/* * GDI bit-blit operations * * Copyright 1993, 1994 Alexandre Julliard * * 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 */ #include "config.h" #include #include #ifdef HAVE_FLOAT_H #include #endif #include "windef.h" #include "winbase.h" #include "wingdi.h" #include "gdi_private.h" #include "wine/debug.h" WINE_DEFAULT_DEBUG_CHANNEL(bitblt); static inline BOOL rop_uses_src( DWORD rop ) { return ((rop >> 2) & 0x330000) != (rop & 0x330000); } static inline void swap_ints( int *i, int *j ) { int tmp = *i; *i = *j; *j = tmp; } static inline BOOL intersect_rect( RECT *dst, const RECT *src1, const RECT *src2 ) { dst->left = max( src1->left, src2->left ); dst->top = max( src1->top, src2->top ); dst->right = min( src1->right, src2->right ); dst->bottom = min( src1->bottom, src2->bottom ); return (dst->left < dst->right && dst->top < dst->bottom); } static inline void offset_rect( RECT *rect, int offset_x, int offset_y ) { rect->left += offset_x; rect->top += offset_y; rect->right += offset_x; rect->bottom += offset_y; } static void get_vis_rectangles( DC *dc_dst, struct bitblt_coords *dst, DC *dc_src, struct bitblt_coords *src ) { RECT rect, clip; /* get the destination visible rectangle */ rect.left = dst->log_x; rect.top = dst->log_y; rect.right = dst->log_x + dst->log_width; rect.bottom = dst->log_y + dst->log_height; LPtoDP( dc_dst->hSelf, (POINT *)&rect, 2 ); dst->x = rect.left; dst->y = rect.top; dst->width = rect.right - rect.left; dst->height = rect.bottom - rect.top; if (dst->layout & LAYOUT_RTL && dst->layout & LAYOUT_BITMAPORIENTATIONPRESERVED) { swap_ints( &rect.left, &rect.right ); dst->x = rect.left; dst->width = rect.right - rect.left; } if (rect.left > rect.right) { swap_ints( &rect.left, &rect.right ); rect.left++; rect.right++; } if (rect.top > rect.bottom) { swap_ints( &rect.top, &rect.bottom ); rect.top++; rect.bottom++; } get_clip_box( dc_dst, &clip ); intersect_rect( &dst->visrect, &rect, &clip ); /* get the source visible rectangle */ if (!src) return; rect.left = src->log_x; rect.top = src->log_y; rect.right = src->log_x + src->log_width; rect.bottom = src->log_y + src->log_height; LPtoDP( dc_src->hSelf, (POINT *)&rect, 2 ); src->x = rect.left; src->y = rect.top; src->width = rect.right - rect.left; src->height = rect.bottom - rect.top; if (src->layout & LAYOUT_RTL && src->layout & LAYOUT_BITMAPORIENTATIONPRESERVED) { swap_ints( &rect.left, &rect.right ); src->x = rect.left; src->width = rect.right - rect.left; } if (rect.left > rect.right) { swap_ints( &rect.left, &rect.right ); rect.left++; rect.right++; } if (rect.top > rect.bottom) { swap_ints( &rect.top, &rect.bottom ); rect.top++; rect.bottom++; } /* source is not clipped */ if (dc_src->header.type == OBJ_MEMDC) intersect_rect( &src->visrect, &rect, &dc_src->vis_rect ); else src->visrect = rect; /* FIXME: clip to device size */ /* intersect the rectangles */ if ((src->width == dst->width) && (src->height == dst->height)) /* no stretching */ { offset_rect( &src->visrect, dst->x - src->x, dst->y - src->y ); intersect_rect( &rect, &src->visrect, &dst->visrect ); src->visrect = dst->visrect = rect; offset_rect( &src->visrect, src->x - dst->x, src->y - dst->y ); } else /* stretching */ { /* map source rectangle into destination coordinates */ rect.left = dst->x + (src->visrect.left - src->x)*dst->width/src->width; rect.top = dst->y + (src->visrect.top - src->y)*dst->height/src->height; rect.right = dst->x + (src->visrect.right - src->x)*dst->width/src->width; rect.bottom = dst->y + (src->visrect.bottom - src->y)*dst->height/src->height; if (rect.left > rect.right) swap_ints( &rect.left, &rect.right ); if (rect.top > rect.bottom) swap_ints( &rect.top, &rect.bottom ); /* avoid rounding errors */ rect.left--; rect.top--; rect.right++; rect.bottom++; if (!intersect_rect( &dst->visrect, &rect, &dst->visrect )) return; /* map destination rectangle back to source coordinates */ rect = dst->visrect; rect.left = src->x + (dst->visrect.left - dst->x)*src->width/dst->width; rect.top = src->y + (dst->visrect.top - dst->y)*src->height/dst->height; rect.right = src->x + (dst->visrect.right - dst->x)*src->width/dst->width; rect.bottom = src->y + (dst->visrect.bottom - dst->y)*src->height/dst->height; if (rect.left > rect.right) swap_ints( &rect.left, &rect.right ); if (rect.top > rect.bottom) swap_ints( &rect.top, &rect.bottom ); /* avoid rounding errors */ rect.left--; rect.top--; rect.right++; rect.bottom++; intersect_rect( &src->visrect, &rect, &src->visrect ); } } /* nulldrv fallback implementation using StretchDIBits */ BOOL CDECL nulldrv_StretchBlt( PHYSDEV dst_dev, struct bitblt_coords *dst, PHYSDEV src_dev, struct bitblt_coords *src, DWORD rop ) { DC *dc = get_nulldrv_dc( dst_dev ); BITMAP bm; BITMAPINFOHEADER info_hdr; HBITMAP hbm; LPVOID bits; INT lines; /* make sure we have a real implementation for StretchDIBits */ if (GET_DC_PHYSDEV( dc, pStretchDIBits ) == dst_dev) return 0; if (GetObjectType( src_dev->hdc ) != OBJ_MEMDC) return FALSE; if (!GetObjectW( GetCurrentObject( src_dev->hdc, OBJ_BITMAP ), sizeof(bm), &bm )) return FALSE; info_hdr.biSize = sizeof(info_hdr); info_hdr.biWidth = bm.bmWidth; info_hdr.biHeight = bm.bmHeight; info_hdr.biPlanes = 1; info_hdr.biBitCount = 32; info_hdr.biCompression = BI_RGB; info_hdr.biSizeImage = 0; info_hdr.biXPelsPerMeter = 0; info_hdr.biYPelsPerMeter = 0; info_hdr.biClrUsed = 0; info_hdr.biClrImportant = 0; if (!