adding a new glyph viewer program to better understand the
hinting errors note: depends on Nirvana, which is not publicly available !!
This commit is contained in:
David Turner
parent
2c454d29cf
commit
9f781c410b
4
Jamfile
4
Jamfile
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@ -38,4 +38,8 @@ HDRMACRO [ FT2_SubDir include freetype internal internal.h ] ;
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SubInclude FT2_TOP src ;
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# tests files
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#
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SubInclude FT2_TOP tests ;
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# end of top Jamfile
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@ -0,0 +1,31 @@
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SubDir FT2_TOP tests ;
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test_programs = gview ;
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SubDirHdrs [ FT2_SubDir .. .. nirvana include ] ;
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NV_TOP = [ FT2_SubDir .. .. .. nirvana ] ;
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NIRVANA_LINKLIBS = $(NV_TOP)\\objs\\nirvana$(SUFLIB) ;
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{
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local t ;
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for t in $(test_programs)
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{
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Main $(t) : $(t).c ;
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LinkLibraries $(t) : $(FT2_LIB) ;
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if $(TOOLSET) = MINGW
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{
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LINKKLIBS on $(t)$(SUFEXE) = "-luser32 -lgdi32" ;
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}
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else
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{
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LINKLIBS on $(t)$(SUFEXE) = user32.lib gdi32.lib ;
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}
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NEEDLIBS on $(t)$(SUFEXE) += $(NIRVANA_LINKLIBS) ;
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}
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}
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@ -0,0 +1,436 @@
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#include <nirvana.h>
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#include NV_VIEWPORT_H
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#include <stdio.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include <time.h> /* for clock() */
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/* SunOS 4.1.* does not define CLOCKS_PER_SEC, so include <sys/param.h> */
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/* to get the HZ macro which is the equivalent. */
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#if defined(__sun__) && !defined(SVR4) && !defined(__SVR4)
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#include <sys/param.h>
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#define CLOCKS_PER_SEC HZ
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#endif
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static int depth = 0;
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static NV_Renderer renderer;
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static NV_Painter painter;
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static NV_Pixmap target;
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static NV_Error error;
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static NV_Memory memory;
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static NVV_Display display;
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static NVV_Surface surface;
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static FT_Library freetype;
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static FT_Face face;
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static NV_Pos glyph_scale;
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static NV_Pos glyph_org_x;
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static NV_Pos glyph_org_y;
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static NV_Transform glyph_transform; /* font units -> device pixels */
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static NV_Transform size_transform; /* subpixels -> device pixels */
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static NV_Scale grid_scale = 1.0;
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static int glyph_index;
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static int pixel_size = 12;
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static int option_show_axis = 1;
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static int option_show_dots = 1;
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static int option_show_stroke = 1;
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static int option_show_glyph = 1;
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static int option_show_grid = 1;
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static int option_show_em = 0;
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static int option_hinting = 1;
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#define AXIS_COLOR 0xFFFF0000
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#define GRID_COLOR 0xFFD0D0D0
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#define ON_COLOR 0xFFFF2000
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#define OFF_COLOR 0xFFFF0080
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#define BACKGROUND_COLOR 0xFFFFFFFF
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#define TEXT_COLOR 0xFF000000
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#define EM_COLOR 0x80008000
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/* print message and abort program */
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static void
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Panic( const char* message )
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{
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fprintf( stderr, "PANIC: %s\n", message );
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exit(1);
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}
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static void
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reset_scale( NV_Scale scale )
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{
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/* compute font units -> grid pixels scale factor */
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glyph_scale = target->width*0.75 / face->units_per_EM * scale;
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/* setup font units -> grid pixels transform */
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nv_transform_set_scale( &glyph_transform, glyph_scale, -glyph_scale );
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glyph_org_x = glyph_transform.delta.x = target->width*0.125;
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glyph_org_y = glyph_transform.delta.y = target->height*0.875;
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/* setup subpixels -> grid pixels transform */
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nv_transform_set_scale( &size_transform,
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glyph_scale/nv_fromfixed(face->size->metrics.x_scale),
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- glyph_scale/nv_fromfixed(face->size->metrics.y_scale) );
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size_transform.delta = glyph_transform.delta;
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}
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static void
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reset_size( int pixel_size, NV_Scale scale )
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{
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FT_Set_Pixel_Sizes( face, pixel_size, pixel_size );
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reset_scale( scale );
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}
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static void
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clear_background( void )
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{
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nv_pixmap_fill_rect( target, 0, 0, target->width, target->height,
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BACKGROUND_COLOR );
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}
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static void
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draw_grid( void )
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{
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int x = (int)glyph_org_x;
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int y = (int)glyph_org_y;
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/* draw grid */
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if ( option_show_grid )
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{
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NV_Scale min, max, x, step;
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/* draw vertical grid bars */
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step = 64. * size_transform.matrix.xx;
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if (step > 1.)
