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Commit 787ead80 authored by Huw Davies's avatar Huw Davies Committed by Alexandre Julliard
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gdi32: Use a modified version of MulDiv to match native behaviour.

parent 0ed10bf6
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Showing with 92 additions and 33 deletions
dlls/gdi32/metafile.c
View file @ 787ead80
......@@ -1222,6 +1222,26 @@ end:
return ret;
}
/*******************************************************************
* muldiv
*
* Behaves somewhat differently to MulDiv when the answer is -ve
* and also rounds n.5 towards zero
*/
static INT muldiv(INT m1, INT m2, INT d)
{
LONGLONG ret;
ret = ((LONGLONG)m1 * m2 + d/2) / d; /* Always add d/2 even if ret will be -ve */
if((LONGLONG)m1 * m2 * 2 == (2 * ret - 1) * d) /* If the answer is exactly n.5 round towards zero */
{
if(ret > 0) ret--;
else ret++;
}
return ret;
}
/******************************************************************
* set_window
*
......@@ -1247,28 +1267,28 @@ static BOOL set_window(HDC hdc, HENHMETAFILE emf, HDC ref_dc, INT map_mode)
case MM_TEXT:
case MM_ISOTROPIC:
case MM_ANISOTROPIC:
pt.y = MulDiv(header.rclFrame.top, vert_res, vert_size * 100);
pt.x = MulDiv(header.rclFrame.left, horz_res, horz_size * 100);
pt.y = muldiv(header.rclFrame.top, vert_res, vert_size * 100);
pt.x = muldiv(header.rclFrame.left, horz_res, horz_size * 100);
break;
case MM_LOMETRIC:
pt.y = MulDiv(-header.rclFrame.top, 1, 10) + 1;
pt.x = MulDiv( header.rclFrame.left, 1, 10);
pt.y = muldiv(-header.rclFrame.top, 1, 10) + 1;
pt.x = muldiv( header.rclFrame.left, 1, 10);
break;
case MM_HIMETRIC:
pt.y = -header.rclFrame.top + 1;
pt.x = header.rclFrame.left;
pt.x = (header.rclFrame.left >= 0) ? header.rclFrame.left : header.rclFrame.left + 1; /* See the tests */
break;
case MM_LOENGLISH:
pt.y = MulDiv(-header.rclFrame.top, 10, 254) + 1;
pt.x = MulDiv( header.rclFrame.left, 10, 254);
pt.y = muldiv(-header.rclFrame.top, 10, 254) + 1;
pt.x = muldiv( header.rclFrame.left, 10, 254);
break;
case MM_HIENGLISH:
pt.y = MulDiv(-header.rclFrame.top, 100, 254) + 1;
pt.x = MulDiv( header.rclFrame.left, 100, 254);
pt.y = muldiv(-header.rclFrame.top, 100, 254) + 1;
pt.x = muldiv( header.rclFrame.left, 100, 254);
break;
case MM_TWIPS:
pt.y = MulDiv(-header.rclFrame.top, 72 * 20, 2540) + 1;
pt.x = MulDiv( header.rclFrame.left, 72 * 20, 2540);
pt.y = muldiv(-header.rclFrame.top, 72 * 20, 2540) + 1;
pt.x = muldiv( header.rclFrame.left, 72 * 20, 2540);
break;
default:
WARN("Unknown map mode %d\n", map_mode);
......@@ -1276,8 +1296,8 @@ static BOOL set_window(HDC hdc, HENHMETAFILE emf, HDC ref_dc, INT map_mode)
}
SetWindowOrgEx(hdc, pt.x, pt.y, NULL);
pt.x = MulDiv(header.rclFrame.right - header.rclFrame.left, horz_res, horz_size * 100);
pt.y = MulDiv(header.rclFrame.bottom - header.rclFrame.top, vert_res, vert_size * 100);
pt.x = muldiv(header.rclFrame.right - header.rclFrame.left, horz_res, horz_size * 100);
pt.y = muldiv(header.rclFrame.bottom - header.rclFrame.top, vert_res, vert_size * 100);
SetWindowExtEx(hdc, pt.x, pt.y, NULL);
return TRUE;
}
......