(bits = HeapAlloc(GetProcessHeap(), 0, bm.bmHeight * bm.bmWidth * 4))) return FALSE; /* Select out the src bitmap before calling GetDIBits */ hbm = SelectObject( src_dev->hdc, GetStockObject(DEFAULT_BITMAP) ); lines = GetDIBits( src_dev->hdc, hbm, 0, bm.bmHeight, bits, (BITMAPINFO*)&info_hdr, DIB_RGB_COLORS ); SelectObject( src_dev->hdc, hbm ); if (lines) lines = StretchDIBits( dst_dev->hdc, dst->log_x, dst->log_y, dst->log_width, dst->log_height, src->x, bm.bmHeight - src->height - src->y, src->width, src->height, bits, (BITMAPINFO*)&info_hdr, DIB_RGB_COLORS, rop ); HeapFree( GetProcessHeap(), 0, bits ); return (lines == src->height); } /*********************************************************************** * PatBlt (GDI32.@) */ BOOL WINAPI PatBlt( HDC hdc, INT left, INT top, INT width, INT height, DWORD rop) { DC * dc; BOOL bRet = FALSE; TRACE("%p %d,%d %dx%d %06x\n", hdc, left, top, width, height, rop ); if (rop_uses_src( rop )) return FALSE; if ((dc = get_dc_ptr( hdc ))) { PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPatBlt ); update_dc( dc ); bRet = physdev->funcs->pPatBlt( physdev, left, top, width, height, rop ); release_dc_ptr( dc ); } return bRet; } /*********************************************************************** * BitBlt (GDI32.@) */ BOOL WINAPI BitBlt( HDC hdcDst, INT xDst, INT yDst, INT width, INT height, HDC hdcSrc, INT xSrc, INT ySrc, DWORD rop ) { if (!rop_uses_src( rop )) return PatBlt( hdcDst, xDst, yDst, width, height, rop ); else return StretchBlt( hdcDst, xDst, yDst, width, height, hdcSrc, xSrc, ySrc, width, height, rop ); } /*********************************************************************** * StretchBlt (GDI32.@) */ BOOL WINAPI StretchBlt( HDC hdcDst, INT xDst, INT yDst, INT widthDst, INT heightDst, HDC hdcSrc, INT xSrc, INT ySrc, INT widthSrc, INT heightSrc, DWORD rop ) { BOOL ret = FALSE; DC *dcDst, *dcSrc; if (!rop_uses_src( rop )) return PatBlt( hdcDst, xDst, yDst, widthDst, heightDst, rop ); if (!(dcDst = get_dc_ptr( hdcDst ))) return FALSE; if ((dcSrc = get_dc_ptr( hdcSrc ))) { struct bitblt_coords src, dst; PHYSDEV src_dev = GET_DC_PHYSDEV( dcSrc, pStretchBlt ); PHYSDEV dst_dev = GET_DC_PHYSDEV( dcDst, pStretchBlt ); update_dc( dcSrc ); update_dc( dcDst ); src.log_x = xSrc; src.log_y = ySrc; src.log_width = widthSrc; src.log_height = heightSrc; src.layout = dcSrc->layout; dst.log_x = xDst; dst.log_y = yDst; dst.log_width = widthDst; dst.log_height = heightDst; dst.layout = dcDst->layout; if (rop & NOMIRRORBITMAP) { src.layout |= LAYOUT_BITMAPORIENTATIONPRESERVED; dst.layout |= LAYOUT_BITMAPORIENTATIONPRESERVED; rop &= ~NOMIRRORBITMAP; } get_vis_rectangles( dcDst, &dst, dcSrc, &src ); TRACE("src %p log=%d,%d %dx%d phys=%d,%d %dx%d vis=%s dst %p log=%d,%d %dx%d phys=%d,%d %dx%d vis=%s rop=%06x\n", hdcSrc, src.log_x, src.log_y, src.log_width, src.log_height, src.x, src.y, src.width, src.height, wine_dbgstr_rect(&src.visrect), hdcDst, dst.log_x, dst.log_y, dst.log_width, dst.log_height, dst.x, dst.y, dst.width, dst.height, wine_dbgstr_rect(&dst.visrect), rop ); ret = dst_dev->funcs->pStretchBlt( dst_dev, &dst, src_dev, &src, rop ); release_dc_ptr( dcSrc ); } release_dc_ptr( dcDst ); return ret; } #define FRGND_ROP3(ROP4) ((ROP4) & 0x00FFFFFF) #define BKGND_ROP3(ROP4) (ROP3Table[((ROP4)>>24) & 0xFF]) /*********************************************************************** * MaskBlt [GDI32.