[reactos] 01/01: [WIN32SS][NTGDI] Don't use FLOAT in ftGdiGetGlyphOutline (#1576)

[Katayama Hirofumi MZ]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=86046a9bf4af575513083…

commit 86046a9bf4af57551308331631447c7ccfa87fe9
Author:     Katayama Hirofumi MZ <katayama.hirofumi.mz(a)gmail.com>
AuthorDate: Mon May 27 18:35:43 2019 +0900
Commit:     GitHub <noreply(a)github.com>
CommitDate: Mon May 27 18:35:43 2019 +0900

    [WIN32SS][NTGDI] Don't use FLOAT in ftGdiGetGlyphOutline (#1576)
    
    Don't use FLOAT variable in ftGdiGetGlyphOutline function. CORE-15838
---
 win32ss/gdi/ntgdi/freetype.c | 61 +++++++++++++++++++++++++-------------------
 1 file changed, 35 insertions(+), 26 deletions(-)

diff --git a/win32ss/gdi/ntgdi/freetype.c b/win32ss/gdi/ntgdi/freetype.c
index 94c1413071..3b65327071 100644
--- a/win32ss/gdi/ntgdi/freetype.c
+++ b/win32ss/gdi/ntgdi/freetype.c
@@ -347,18 +347,6 @@ static __inline void FTVectorToPOINTFX(FT_Vector *vec, POINTFX *pt)
     pt->y.fract |= ((pt->y.fract >> 6) | (pt->y.fract >> 12));
 }
 
-/*
-   This function builds an FT_Fixed from a float. It puts the integer part
-   in the highest 16 bits and the decimal part in the lowest 16 bits of the FT_Fixed.
-   It fails if the integer part of the float number is greater than SHORT_MAX.
-*/
-static __inline FT_Fixed FT_FixedFromFloat(FLOAT f)
-{
-    short value = f;
-    unsigned short fract = (f - value) * 0xFFFF;
-    return (FT_Fixed)((long)value << 16 | (unsigned long)fract);
-}
-
 /*
    This function builds an FT_Fixed from a FIXED. It simply put f.value
    in the highest 16 bits and f.fract in the lowest 16 bits of the FT_Fixed.
@@ -3479,14 +3467,15 @@ ftGdiGetGlyphOutline(
     FT_Error error;
     INT left, right, top = 0, bottom = 0;
     FT_Int load_flags = FT_LOAD_DEFAULT | FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH;
-    FLOAT eM11, widthRatio = 1.0;
+    FLOATOBJ eM11, widthRatio, eTemp;
     FT_Matrix transMat = identityMat;
     BOOL needsTransform = FALSE;
     INT orientation;
     LONG aveWidth;
     INT adv, lsb, bbx; /* These three hold to widths of the unrotated chars */
     OUTLINETEXTMETRICW *potm;
-    XFORM xForm;
+    XFORMOBJ xo;
+    XFORML xform;
     LOGFONTW *plf;
 
     DPRINT("%u, %08x, %p, %08lx, %p, %p\n", wch, iFormat, pgm,
@@ -3494,8 +3483,9 @@ ftGdiGetGlyphOutline(
 
     pdcattr = dc->pdcattr;
 
-    MatrixS2XForm(&xForm, &dc->pdcattr->mxWorldToDevice);
-    eM11 = xForm.eM11;
+    XFORMOBJ_vInit(&xo, &dc->pdcattr->mxWorldToDevice);
+    XFORMOBJ_iGetXform(&xo, &xform);
+    FLOATOBJ_SetFloat(&eM11, xform.eM11);
 
     hFont = pdcattr->hlfntNew;
     TextObj = RealizeFontInit(hFont);
@@ -3557,17 +3547,33 @@ ftGdiGetGlyphOutline(
     }
     IntUnLockFreeType();
 
+    FLOATOBJ_Set1(&widthRatio);
     if (aveWidth && potm)
     {
-        widthRatio = (FLOAT)aveWidth * eM11 /
-                     (FLOAT)potm->otmTextMetrics.tmAveCharWidth;
+        // widthRatio = aveWidth * eM11 / potm->otmTextMetrics.tmAveCharWidth
+        FLOATOBJ_SetLong(&widthRatio, aveWidth);
+        FLOATOBJ_Mul(&widthRatio, &eM11);
+        FLOATOBJ_DivLong(&widthRatio, potm->otmTextMetrics.tmAveCharWidth);
     }
 
-    left = (INT)(ft_face->glyph->metrics.horiBearingX * widthRatio) & -64;
-    right = (INT)((ft_face->glyph->metrics.horiBearingX +
-                   ft_face->glyph->metrics.width) * widthRatio + 63) & -64;
+    //left = (INT)(ft_face->glyph->metrics.horiBearingX * widthRatio) & -64;
+    FLOATOBJ_SetLong(&eTemp, ft_face->glyph->metrics.horiBearingX);
+    FLOATOBJ_Mul(&eTemp, &widthRatio);
+    left = FLOATOBJ_GetLong(&eTemp) & -64;
+
+    //right = (INT)((ft_face->glyph->metrics.horiBearingX +
+    //               ft_face->glyph->metrics.width) * widthRatio + 63) & -64;
+    FLOATOBJ_SetLong(&eTemp, ft_face->glyph->metrics.horiBearingX *
ft_face->glyph->metrics.width);
+    FLOATOBJ_Mul(&eTemp, &widthRatio);
+    FLOATOBJ_AddLong(&eTemp, 63);
+    right = FLOATOBJ_GetLong(&eTemp) & -64;
+
+    //adv = (INT)((ft_face->glyph->metrics.horiAdvance * widthRatio) + 63) >>
6;
+    FLOATOBJ_SetLong(&eTemp, ft_face->glyph->metrics.horiAdvance);
+    FLOATOBJ_Mul(&eTemp, &widthRatio);
+    FLOATOBJ_AddLong(&eTemp, 63);
+    adv = FLOATOBJ_GetLong(&eTemp) >> 6;
 
-    adv = (INT)((ft_face->glyph->metrics.horiAdvance * widthRatio) + 63) >>
6;
     lsb = left >> 6;
     bbx = (right - left) >> 6;
 
@@ -3576,14 +3582,17 @@ ftGdiGetGlyphOutline(
     IntLockFreeType();
 
     /* Width scaling transform */
-    if (widthRatio != 1.0)
+    if (!FLOATOBJ_Equal1(&widthRatio))
     {
         FT_Matrix scaleMat;
-        scaleMat.xx = FT_FixedFromFloat(widthRatio);
+
+        eTemp = widthRatio;
+        FLOATOBJ_MulLong(&eTemp, 1 << 16);
+
+        scaleMat.xx = FLOATOBJ_GetLong(&eTemp);
         scaleMat.xy = 0;
         scaleMat.yx = 0;
-        scaleMat.yy = FT_FixedFromFloat(1.0);
-
+        scaleMat.yy = INT_TO_FIXED(1);
         FT_Matrix_Multiply(&scaleMat, &transMat);
         needsTransform = TRUE;
     }