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List: freetype
Subject: [ft] ImageCache and SBitCache question
From: "Memory, Richard" <richard.memory () windriver ! com>
Date: 2005-07-22 1:06:40
Message-ID: FC51183DD7346347B77EEF5DC8655309012F3A03 () ala-mail04 ! corp ! ad ! wrs ! com
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Hi,
I'm using both the Image and Sbit caches and I have 2 questions. For
reference purposes, I am using Freetype 2.1.10. Most likely I'm simply
using the APIs incorrectly.
1) Using FTC_SBitCache_Lookup(), I haven't been able to find a way to
control the "render mode" (In fact, I'm not sure I'm correctly
interpreting the value of the FTC_Sbit->format field returned from the
call to FTC_SBitCache_Lookup).
I'd like to set the render mode to FT_RENDER_MODE_MONO, but I can't see
where to do this. I've tried setting the imageType.flags =
FT_RENDER_MODE_MONO, but this doesn't seem to have any effect. Instead,
it looks like I'm getting a bitmap in the 8 bit FT_PIXEL_MODE_GRAY
format (the sbit->format field has a value of 2), but I'm not sure.
Is there a way to set the render mode when using FTC_SBitCache_Lookup()?
Here is my code snippet:
imageType.face_id = (FTC_FaceID)&font;
imageType.width = 16;
imageType.height = 16;
imageType.flags = FT_RENDER_MODE_MONO;
if ((error = FTC_SBitCache_Lookup(sbitsCache, &imageType,
glyphIndex, &sbit, &node)) != 0)
{
printf("Error during sbit glyph lookup: 0x%x\n", error);
return(error);
}
2) Using FTC_ImageCache_Lookup(), I have not found a reliable way to
access the FT_GlyphSlotRec inside of the FT_FaceRec structure when I use
FTC_ImageCache_Lookup() API.
glyphIndex = FTC_CMapCache_Lookup(cmapCache, (FTC_FaceID)&font,
0, myText[i]);
if ((error = FTC_ImageCache_Lookup(imageCache, &imageType,
glyphIndex, &glyph, &node)) != 0)
{
printf("Error during image cache lookup: 0x%x\n", error);
return(error);
}
if ((error = FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_MONO, 0,
0)) != 0)
{
printf("Error during glyph to bitmap conversion: 0x%x\n",
error);
return(error);
}
glyphBitmap = (FT_BitmapGlyph)glyph;
hBearingY = font.face->glyph->metrics.horiBearingY;
The face is loaded by my "requester" function which isn't shown, but I'm
not sure the glyph is loaded into the "glyph slot" of the face when I
use FTC_ImageCache_Lookup().
Thanks,
Richard
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