@] */ BOOL WINAPI MaskBlt(HDC hdcDest, INT nXDest, INT nYDest, INT nWidth, INT nHeight, HDC hdcSrc, INT nXSrc, INT nYSrc, HBITMAP hbmMask, INT xMask, INT yMask, DWORD dwRop) { HBITMAP hBitmap1, hOldBitmap1, hBitmap2, hOldBitmap2; HDC hDC1, hDC2; HBRUSH hbrMask, hbrDst, hbrTmp; static const DWORD ROP3Table[256] = { 0x00000042, 0x00010289, 0x00020C89, 0x000300AA, 0x00040C88, 0x000500A9, 0x00060865, 0x000702C5, 0x00080F08, 0x00090245, 0x000A0329, 0x000B0B2A, 0x000C0324, 0x000D0B25, 0x000E08A5, 0x000F0001, 0x00100C85, 0x001100A6, 0x00120868, 0x001302C8, 0x00140869, 0x001502C9, 0x00165CCA, 0x00171D54, 0x00180D59, 0x00191CC8, 0x001A06C5, 0x001B0768, 0x001C06CA, 0x001D0766, 0x001E01A5, 0x001F0385, 0x00200F09, 0x00210248, 0x00220326, 0x00230B24, 0x00240D55, 0x00251CC5, 0x002606C8, 0x00271868, 0x00280369, 0x002916CA, 0x002A0CC9, 0x002B1D58, 0x002C0784, 0x002D060A, 0x002E064A, 0x002F0E2A, 0x0030032A, 0x00310B28, 0x00320688, 0x00330008, 0x003406C4, 0x00351864, 0x003601A8, 0x00370388, 0x0038078A, 0x00390604, 0x003A0644, 0x003B0E24, 0x003C004A, 0x003D18A4, 0x003E1B24, 0x003F00EA, 0x00400F0A, 0x00410249, 0x00420D5D, 0x00431CC4, 0x00440328, 0x00450B29, 0x004606C6, 0x0047076A, 0x00480368, 0x004916C5, 0x004A0789, 0x004B0605, 0x004C0CC8, 0x004D1954, 0x004E0645, 0x004F0E25, 0x00500325, 0x00510B26, 0x005206C9, 0x00530764, 0x005408A9, 0x00550009, 0x005601A9, 0x00570389, 0x00580785, 0x00590609, 0x005A0049, 0x005B18A9, 0x005C0649, 0x005D0E29, 0x005E1B29, 0x005F00E9, 0x00600365, 0x006116C6, 0x00620786, 0x00630608, 0x00640788, 0x00650606, 0x00660046, 0x006718A8, 0x006858A6, 0x00690145, 0x006A01E9, 0x006B178A, 0x006C01E8, 0x006D1785, 0x006E1E28, 0x006F0C65, 0x00700CC5, 0x00711D5C, 0x00720648, 0x00730E28, 0x00740646, 0x00750E26, 0x00761B28, 0x007700E6, 0x007801E5, 0x00791786, 0x007A1E29, 0x007B0C68, 0x007C1E24, 0x007D0C69, 0x007E0955, 0x007F03C9, 0x008003E9, 0x00810975, 0x00820C49, 0x00831E04, 0x00840C48, 0x00851E05, 0x008617A6, 0x008701C5, 0x008800C6, 0x00891B08, 0x008A0E06, 0x008B0666, 0x008C0E08, 0x008D0668, 0x008E1D7C, 0x008F0CE5, 0x00900C45, 0x00911E08, 0x009217A9, 0x009301C4, 0x009417AA, 0x009501C9, 0x00960169, 0x0097588A, 0x00981888, 0x00990066, 0x009A0709, 0x009B07A8, 0x009C0704, 0x009D07A6, 0x009E16E6, 0x009F0345, 0x00A000C9, 0x00A11B05, 0x00A20E09, 0x00A30669, 0x00A41885, 0x00A50065, 0x00A60706, 0x00A707A5, 0x00A803A9, 0x00A90189, 0x00AA0029, 0x00AB0889, 0x00AC0744, 0x00AD06E9, 0x00AE0B06, 0x00AF0229, 0x00B00E05, 0x00B10665, 0x00B21974, 0x00B30CE8, 