From 6ef5b4485b9fe5a9d25d2d9b5e67f110fb728a8b Mon Sep 17 00:00:00 2001 From: Eskil Abrahamsen Blomfeldt Date: Mon, 23 Nov 2009 16:08:04 +0100 Subject: Fix positioning of diacritics in .otf fonts on Windows Since .otf fonts are not considered truetype fonts, they take the code paths intended for non-outline fonts. When calculating the bounding box of a glyph, this would mean we'd find the largest possible bounding rect of any glyph in the font, while the other metrics, such as the GPOS tables used to position diacritics in relation to base glyphs, are positioning the actual outline of the glyph. The result was that certain diacritics that depended on the opentype positioning would not be shown on Windows at all, as they would be positioned based on the wrong left bearing and height when drawn into the glyph cache. The fix is to find the tight bounding rect of the outline whenever possible and fall back to the old code when this fails. I've also added the left bearing of the glyph to the bounding box in the fallback case, as we did not respect this before and would misplace glyphs that has a bearing. Task-number: QTBUG-5860 Reviewed-by: Trond --- src/gui/text/qfontengine_win.cpp | 105 +++++++++++++++++++++++---------------- src/gui/text/qfontengine_win_p.h | 2 + 2 files changed, 63 insertions(+), 44 deletions(-) diff --git a/src/gui/text/qfontengine_win.cpp b/src/gui/text/qfontengine_win.cpp index 6c367ab..18851b7 100644 --- a/src/gui/text/qfontengine_win.cpp +++ b/src/gui/text/qfontengine_win.cpp @@ -485,61 +485,78 @@ glyph_metrics_t QFontEngineWin::boundingBox(const QGlyphLayout &glyphs) return glyph_metrics_t(0, -tm.tmAscent, w, tm.tmHeight, w, 0); } +bool QFontEngineWin::getOutlineMetrics(glyph_t glyph, const QTransform &t, glyph_metrics_t *metrics) const +{ + Q_ASSERT(metrics != 0); + + HDC hdc = shared_dc(); + + GLYPHMETRICS gm; + DWORD res = 0; + MAT2 mat; + mat.eM11.value = mat.eM22.value = 1; + mat.eM11.fract = mat.eM22.fract = 0; + mat.eM21.value = mat.eM12.value = 0; + mat.eM21.fract = mat.eM12.fract = 0; + + if (t.type() > QTransform::TxTranslate) { + // We need to set the transform using the HDC's world + // matrix rather than using the MAT2 above, because the + // results provided when transforming via MAT2 does not + // match the glyphs that are drawn using a WorldTransform + XFORM xform; + xform.eM11 = t.m11(); + xform.eM12 = t.m12(); + xform.eM21 = t.m21(); + xform.eM22 = t.m22(); + xform.eDx = 0; + xform.eDy = 0; + SetGraphicsMode(hdc, GM_ADVANCED); + SetWorldTransform(hdc, &xform); + } + + uint format = GGO_METRICS; + if (ttf) + format |= GGO_GLYPH_INDEX; + res = GetGlyphOutline(hdc, glyph, format, &gm, 0, 0, &mat); + + if (t.type() > QTransform::TxTranslate) { + XFORM xform; + xform.eM11 = xform.eM22 = 1; + xform.eM12 = xform.eM21 = xform.eDx = xform.eDy = 0; + SetWorldTransform(hdc, &xform); + SetGraphicsMode(hdc, GM_COMPATIBLE); + } + + if (res != GDI_ERROR) { + *metrics = glyph_metrics_t(gm.gmptGlyphOrigin.x, -gm.gmptGlyphOrigin.y, + (int)gm.gmBlackBoxX, (int)gm.gmBlackBoxY, gm.gmCellIncX, gm.gmCellIncY); + return true; + } else { + return false; + } +} glyph_metrics_t QFontEngineWin::boundingBox(glyph_t glyph, const QTransform &t) { #ifndef Q_WS_WINCE - GLYPHMETRICS gm; - HDC hdc = shared_dc(); SelectObject(hdc, hfont); - if (!ttf) { + + glyph_metrics_t glyphMetrics; + bool success = getOutlineMetrics(glyph, t, &glyphMetrics); + + if (!ttf && !success) { + // Bitmap fonts wchar_t ch = glyph; ABCFLOAT abc; GetCharABCWidthsFloat(hdc, ch, ch, &abc); int width = qRound(abc.abcfB); - return glyph_metrics_t(0, -tm.tmAscent, width, tm.tmHeight, width, 0).transformed(t); - } else { - DWORD res = 0; - MAT2 mat; - mat.eM11.value = mat.eM22.value = 1; - mat.eM11.fract = mat.eM22.fract = 0; - mat.eM21.value = mat.eM12.value = 0; - mat.eM21.fract = mat.eM12.fract = 0; - - if (t.type() > QTransform::TxTranslate) { - // We need to set the transform using the HDC's world - // matrix rather than using the MAT2 above, because the - // results provided when transforming via MAT2 does not - // match the glyphs that are drawn using a WorldTransform - XFORM xform; - xform.eM11 = t.m11(); - xform.eM12 = t.m12(); - xform.eM21 = t.m21(); - xform.eM22 = t.m22(); - xform.eDx = 0; - xform.eDy = 0; - SetGraphicsMode(hdc, GM_ADVANCED); - SetWorldTransform(hdc, &xform); - } - - res = GetGlyphOutline(hdc, glyph, GGO_METRICS | GGO_GLYPH_INDEX, &gm, 0, 0, &mat); - - if (t.type() > QTransform::TxTranslate) { - XFORM xform; - xform.eM11 = xform.eM22 = 1; - xform.eM12 = xform.eM21 = xform.eDx = xform.eDy = 0; - SetWorldTransform(hdc, &xform); - SetGraphicsMode(hdc, GM_COMPATIBLE); - } - - if (res != GDI_ERROR) { - return glyph_metrics_t(gm.gmptGlyphOrigin.x, -gm.gmptGlyphOrigin.y, - (int)gm.gmBlackBoxX, (int)gm.gmBlackBoxY, gm.gmCellIncX, gm.gmCellIncY); - } + return glyph_metrics_t(QFixed::fromReal(abc.abcfA), -tm.tmAscent, width, tm.tmHeight, width, 0).transformed(t); } - return glyph_metrics_t(); + + return glyphMetrics; #else HDC hdc = shared_dc(); HGDIOBJ oldFont = SelectObject(hdc, hfont); @@ -1135,7 +1152,7 @@ QNativeImage *QFontEngineWin::drawGDIGlyph(HFONT font, glyph_t glyph, int margin { ExtTextOut(hdc, -gx + margin, -gy + margin, options, 0, (LPCWSTR) &glyph, 1, 0); } - + SelectObject(hdc, old_font); return ni; } diff --git a/src/gui/text/qfontengine_win_p.h b/src/gui/text/qfontengine_win_p.h index 9c4b0a9..43e1f12 100644 --- a/src/gui/text/qfontengine_win_p.h +++ b/src/gui/text/qfontengine_win_p.h @@ -109,6 +109,8 @@ public: int getGlyphIndexes(const QChar *ch, int numChars, QGlyphLayout *glyphs, bool mirrored) const; void getCMap(); + bool getOutlineMetrics(glyph_t glyph, const QTransform &t, glyph_metrics_t *metrics) const; + QString _name; HFONT hfont; LOGFONT logfont; -- cgit v0.12