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{
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min = max = glyph_org_x;
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while ( min - step >= 0 ) min -= step;
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while ( max + step < target->width ) max += step;
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for ( x = min; x <= max; x += step )
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nv_pixmap_fill_rect( target, (NV_Int)(x+.5), 0,
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1, target->height, GRID_COLOR );
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}
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/* draw horizontal grid bars */
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step = -64. * size_transform.matrix.yy;
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if (step > 1.)
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{
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min = max = glyph_org_y;
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while ( min - step >= 0 ) min -= step;
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while ( max + step < target->height ) max += step;
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for ( x = min; x <= max; x += step )
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nv_pixmap_fill_rect( target, 0, (NV_Int)(x+.5),
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target->width, 1, GRID_COLOR );
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}
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}
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/* draw axis */
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if ( option_show_axis )
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{
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nv_pixmap_fill_rect( target, x, 0, 1, target->height, AXIS_COLOR );
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nv_pixmap_fill_rect( target, 0, y, target->width, 1, AXIS_COLOR );
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}
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if ( option_show_em )
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{
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NV_Path path;
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NV_Path stroke;
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NV_UInt units = (NV_UInt)face->units_per_EM;
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nv_path_new_rectangle( renderer, 0, 0, units, units, 0, 0, &path );
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nv_path_transform( path, &glyph_transform );
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nv_path_stroke( path, 1.5, nv_path_linecap_butt, nv_path_linejoin_miter,
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4.0, &stroke );
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nv_painter_set_color( painter, EM_COLOR, 256 );
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nv_painter_fill_path( painter, NULL, 0, stroke );
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nv_path_destroy( stroke );
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nv_path_destroy( path );
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}
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}
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static void
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draw_glyph( int glyph_index )
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{
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NV_Path path;
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NV_Scale scale;
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error = FT_Load_Glyph( face, glyph_index, option_hinting
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? FT_LOAD_NO_BITMAP
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: FT_LOAD_NO_BITMAP | FT_LOAD_NO_HINTING );
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if (error) Panic( "could not load glyph" );
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if ( face->glyph->format != ft_glyph_format_outline )
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Panic( "could not load glyph outline" );
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error = nv_path_new_from_outline( renderer,
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(NV_Outline*)&face->glyph->outline,
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&size_transform,
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&path );
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if (error) Panic( "could not create glyph path" );
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/* tracé du glyphe plein */
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if ( option_show_glyph )
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{
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nv_painter_set_color ( painter, 0xFF404080, 128 );
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nv_painter_fill_path ( painter, 0, 0, path );
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}
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if ( option_show_stroke )
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{
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NV_Path stroke;
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error = nv_path_stroke( path, 0.6,
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nv_path_linecap_butt,
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nv_path_linejoin_miter,
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1.0, &stroke );
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if (error) Panic( "could not stroke glyph path" );
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nv_painter_set_color ( painter, 0xFF000040, 256 );
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nv_painter_fill_path ( painter, 0, 0, stroke );
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nv_path_destroy( stroke );
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}
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/* tracé des points de controle */
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if ( option_show_dots )
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{
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NV_Path plot;
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NV_Outline out;
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NV_Scale r = 2;
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NV_Int n, first, last;
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nv_path_new_circle( renderer, 0, 0, 2., &plot );
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nv_path_get_outline( path, NULL, memory, &out );
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first = 0;
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for ( n = 0; n < out.n_contours; n++ )
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{
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int m;
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NV_Transform trans;
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NV_Color color;
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NV_SubVector* vec;
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last = out.contours[n];
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for ( m = first; m <= last; m++ )
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{
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color = (out.tags[m] & FT_Curve_Tag_On)
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? ON_COLOR
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: OFF_COLOR;
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vec = out.points + m;
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nv_transform_set_translate( &trans, vec->x/64.0, vec->y/64.0 );
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nv_painter_set_color( painter, color, 256 );
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nv_painter_fill_path( painter, &trans, 0, plot );
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}
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first = last + 1;
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}
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nv_path_destroy( plot );
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}
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nv_path_destroy( path );
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/* autre infos */
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{
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char temp[1024];
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char temp2[64];
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sprintf( temp, "font name : %s (%s)", face->family_name, face->style_name );
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nv_pixmap_cell_text( target, 0, 0, temp, TEXT_COLOR );
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FT_Get_Glyph_Name( face, glyph_index, temp2, 63 );
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temp2[63] = 0;
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sprintf( temp, "glyph %4d: %s", glyph_index, temp2 );
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nv_pixmap_cell_text( target, 0, 8, temp, TEXT_COLOR );