0x00B4070A, 0x00B507A9, 0x00B616E9, 0x00B70348, 0x00B8074A, 0x00B906E6, 0x00BA0B09, 0x00BB0226, 0x00BC1CE4, 0x00BD0D7D, 0x00BE0269, 0x00BF08C9, 0x00C000CA, 0x00C11B04, 0x00C21884, 0x00C3006A, 0x00C40E04, 0x00C50664, 0x00C60708, 0x00C707AA, 0x00C803A8, 0x00C90184, 0x00CA0749, 0x00CB06E4, 0x00CC0020, 0x00CD0888, 0x00CE0B08, 0x00CF0224, 0x00D00E0A, 0x00D1066A, 0x00D20705, 0x00D307A4, 0x00D41D78, 0x00D50CE9, 0x00D616EA, 0x00D70349, 0x00D80745, 0x00D906E8, 0x00DA1CE9, 0x00DB0D75, 0x00DC0B04, 0x00DD0228, 0x00DE0268, 0x00DF08C8, 0x00E003A5, 0x00E10185, 0x00E20746, 0x00E306EA, 0x00E40748, 0x00E506E5, 0x00E61CE8, 0x00E70D79, 0x00E81D74, 0x00E95CE6, 0x00EA02E9, 0x00EB0849, 0x00EC02E8, 0x00ED0848, 0x00EE0086, 0x00EF0A08, 0x00F00021, 0x00F10885, 0x00F20B05, 0x00F3022A, 0x00F40B0A, 0x00F50225, 0x00F60265, 0x00F708C5, 0x00F802E5, 0x00F90845, 0x00FA0089, 0x00FB0A09, 0x00FC008A, 0x00FD0A0A, 0x00FE02A9, 0x00FF0062, }; if (!hbmMask) return BitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, FRGND_ROP3(dwRop)); hbrMask = CreatePatternBrush(hbmMask); hbrDst = SelectObject(hdcDest, GetStockObject(NULL_BRUSH)); /* make bitmap */ hDC1 = CreateCompatibleDC(hdcDest); hBitmap1 = CreateCompatibleBitmap(hdcDest, nWidth, nHeight); hOldBitmap1 = SelectObject(hDC1, hBitmap1); /* draw using bkgnd rop */ BitBlt(hDC1, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, SRCCOPY); hbrTmp = SelectObject(hDC1, hbrDst); BitBlt(hDC1, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, BKGND_ROP3(dwRop)); SelectObject(hDC1, hbrTmp); /* make bitmap */ hDC2 = CreateCompatibleDC(hdcDest); hBitmap2 = CreateCompatibleBitmap(hdcDest, nWidth, nHeight); hOldBitmap2 = SelectObject(hDC2, hBitmap2); /* draw using foregnd rop */ BitBlt(hDC2, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, SRCCOPY); hbrTmp = SelectObject(hDC2, hbrDst); BitBlt(hDC2, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, FRGND_ROP3(dwRop)); /* combine both using the mask as a pattern brush */ SelectObject(hDC2, hbrMask); BitBlt(hDC2, 0, 0, nWidth, nHeight, hDC1, 0, 0, 0xac0744 ); /* (D & P) | (S & ~P) */ SelectObject(hDC2, hbrTmp); /* blit to dst */ BitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hDC2, 0, 0, SRCCOPY); /* restore all objects */ SelectObject(hdcDest, hbrDst); SelectObject(hDC1, hOldBitmap1); SelectObject(hDC2, hOldBitmap2); /* delete all temp objects */ DeleteObject(hBitmap1); DeleteObject(hBitmap2); DeleteObject(hbrMask); DeleteDC(hDC1); DeleteDC(hDC2); return TRUE; } /****************************************************************************** * GdiTransparentBlt [GDI32.