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gdi32: Ignore the lfHeight value when it exceeds the limit.

This commit is contained in:
Akihiro Sagawa 2013-05-08 21:11:20 +09:00 committed by Alexandre Julliard
parent 87c028449f
commit 8f8363ede6
2 changed files with 69 additions and 1 deletions
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11
dlls/gdi32/freetype.c
View File

@ -3983,6 +3983,7 @@ static LONG calc_ppem_for_height(FT_Face ft_face, LONG height)
TT_HoriHeader *pHori;
LONG ppem;
const LONG MAX_PPEM = (1 << 16) - 1;
pOS2 = pFT_Get_Sfnt_Table(ft_face, ft_sfnt_os2);
pHori = pFT_Get_Sfnt_Table(ft_face, ft_sfnt_hhea);
@ -4010,9 +4011,17 @@ static LONG calc_ppem_for_height(FT_Face ft_face, LONG height)
else
ppem = MulDiv(ft_face->units_per_EM, height,
pOS2->usWinAscent + pOS2->usWinDescent);
if(ppem > MAX_PPEM) {
WARN("Ignoring too large height %d, ppem %d\n", height, ppem);
ppem = 1;
}
}
else
else if(height >= -MAX_PPEM)
ppem = -height;
else {
WARN("Ignoring too large height %d\n", height);
ppem = 1;
}
return ppem;
}

59
dlls/gdi32/tests/font.c
View File

@ -5028,6 +5028,64 @@ static void test_stock_fonts(void)
}
}
static void test_max_height(void)
{
HDC hdc;
LOGFONT lf;
HFONT hfont, hfont_old;
TEXTMETRICA tm1, tm;
BOOL r;
LONG invalid_height[] = { -65536, -123456, 123456 };
size_t i;
memset(&tm1, 0, sizeof(tm1));
memset(&lf, 0, sizeof(lf));
strcpy(lf.lfFaceName, "Tahoma");
lf.lfHeight = -1;
hdc = GetDC(NULL);
/* get 1 ppem value */
hfont = CreateFontIndirect(&lf);
hfont_old = SelectObject(hdc, hfont);
r = GetTextMetrics(hdc, &tm1);
ok(r, "GetTextMetrics failed\n");
ok(tm1.tmHeight > 0, "expected a positive value, got %d\n", tm1.tmHeight);
ok(tm1.tmAveCharWidth > 0, "expected a positive value, got %d\n", tm1.tmHeight);
DeleteObject(SelectObject(hdc, hfont_old));
/* test the largest value */
lf.lfHeight = -((1 << 16) - 1);
hfont = CreateFontIndirect(&lf);
hfont_old = SelectObject(hdc, hfont);
memset(&tm, 0, sizeof(tm));
r = GetTextMetrics(hdc, &tm);
ok(r, "GetTextMetrics failed\n");
ok(tm.tmHeight > tm1.tmHeight,
"expected greater than 1 ppem value (%d), got %d\n", tm1.tmHeight, tm.tmHeight);
ok(tm.tmAveCharWidth > tm1.tmAveCharWidth,
"expected greater than 1 ppem value (%d), got %d\n", tm1.tmAveCharWidth, tm.tmAveCharWidth);
DeleteObject(SelectObject(hdc, hfont_old));
/* test an invalid value */
for (i = 0; i < sizeof(invalid_height)/sizeof(invalid_height[0]); i++) {
lf.lfHeight = invalid_height[i];
hfont = CreateFontIndirect(&lf);
hfont_old = SelectObject(hdc, hfont);
memset(&tm, 0, sizeof(tm));
r = GetTextMetrics(hdc, &tm);
ok(r, "GetTextMetrics failed\n");
ok(tm.tmHeight == tm1.tmHeight,
"expected 1 ppem value (%d), got %d\n", tm1.tmHeight, tm.tmHeight);
ok(tm.tmAveCharWidth == tm1.tmAveCharWidth,
"expected 1 ppem value (%d), got %d\n", tm1.tmAveCharWidth, tm.tmAveCharWidth);
DeleteObject(SelectObject(hdc, hfont_old));
}
ReleaseDC(NULL, hdc);
return;
}
START_TEST(font)
{
init();
@ -5084,6 +5142,7 @@ START_TEST(font)
test_fullname();
test_fullname2();
test_east_asian_font_selection();
test_max_height();
/* These tests should be last test until RemoveFontResource
* is properly implemented.