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Implemented the multiline stuff on Windows. Oh boy this is so broken everywhere...

This commit is contained in:
Pietro Gagliardi 2016-01-16 16:42:33 -05:00
parent b0621a6b1f
commit eb6e10350d
1 changed files with 40 additions and 1 deletions
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41
windows/drawtext.cpp
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@ -277,6 +277,7 @@ void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc
// - http://xboxforums.create.msdn.com/forums/t/109445.aspx
// - https://msdn.microsoft.com/en-us/library/dd183564%28v=vs.85%29.aspx
// - http://www.fontbureau.com/blog/the-em/
// TODO make points here about how DIPs in DirectWrite == DIPs in Direct2D; if not, figure out what they really are? for the width and layout functions later
static double scaleUnits(double what, double designUnitsPerEm, double size)
{
return (what / designUnitsPerEm) * (size * (96.0 / 72.0));
@ -356,7 +357,7 @@ static intmax_t *toUTF16Offsets(const char *str, WCHAR **wstr, intmax_t *wlenout
return bytesToCharacters;
}
uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont)
uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
{
uiDrawTextLayout *layout;
WCHAR *wtext;
@ -392,6 +393,8 @@ uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultF
logHRESULT("error creating IDWriteTextLayout in uiDrawNewTextLayout()", hr);
uiFree(wtext);
uiDrawTextLayoutSetWidth(layout, width);
return layout;
}
@ -402,6 +405,42 @@ void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
uiFree(layout);
}
void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
{
DWRITE_WORD_WRAPPING wrap;
FLOAT maxWidth;
HRESULT hr;
// this is the only wrapping mode (apart from "no wrap") available prior to Windows 8.1
wrap = DWRITE_WORD_WRAPPING_WRAP;
maxWidth = width;
if (width < 0) {
wrap = DWRITE_WORD_WRAPPING_NO_WRAP;
// setting the max width in this case technically isn't needed since the wrap mode will simply ignore the max width, but let's do it just to be safe
maxWidth = FLT_MAX; // see TODO above
}
hr = layout->layout->SetWordWrapping(wrap);
if (hr != S_OK)
logHRESULT("error setting word wrapping mode in uiDrawTextLayoutSetWidth()", hr);
hr = layout->layout->SetMaxWidth(maxWidth);
if (hr != S_OK)
logHRESULT("error setting max layout width in uiDrawTextLayoutSetWidth()", hr);
}
// TODO for a single line the height is always taller than ascent + descent
void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height)
{
DWRITE_TEXT_METRICS metrics;
HRESULT hr;
hr = layout->layout->GetMetrics(&metrics);
if (hr != S_OK)
logHRESULT("error getting layout metrics in uiDrawTextLayoutExtents()", hr);
*width = metrics.width;
// TODO make sure the behavior of this on empty strings is the same on all platforms
*height = metrics.height;
}
void doDrawText(ID2D1RenderTarget *rt, ID2D1Brush *black, double x, double y, uiDrawTextLayout *layout)
{
D2D1_POINT_2F pt;