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}
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}
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static void
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handle_event( NVV_EventRec* ev )
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{
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switch (ev->key)
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{
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case NVV_Key_Left:
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{
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if ( glyph_index > 0 )
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glyph_index--;
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break;
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}
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case NVV_Key_Right:
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{
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if ( glyph_index+1 < face->num_glyphs )
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glyph_index++;
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break;
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}
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case NVV_KEY('a'):
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{
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option_show_axis = !option_show_axis;
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break;
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}
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case NVV_KEY('s'):
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{
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option_show_stroke = !option_show_stroke;
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break;
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}
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case NVV_KEY('g'):
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{
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option_show_glyph = !option_show_glyph;
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break;
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}
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case NVV_KEY('d'):
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{
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option_show_dots = !option_show_dots;
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break;
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}
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case NVV_KEY('e'):
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{
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option_show_em = !option_show_em;
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break;
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}
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case NVV_KEY('+'):
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{
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grid_scale *= 1.2;
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reset_scale( grid_scale );
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break;
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}
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case NVV_KEY('-'):
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{
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if (grid_scale > 0.3)
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{
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grid_scale /= 1.2;
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reset_scale( grid_scale );
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}
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break;
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}
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case NVV_Key_Up:
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{
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pixel_size++;
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reset_size( pixel_size, grid_scale );
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break;
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}
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case NVV_Key_Down:
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{
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if (pixel_size > 1)
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{
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pixel_size--;
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reset_size( pixel_size, grid_scale );
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}
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break;
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}
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case NVV_KEY('h'):
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{
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option_hinting = !option_hinting;
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break;
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}
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}
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}
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int main( int argc, char** argv )
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{
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/* create library */
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error = nv_renderer_new( 0, &renderer );
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if (error) Panic( "could not create Nirvana renderer" );
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memory = nv_renderer_get_memory( renderer );
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error = nvv_display_new( renderer, &display );
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if (error) Panic( "could not create display" );
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error = nvv_surface_new( display, 400, 400, nv_pixmap_type_argb, &surface );
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if (error) Panic( "could not create surface" );
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target = nvv_surface_get_pixmap( surface );
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error = nv_painter_new( renderer, &painter );
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if (error) Panic( "could not create painter" );
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nv_painter_set_target( painter, target );
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clear_background();
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error = FT_Init_FreeType( &freetype );
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if (error) Panic( "could not initialise FreeType" );
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error = FT_New_Face( freetype, "c:/winnt/fonts/times.ttf", 0, &face );
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if (error) Panic( "could not open font face" );
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reset_size( pixel_size, grid_scale );
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nvv_surface_set_title( surface, "FreeType Glyph Viewer" );
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{
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NVV_EventRec event;
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glyph_index = 0;
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for ( ;; )
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{
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clear_background();
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draw_grid();
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draw_glyph( glyph_index );
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nvv_surface_refresh( surface, NULL );
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nvv_surface_listen( surface, 0, &event );
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if ( event.key == NVV_Key_Esc )
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break;
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handle_event( &event );
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switch (event.key)
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{
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case NVV_Key_Esc:
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goto Exit;
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default:
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;
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}
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}
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}
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Exit:
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/* wait for escape */
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/* destroy display (and surface) */
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nvv_display_unref( display );
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nv_renderer_unref( renderer );
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return 0;
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}
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