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Subject: |
[ft-devel] fitting a text |
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Date: |
Fri, 5 Jun 2015 11:24:12 +0200 |
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User-agent: |
Mutt/1.5.23 (2014-03-12) |
Hi,
I'm trying to draw text to a bitmap. It should fit the height of the
bitmap and the width can be extended whenever required.
Getting the width right works fine but the height is a problem: a, b, c
fit nicely but g, q and _ fall below the bottom. How can I get this to
work?
My code is:
int target_height = 50; // height of bitmap
FT_Library library;
FT_Face face;
(void)FT_Init_FreeType(&library);
(void)FT_New_Face(library, filename.c_str(), 0, &face);
(void)FT_Set_Char_Size(face, target_height * 64, 0, 100, 0); /* set
character size */
FT_GlyphSlot slot = face->glyph;
w = 0;
h = target_height;
// calculate resulting width
for(int n = 0; n < text.size(); n++)
{
if (FT_Load_Char(face, text.at(n), FT_LOAD_RENDER))
continue;
w += slot->advance.x / 64;
}
// draw text to bitmap
image = new uint8_t[w * h];
memset(image, 0x00, w * h);
double x = 0.0;
for(int n = 0; n < text.size(); n++)
{
if (FT_Load_Char(face, text.at(n), FT_LOAD_RENDER))
continue;
draw_bitmap(w, h, &slot->bitmap, slot->bitmap_left + int(x /
64.0), target_height - slot->bitmap_top - slot->advance.y);
x += slot->advance.x;
}
FT_Done_Face(face);
FT_Done_FreeType(library);
draw bitmap:
// x_offset is the 'x' from the code above that gets the slot->advance.x
added to it for every character
// x,y here just iterate from 0 to slot->bitmap.width and .height
int y_offset = target_height - slot->bitmap_top - slot->advance.y;
image[(y + y_offset) * image_width + x + x_offset] = slot->bitmap.buffer[y
* slot->bitmap.width + x];
Folkert van Heusden
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