dlls/gdi32/tests/metafile.c
View file @ 787ead80
......@@ -2308,11 +2308,25 @@ static void test_SetWinMetaFileBits(void)
HeapFree(GetProcessHeap(), 0, buffer);
}
static void getwinmetafilebits(UINT mode, int scale)
/* This is somewhat different to MulDiv, but appears to be how native behaves */
static INT muldiv(INT m1, INT m2, INT d)
{
LONGLONG ret;
ret = ((LONGLONG)m1 * m2 + d/2) / d; /* Always add d/2 even if ret will be -ve */
if((LONGLONG)m1 * m2 * 2 == (2 * ret - 1) * d) /* If the answer is exactly n.5 round towards zero */
{
if(ret > 0) ret--;
else ret++;
}
return ret;
}
static void getwinmetafilebits(UINT mode, int scale, RECT *rc)
{
HENHMETAFILE emf;
HDC display_dc, emf_dc;
RECT rc;
ENHMETAHEADER *enh_header;
UINT size, emf_size, i;
WORD check = 0;
......@@ -2322,17 +2336,19 @@ static void getwinmetafilebits(UINT mode, int scale)
INT horz_res, vert_res, horz_size, vert_size;
display_dc = GetDC(NULL);
ok(display_dc != NULL, "display_dc is NULL\n");
horz_res = GetDeviceCaps(display_dc, HORZRES);
vert_res = GetDeviceCaps(display_dc, VERTRES);
horz_size = GetDeviceCaps(display_dc, HORZSIZE);
vert_size = GetDeviceCaps(display_dc, VERTSIZE);
SetRect(&rc, 1000, 2000, 3000, 6000);
emf_dc = CreateEnhMetaFileA(display_dc, NULL, &rc, NULL);
emf_dc = CreateEnhMetaFileA(display_dc, NULL, rc, NULL);
ok(emf_dc != NULL, "emf_dc is NULL\n");
for(i = 0; i < 3000; i++) /* This is enough to take emf_size > 0xffff */
Rectangle(emf_dc, 0, 0, 1000, 20);
emf = CloseEnhMetaFile(emf_dc);
ok(emf != NULL, "emf is NULL\n");
emf_size = GetEnhMetaFileBits(emf, 0, NULL);
enh_header = HeapAlloc(GetProcessHeap(), 0, emf_size);
......@@ -2342,6 +2358,8 @@ static void getwinmetafilebits(UINT mode, int scale)
have different resolutions */
enh_header->szlDevice.cx *= scale;
emf = SetEnhMetaFileBits(emf_size, (BYTE*)enh_header);
ok(emf != NULL, "emf is NULL\n");
ok(EqualRect((RECT*)&enh_header->rclFrame, rc), "Frame rectangles differ\n");
size = GetWinMetaFileBits(emf, 0, NULL, mode, display_dc);
ok(size, "GetWinMetaFileBits returns 0\n");
......@@ -2403,28 +2421,28 @@ static void getwinmetafilebits(UINT mode, int scale)
case MM_TEXT:
case MM_ISOTROPIC:
case MM_ANISOTROPIC:
pt.y = MulDiv(rc.top, vert_res, vert_size * 100);
pt.x = MulDiv(rc.left, horz_res, horz_size * 100);
pt.y = muldiv(rc->top, vert_res, vert_size * 100);
pt.x = muldiv(rc->left, horz_res, horz_size * 100);
break;
case MM_LOMETRIC:
pt.y = MulDiv(-rc.top, 1, 10) + 1;
pt.x = MulDiv(rc.left, 1, 10);
pt.y = muldiv(-rc->top, 1, 10) + 1;
pt.x = muldiv( rc->left, 1, 10);
break;
case MM_HIMETRIC:
pt.y = -rc.top + 1;
pt.x = rc.left;
pt.y = -rc->top + 1;
pt.x = (rc->left >= 0) ? rc->left : rc->left + 1; /* strange but true */
break;
case MM_LOENGLISH:
pt.y = MulDiv(-rc.top, 10, 254) + 1;
pt.x = MulDiv( rc.left, 10, 254);
pt.y = muldiv(-rc->top, 10, 254) + 1;
pt.x = muldiv( rc->left, 10, 254);
break;
case MM_HIENGLISH:
pt.y = MulDiv(-rc.top, 100, 254) + 1;
pt.x = MulDiv( rc.left, 100, 254);
pt.y = muldiv(-rc->top, 100, 254) + 1;
pt.x = muldiv( rc->left, 100, 254);
break;
case MM_TWIPS:
pt.y = MulDiv(-rc.top, 72 * 20, 2540) + 1;
pt.x = MulDiv( rc.left, 72 * 20, 2540);
pt.y = muldiv(-rc->top, 72 * 20, 2540) + 1;
pt.x = muldiv( rc->left, 72 * 20, 2540);
break;
default:
pt.x = pt.y = 0;
......@@ -2437,8 +2455,9 @@ static void getwinmetafilebits(UINT mode, int scale)
if(rec_num == mfcomment_chunks + 2)
{
ok(rec->rdFunction == META_SETWINDOWEXT, "got %04x\n", rec->rdFunction);
ok((short)rec->rdParm[0] == MulDiv(rc.bottom - rc.top, vert_res, vert_size * 100), "got %d\n", (short)rec->rdParm[0]);
ok((short)rec->rdParm[1] == MulDiv(rc.right - rc.left, horz_res, horz_size * 100), "got %d\n", (short)rec->rdParm[1]);
ok((short)rec->rdParm[0] == muldiv(rc->bottom - rc->top, vert_res, vert_size * 100), "got %d\n", (short)rec->rdParm[0]);
ok((short)rec->rdParm[1] == muldiv(rc->right - rc->left, horz_res, horz_size * 100), "got %d\n", (short)rec->rdParm[1]);
}
rec_num++;
......@@ -2455,11 +2474,31 @@ static void getwinmetafilebits(UINT mode, int scale)
static void test_GetWinMetaFileBits(void)
{
UINT mode;
RECT frames[] =
{
{ 1000, 2000, 3000, 6000},
{-1000, 2000, 3000, 6000},
{ 1000, -2000, 3000, 6000},
{ 1005, 2005, 3000, 6000},
{-1005, -2005, 3000, 6000},
{-1005, -2010, 3000, 6000},
{-1005, 2010, 3000, 6000},
{ 0, 0, 1, 1},
{ -1, -1, 1, 1},
{ 0, 0, 0, 0}
};
for(mode = MM_MIN; mode <= MM_MAX; mode++)
{
getwinmetafilebits(mode, 1);
getwinmetafilebits(mode, 2);
RECT *rc;
trace("mode %d\n", mode);
for(rc = frames; rc->right - rc->left > 0; rc++)
{
trace("frame %d,%d - %d,%d\n", rc->left, rc->top, rc->right, rc->bottom);
getwinmetafilebits(mode, 1, rc);
getwinmetafilebits(mode, 2, rc);
}
}
}
......
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