switch font rendering to pangocairo
to make colour font rendering work
This commit is contained in:
John Cupitt
parent
8412b8233c
commit
f53959b824
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@ -22,6 +22,7 @@
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- add vips_image_[set|get]_array_double()
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- add GIF load with libnsgif
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- add JPEG2000 load and save
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- add "rgba" flag to vips_text() to enable full colour text rendering
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22/12/20 start 8.10.6
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- don't seek on bad file descriptors [kleisauke]
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30
configure.ac
30
configure.ac
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@ -1083,25 +1083,25 @@ fi
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VIPS_CFLAGS="$VIPS_CFLAGS $LIBWEBP_CFLAGS"
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VIPS_LIBS="$VIPS_LIBS $LIBWEBP_LIBS"
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# pangoft2
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AC_ARG_WITH([pangoft2],
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AS_HELP_STRING([--without-pangoft2],
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[build without pangoft2 (default: test)]))
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# pangocairo for text rendering
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AC_ARG_WITH([pangocairo],
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AS_HELP_STRING([--without-pangocairo],
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[build without pangocairo (default: test)]))
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if test x"$with_pangoft2" != x"no"; then
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PKG_CHECK_MODULES(PANGOFT2, pangoft2,
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[AC_DEFINE(HAVE_PANGOFT2,1,[define if you have pangoft2 installed.])
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with_pangoft2=yes
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PACKAGES_USED="$PACKAGES_USED pangoft2"
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if test x"$with_pangocairo" != x"no"; then
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PKG_CHECK_MODULES(PANGOCAIRO, pangocairo,
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[AC_DEFINE(HAVE_PANGOCAIRO,1,[define if you have pangocairo installed.])
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with_pangocairo=yes
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PACKAGES_USED="$PACKAGES_USED pangocairo"
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],
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[AC_MSG_WARN([pangoft2 not found; disabling pangoft2 support])
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with_pangoft2=no
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[AC_MSG_WARN([pangocairo not found; disabling pangocairo support])
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with_pangocairo=no
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]
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)
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fi
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VIPS_CFLAGS="$VIPS_CFLAGS $PANGOFT2_CFLAGS"
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VIPS_LIBS="$VIPS_LIBS $PANGOFT2_LIBS"
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VIPS_CFLAGS="$VIPS_CFLAGS $PANGOCAIRO_CFLAGS"
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VIPS_LIBS="$VIPS_LIBS $PANGOCAIRO_LIBS"
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# look for TIFF with pkg-config ... fall back to our tester
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# pkgconfig support for libtiff starts with libtiff-4
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@ -1325,7 +1325,7 @@ use fftw3 for FFT: $with_fftw, \
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accelerate loops with orc: $with_orc, \
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ICC profile support with lcms: $with_lcms, \
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zlib: $with_zlib, \
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text rendering with pangoft2: $with_pangoft2, \
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text rendering with pangocairo: $with_pangocairo, \
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EXIF metadata support with libexif: $with_libexif, \
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JPEG load/save with libjpeg: $with_jpeg, \
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PNG load with libspng: $with_libspng, \
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@ -1427,7 +1427,7 @@ accelerate loops with orc: $with_orc
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(requires orc-0.4.11 or later)
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ICC profile support with lcms: $with_lcms
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zlib: $with_zlib
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text rendering with pangoft2: $with_pangoft2
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text rendering with pangocairo: $with_pangocairo
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EXIF metadata support with libexif: $with_libexif
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## File format support
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@ -116,9 +116,9 @@ vips_create_operation_init( void )
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extern GType vips_gaussmat_get_type( void );
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extern GType vips_logmat_get_type( void );
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extern GType vips_gaussnoise_get_type( void );
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#ifdef HAVE_PANGOFT2
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#ifdef HAVE_PANGOCAIRO
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extern GType vips_text_get_type( void );
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#endif /*HAVE_PANGOFT2*/
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#endif /*HAVE_PANGOCAIRO*/
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extern GType vips_xyz_get_type( void );
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extern GType vips_eye_get_type( void );
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extern GType vips_grey_get_type( void );
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@ -146,9 +146,9 @@ vips_create_operation_init( void )
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vips_gaussmat_get_type();
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vips_logmat_get_type();
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vips_gaussnoise_get_type();
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#ifdef HAVE_PANGOFT2
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#ifdef HAVE_PANGOCAIRO
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vips_text_get_type();
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#endif /*HAVE_PANGOFT2*/
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#endif /*HAVE_PANGOCAIRO*/
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vips_xyz_get_type();
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vips_eye_get_type();
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vips_grey_get_type();
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@ -32,6 +32,9 @@
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* - fitting could occasionally terminate early [levmorozov]
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* 16/5/20 [keiviv]
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* - don't add fontfiles repeatedly
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* 12/4/21
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* - switch to cairo for text rendering
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* - add rgba flag
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*/
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/*
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@ -74,11 +77,13 @@
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#include <string.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#ifdef HAVE_PANGOFT2
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#ifdef HAVE_PANGOCAIRO
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#include <cairo.h>
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#include <pango/pango.h>
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#include <pango/pangoft2.h>
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#include <pango/pangocairo.h>
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#include "pcreate.h"
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@ -96,7 +101,6 @@ typedef struct _VipsText {
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char *fontfile;
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gboolean rgba;
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FT_Bitmap bitmap;
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PangoContext *context;
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PangoLayout *layout;
