI_ReleaseObj( hpalette );
}
TRACE("(%p,%06x): returning %d\n", hpalette, color, index );
return index;
}
/* null driver fallback implementation for GetNearestColor */
COLORREF nulldrv_GetNearestColor( PHYSDEV dev, COLORREF color )
{
unsigned char spec_type;
if (!(GetDeviceCaps( dev->hdc, RASTERCAPS ) & RC_PALETTE)) return color;
spec_type = color >> 24;
if (spec_type == 1 || spec_type == 2)
{
/* we need logical palette for PALETTERGB and PALETTEINDEX colorrefs */
UINT index;
PALETTEENTRY entry;
HPALETTE hpal = GetCurrentObject( dev->hdc, OBJ_PAL );
if (!hpal) hpal = GetStockObject( DEFAULT_PALETTE );
if (spec_type == 2) /* PALETTERGB */
index = GetNearestPaletteIndex( hpal, color );
else /* PALETTEINDEX */
index = LOWORD(color);
if (!GetPaletteEntries( hpal, index, 1, &entry ))
{
WARN("RGB(%x) : idx %d is out of bounds, assuming NULL\n", color, index );
if (!GetPaletteEntries( hpal, 0, 1, &entry )) return CLR_INVALID;
}
color = RGB( entry.peRed, entry.peGreen, entry.peBlue );
}
return color & 0x00ffffff;
}
/***********************************************************************
* GetNearestColor [GDI32.@]
*
* Gets a system color to match.
*
* RETURNS
* Success: Color from system palette that corresponds to given color
* Failure: CLR_INVALID
*/
COLORREF WINAPI GetNearestColor(
HDC hdc, /* [in] Handle of device context */
COLORREF color) /* [in] Color to be matched */
{
COLORREF nearest = CLR_INVALID;
DC *dc;
if ((dc = get_dc_ptr( hdc )))
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pGetNearestColor );
nearest = physdev->funcs->pGetNearestColor( physdev, color );
release_dc_ptr( dc );
}
return nearest;
}
/***********************************************************************
* PALETTE_GetObject
*/
static INT PALETTE_GetObject( HGDIOBJ handle, INT count, LPVOID buffer )
{
PALETTEOBJ *palette = GDI_GetObjPtr( handle, OBJ_PAL );
if (!palette) return 0;
if (buffer)
{
if (count > sizeof(WORD)) count = sizeof(WORD);
memcpy( buffer, &palette->count, count );
}
else count = sizeof(WORD);
GDI_ReleaseObj( handle );
return count;
}
/***********************************************************************
* PALETTE_UnrealizeObject
*/
static BOOL PALETTE_UnrealizeObject( HGDIOBJ handle )
{
PALETTEOBJ *palette = GDI_GetObjPtr( handle, OBJ_PAL );
if (palette)
{
unrealize_function unrealize = palette->unrealize;
palette->unrealize = NULL;
GDI_ReleaseObj( handle );
if (unrealize) unrealize( handle );
}
if (InterlockedCompareExchangePointer( (void **)&hLastRealizedPalette, 0, handle ) == handle)
TRACE("unrealizing palette %p\n", handle);
return TRUE;
}
/***********************************************************************
* PALETTE_DeleteObject
*/
static BOOL PALETTE_DeleteObject( HGDIOBJ handle )
{
PALETTEOBJ *obj;
PALETTE_UnrealizeObject( handle );
if (!(obj = free_gdi_handle( handle ))) return FALSE;
HeapFree( GetProcessHeap(), 0, obj->entries );
return HeapFree( GetProcessHeap(), 0, obj );
}
/***********************************************************************
* GDISelectPalette (Not a Windows API)
*/
HPALETTE WINAPI GDISelectPalette( HDC hdc, HPALETTE hpal, WORD wBkg)
{
HPALETTE ret = 0;
DC *dc;
TRACE("%p %p\n", hdc, hpal );
if (GetObjectType(hpal) != OBJ_PAL)
{
WARN("invalid selected palette %p\n",hpal);
return 0;
}
if ((dc = get_dc_ptr( hdc )))
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSelectPalette );
ret = dc->hPalette;
if (physdev->funcs->pSelectPalette( physdev, hpal, FALSE ))
{
dc->hPalette = hpal;
if (!wBkg) hPrimaryPalette = hpal;
}
else ret = 0;
release_dc_ptr( dc );
}
return ret;
}
/***********************************************************************
* GDIRealizePalette (Not a Windows API)
*/
UINT WINAPI GDIRealizePalette( HDC hdc )
{
UINT realized = 0;
DC* dc = get_dc_ptr( hdc );
if (!dc) return 0;
TRACE("%p...\n", hdc );
if( dc->hPalette == GetStockObject( DEFAULT_PALETTE ))
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pRealizeDefaultPalette );
realized = physdev->funcs->pRealizeDefaultPalette( physdev );
}
else if (InterlockedExchangePointer( (void **)&hLastRealizedPalette, dc->hPalette ) != dc->hPalette)
{
PHYSDEV physdev = GET_DC_PHYSDEV( dc, pRealizePalette );
PALETTEOBJ *palPtr = GDI_GetObjPtr( dc->hPalette, OBJ_PAL );
if (palPtr)
{
realized = physdev->funcs->pRealizePalette( physdev, dc->hPalette,
(dc->hPalette == hPrimaryPalette) );
palPtr->unrealize = physdev->funcs->pUnrealizePalette;
GDI_ReleaseObj( dc->hPalette );
}
}
else TRACE(" skipping (hLastRealizedPalette = %p)\n", hLastRealizedPalette);
release_dc_ptr( dc );
TRACE(" realized %i colors.\n", realized );
return realized;
}
/***********************************************************************
* SelectPalette [GDI32.@]
*
* Selects logical palette into DC.
*
* RETURNS
* Success: Previous logical palette
* Failure: NULL
*/
HPALETTE WINAPI SelectPalette(
HDC hDC, /* [in] Handle of device context */
HPALETTE hPal, /* [in] Handle of logical color palette */
BOOL bForceBackground) /* [in] Foreground/background mode */
{
return pfnSelectPalette( hDC, hPal, bForceBackground );
}
/***********************************************************************
* RealizePalette [GDI32.@]
*
* Maps palette entries to system palette.
*
* RETURNS
* Success: Number of entries in logical palette
* Failure: GDI_ERROR
*/
UINT WINAPI RealizePalette(
HDC hDC) /* [in] Handle of device context */
{
return pfnRealizePalette( hDC );
}
typedef HWND (WINAPI *WindowFromDC_funcptr)( HDC );
typedef BOOL (WINAPI *RedrawWindow_funcptr)( HWND, const RECT *, HRGN, UINT );
/**********************************************************************
* UpdateColors [GDI32.@]
*
* Remaps current colors to logical palette.
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*/
BOOL WINAPI UpdateColors(
HDC hDC) /* [in] Handle of device context */
{
HMODULE mod;
int size = GetDeviceCaps( hDC, SIZEPALETTE );
if (!size) return 0;
mod = GetModuleHandleA("user32.dll");
if (mod)
{
WindowFromDC_funcptr pWindowFromDC = (WindowFromDC_funcptr)GetProcAddress(mod,"WindowFromDC");
if (pWindowFromDC)
{
HWND hWnd = pWindowFromDC( hDC );
/* Docs say that we have to remap current drawable pixel by pixel
* but it would take forever given the speed of XGet/PutPixel.
*/
if (hWnd && size)
{
RedrawWindow_funcptr pRedrawWindow = (void *)GetProcAddress( mod, "RedrawWindow" );
if (pRedrawWindow) pRedrawWindow( hWnd, NULL, 0, RDW_INVALIDATE );
}
}
}
return 0x666;
}
/*********************************************************************
* SetMagicColors (GDI32.@)
*/
BOOL WINAPI SetMagicColors(HDC hdc, ULONG u1, ULONG u2)
{
FIXME("(%p 0x%08x 0x%08x): stub\n", hdc, u1, u2);
return TRUE;
}
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