Re: [ft-devel] How to get the position of a glyph without rendering it

[Albert Astals Cid]

A Dimecres, 20 d'octubre de 2010, vàreu escriure:
> Hi,
> 
> On Wed, 20 Oct 2010 01:29:29 +0100
> 
> Albert Astals Cid <aa...@kde.org> wrote:
> >That code works fine for most of the fonts i tried but now i have
> >encountered a case in which
> >
> > round(-glyphMetrics->horiBearingX / 64.0);
> >
> >is -2 and
> >
> > -slot->bitmap_left;
> >
> >is 26
> 
> Could you tell me any sample fonts to reproduce
> this issue?
> 
> I think, the metric infos available before rendering
> come from metric tables, and the metric infos available
> after the rendering come from glyf table, so there
> can be incompatible values (rather, broken font may
> have different values).

Here some sample code and the font.

Any help more than welcome,
  Albert

> 
> Regards,
> mpsuzuki

#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_OUTLINE_H
#include FT_SIZES_H
#include FT_GLYPH_H

static void eerror(const char *msg, FT_Error e)
{
	printf("%s 0x%0x\n", msg, e);
	exit(1);
}

int main(int argc, char *argv[])
{
	FT_Face face;
	FT_Vector offset;
	FT_GlyphSlot slot;
	FT_UInt gid;
	FT_Matrix matrix;
	FT_Library lib;
	FT_Error e;

	if (e = FT_Init_FreeType(&lib))
		eerror("1", e);
	
	if (e = FT_New_Face(lib, "font.ttf", 0, &face))
		eerror("2", e);
	
	if (e = FT_New_Size(face, &face->size))
		eerror("3", e);
	
	if (e = FT_Set_Pixel_Sizes(face, 0, 28))
		eerror("6", e);
	
	matrix.xx = (FT_Fixed)(0);
	matrix.yx = (FT_Fixed)(65536);
	matrix.xy = (FT_Fixed)(-65536);
	matrix.yy = (FT_Fixed)(0);
	offset.x = 0;
	offset.y = 0;
	
	FT_Set_Transform(face, &matrix, &offset);
	slot = face->glyph;

	gid = (FT_UInt)45;

	if (e = FT_Load_Glyph(face, gid, FT_LOAD_NO_BITMAP))
		eerror("4", e);

	FT_Glyph_Metrics *glyphMetrics = &(face->glyph->metrics);
	int x = -glyphMetrics->horiBearingX / 64.0;
	int y = glyphMetrics->horiBearingY / 64.0;
	int w = glyphMetrics->width / 64.0;
	int h = glyphMetrics->height / 64.0;

	if (e = FT_Render_Glyph(slot, ft_render_mode_normal))
		eerror("5", e);

	int x2 = -slot->bitmap_left;
	int y2 = slot->bitmap_top;
	int w2 = slot->bitmap.width;
	int h2 = slot->bitmap.rows;
	
	printf("%d %d\n", x, x2);
	printf("%d %d\n", y, y2);
	printf("%d %d\n", w, w2);
	printf("%d %d\n", h, h2);
}

font.ttf
Description: application/font-ttf

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