@] */ BOOL WINAPI GdiTransparentBlt( HDC hdcDest, int xDest, int yDest, int widthDest, int heightDest, HDC hdcSrc, int xSrc, int ySrc, int widthSrc, int heightSrc, UINT crTransparent ) { BOOL ret = FALSE; HDC hdcWork; HBITMAP bmpWork; HGDIOBJ oldWork; HDC hdcMask = NULL; HBITMAP bmpMask = NULL; HBITMAP oldMask = NULL; COLORREF oldBackground; COLORREF oldForeground; int oldStretchMode; if(widthDest < 0 || heightDest < 0 || widthSrc < 0 || heightSrc < 0) { TRACE("Cannot mirror\n"); return FALSE; } oldBackground = SetBkColor(hdcDest, RGB(255,255,255)); oldForeground = SetTextColor(hdcDest, RGB(0,0,0)); /* Stretch bitmap */ oldStretchMode = GetStretchBltMode(hdcSrc); if(oldStretchMode == BLACKONWHITE || oldStretchMode == WHITEONBLACK) SetStretchBltMode(hdcSrc, COLORONCOLOR); hdcWork = CreateCompatibleDC(hdcDest); bmpWork = CreateCompatibleBitmap(hdcDest, widthDest, heightDest); oldWork = SelectObject(hdcWork, bmpWork); if(!StretchBlt(hdcWork, 0, 0, widthDest, heightDest, hdcSrc, xSrc, ySrc, widthSrc, heightSrc, SRCCOPY)) { TRACE("Failed to stretch\n"); goto error; } SetBkColor(hdcWork, crTransparent); /* Create mask */ hdcMask = CreateCompatibleDC(hdcDest); bmpMask = CreateCompatibleBitmap(hdcMask, widthDest, heightDest); oldMask = SelectObject(hdcMask, bmpMask); if(!BitBlt(hdcMask, 0, 0, widthDest, heightDest, hdcWork, 0, 0, SRCCOPY)) { TRACE("Failed to create mask\n"); goto error; } /* Replace transparent color with black */ SetBkColor(hdcWork, RGB(0,0,0)); SetTextColor(hdcWork, RGB(255,255,255)); if(!BitBlt(hdcWork, 0, 0, widthDest, heightDest, hdcMask, 0, 0, SRCAND)) { TRACE("Failed to mask out background\n"); goto error; } /* Replace non-transparent area on destination with black */ if(!BitBlt(hdcDest, xDest, yDest, widthDest, heightDest, hdcMask, 0, 0, SRCAND)) { TRACE("Failed to clear destination area\n"); goto error; } /* Draw the image */ if(!BitBlt(hdcDest, xDest, yDest, widthDest, heightDest, hdcWork, 0, 0, SRCPAINT)) { TRACE("Failed to paint image\n"); goto error; } ret = TRUE; error: SetStretchBltMode(hdcSrc, oldStretchMode); SetBkColor(hdcDest, oldBackground); SetTextColor(hdcDest, oldForeground); if(hdcWork) { SelectObject(hdcWork, oldWork); DeleteDC(hdcWork); } if(bmpWork) DeleteObject(bmpWork); if(hdcMask) { SelectObject(hdcMask, oldMask); DeleteDC(hdcMask); } if(bmpMask) DeleteObject(bmpMask); return ret; } /****************************************************************************** * GdiAlphaBlend [GDI32.@] */ BOOL WINAPI GdiAlphaBlend(HDC hdcDst, int xDst, int yDst, int widthDst, int heightDst, HDC hdcSrc, int xSrc, int ySrc, int widthSrc, int heightSrc, BLENDFUNCTION blendFunction) { BOOL ret = FALSE; DC *dcDst, *dcSrc; TRACE( "%p %d,%d %dx%d -> %p %d,%d %dx%d op=%02x flags=%02x srcconstalpha=%02x alphafmt=%02x\n", hdcSrc, xSrc, ySrc, widthSrc, heightSrc, hdcDst, xDst, yDst, widthDst, heightDst, blendFunction.BlendOp, blendFunction.BlendFlags, blendFunction.SourceConstantAlpha, blendFunction.AlphaFormat ); dcSrc = get_dc_ptr( hdcSrc ); if (!dcSrc) return FALSE; if ((dcDst = get_dc_ptr( hdcDst ))) { PHYSDEV src_dev = GET_DC_PHYSDEV( dcSrc, pAlphaBlend ); PHYSDEV dst_dev = GET_DC_PHYSDEV( dcDst, pAlphaBlend ); update_dc( dcSrc ); update_dc( dcDst ); ret = dst_dev->funcs->pAlphaBlend( dst_dev, xDst, yDst, widthDst, heightDst, src_dev, xSrc, ySrc, widthSrc, heightSrc, blendFunction ); release_dc_ptr( dcDst ); } release_dc_ptr( dcSrc ); return ret; } /********************************************************************* * PlgBlt [GDI32.@] * */ BOOL WINAPI PlgBlt( HDC hdcDest, const POINT *lpPoint, HDC hdcSrc, INT nXSrc, INT nYSrc, INT nWidth, INT nHeight, HBITMAP hbmMask, INT xMask, INT yMask) { int oldgMode; /* parallelogram coords */ POINT plg[3]; /* rect coords */ POINT rect[3]; XFORM xf; XFORM SrcXf; XFORM oldDestXf; double det; /* save actual mode, set GM_ADVANCED */ oldgMode = SetGraphicsMode(hdcDest,GM_ADVANCED); if (oldgMode == 0) return FALSE; memcpy(plg,lpPoint,sizeof(POINT)*3); rect[0].x = nXSrc; rect[0].y = nYSrc; rect[1].x = nXSrc + nWidth; rect[1].y = nYSrc; rect[2].x = nXSrc; rect[2].y = nYSrc + nHeight; /* calc XFORM matrix to transform hdcDest -> hdcSrc (parallelogram to rectangle) */ /* determinant */ det = rect[1].x*(rect[2].y - rect[0].y) - rect[2].x*(rect[1].y - rect[0].y) - rect[0].x*(rect[2].y - rect[1].y); if (fabs(det) < 1e-5) { SetGraphicsMode(hdcDest,oldgMode); return FALSE; } TRACE("hdcSrc=%p %d,%d,%dx%d -> hdcDest=%p %d,%d,%d,%d,%d,%d\n", hdcSrc, nXSrc, nYSrc, nWidth, nHeight, hdcDest, plg[0].x, plg[0].y, plg[1].x, plg[1].y, plg[2].x, plg[2].y); /* X components */ xf.eM11 = (plg[1].x*(rect[2].y - rect[0].y) - plg[2].x*(rect[1].y - rect[0].y) - plg[0].x*(rect[2].y - rect[1].y)) / det; xf.eM21 = (rect[1].x*(plg[2].x - plg[0].x) - rect[2].x*(plg[1].x - plg[0].x) - rect[0].x*(plg[2].x - plg[1].x)) / det; xf.eDx = (rect[0].x*(rect[1].y*plg[2].x - rect[2].y*plg[1].x) - rect[1].x*(rect[0].y*plg[2].x - rect[2].y*plg[0].x) + rect[2].x*(rect[0].y*plg[1].x - rect[1].y*plg[0].x) ) / det; /* Y components */ xf.eM12 = (plg[1].y*(rect[2].y - rect[0].y) - plg[2].y*(rect[1].y - rect[0].y) - plg[0].y*(rect[2].y - rect[1].y)) / det; xf.eM22 = (plg[1].x*(rect[2].y - rect[0].y) - plg[2].x*(rect[1].y - rect[0].y) - plg[0].x*(rect[2].y - rect[1].y)) / det; xf.eDy = (rect[0].x*(rect[1].y*plg[2].y - rect[2].y*plg[1].y) - rect[1].x*(rect[0].y*plg[2].y - rect[2].y*plg[0].y) + rect[2].x*(rect[0].y*plg[1].y - rect[1].y*plg[0].y) ) / det; GetWorldTransform(hdcSrc,&SrcXf); CombineTransform(&xf,&xf,&SrcXf); /* save actual dest transform */ GetWorldTransform(hdcDest,&oldDestXf); SetWorldTransform(hdcDest,&xf); /* now destination and source DCs use same coords */ MaskBlt(hdcDest,nXSrc,nYSrc,nWidth,nHeight, hdcSrc, nXSrc,nYSrc, hbmMask,xMask,yMask, SRCCOPY); /* restore dest DC */ SetWorldTransform(hdcDest,&oldDestXf); SetGraphicsMode(hdcDest,oldgMode); return TRUE; }