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@ -130,7 +134,6 @@ vips_text_dispose( GObject *gobject )
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VIPS_UNREF( text->layout );
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VIPS_UNREF( text->context );
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VIPS_FREE( text->bitmap.buffer );
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G_OBJECT_CLASS( vips_text_parent_class )->dispose( gobject );
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}
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@ -187,8 +190,8 @@ vips_text_get_extents( VipsText *text, VipsRect *extents )
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PangoRectangle ink_rect;
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PangoRectangle logical_rect;
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pango_ft2_font_map_set_resolution(
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PANGO_FT2_FONT_MAP( vips_text_fontmap ), text->dpi, text->dpi );
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pango_cairo_font_map_set_resolution(
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PANGO_CAIRO_FONT_MAP( vips_text_fontmap ), text->dpi );
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VIPS_UNREF( text->layout );
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if( !(text->layout = text_layout_new( text->context,
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@ -345,8 +348,8 @@ vips_text_build( VipsObject *object )
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VipsRect extents;
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int bands;
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VipsInterpretation interpretation;
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FT_Pixel_Mode pixel_mode;
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int y;
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cairo_surface_t *surface;
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cairo_t *cr;
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if( VIPS_OBJECT_CLASS( vips_text_parent_class )->build( object ) )
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return( -1 );
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@ -360,7 +363,7 @@ vips_text_build( VipsObject *object )
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g_mutex_lock( vips_text_lock );
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if( !vips_text_fontmap )
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vips_text_fontmap = pango_ft2_font_map_new();
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vips_text_fontmap = pango_cairo_font_map_new();
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if( !vips_text_fontfiles )
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vips_text_fontfiles =
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g_hash_table_new( g_str_hash, g_str_equal );
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@ -368,6 +371,7 @@ vips_text_build( VipsObject *object )
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text->context = pango_font_map_create_context(
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PANGO_FONT_MAP( vips_text_fontmap ) );
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/*
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if( text->fontfile &&
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!g_hash_table_lookup( vips_text_fontfiles, text->fontfile ) ) {
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if( !FcConfigAppFontAddFile( NULL,
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@ -382,6 +386,7 @@ vips_text_build( VipsObject *object )
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text->fontfile,
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g_strdup( text->fontfile ) );
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}
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*/
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/* If our caller set height and not dpi, we adjust dpi until
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* we get a fit.
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@ -406,54 +411,56 @@ vips_text_build( VipsObject *object )
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if( text->rgba ) {
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interpretation = VIPS_INTERPRETATION_sRGB;
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bands = 4;
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pixel_mode = FT_PIXEL_MODE_BGRA;
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}
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else {
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interpretation = VIPS_INTERPRETATION_MULTIBAND;
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bands = 1;
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pixel_mode = FT_PIXEL_MODE_GRAY;
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}
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text->bitmap.width = extents.width;
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text->bitmap.pitch = (bands * text->bitmap.width + 3) & ~3;
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text->bitmap.rows = extents.height;
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if( !(text->bitmap.buffer =
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VIPS_ARRAY( NULL,
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text->bitmap.pitch * text->bitmap.rows, VipsPel )) ) {
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g_mutex_unlock( vips_text_lock );
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return( -1 );
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}
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text->bitmap.num_grays = 256;
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text->bitmap.pixel_mode = pixel_mode;
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memset( text->bitmap.buffer, 0x00,
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text->bitmap.pitch * text->bitmap.rows );
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pango_ft2_render_layout( &text->bitmap, text->layout,
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-extents.left, -extents.top );
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/* Set DPI as pixels/mm.
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*/
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vips_image_init_fields( create->out,
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text->bitmap.width, text->bitmap.rows, bands,
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extents.width, extents.height, bands,
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VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
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interpretation, text->dpi / 25.4, text->dpi / 25.4 );
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g_mutex_unlock( vips_text_lock );
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vips_image_pipelinev( create->out, VIPS_DEMAND_STYLE_ANY, NULL );
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create->out->Xoffset = extents.left;
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create->out->Yoffset = extents.top;
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if( text->rgba ) {
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/* Convert premultiplied BGRA to RGBA.
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*/
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if( vips_image_write_prepare( create->out ) ) {
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g_mutex_unlock( vips_text_lock );
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return( -1 );
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}
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for( y = 0; y < text->bitmap.rows; y++ )
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if( vips_image_write_line( create->out, y,
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(VipsPel *) text->bitmap.buffer +
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y * text->bitmap.pitch ) )
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return( -1 );
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surface = cairo_image_surface_create_for_data(
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VIPS_IMAGE_ADDR( create->out, 0, 0 ),
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text->rgba ? CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_A8,
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create->out->Xsize, create->out->Ysize,
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VIPS_IMAGE_SIZEOF_LINE( create->out ) );
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cr = cairo_create( surface );
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cairo_surface_destroy( surface );
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cairo_translate( cr, -extents.left, -extents.top );
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pango_cairo_show_layout( cr, text->layout );
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cairo_destroy( cr );
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g_mutex_unlock( vips_text_lock );
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if( text->rgba ) {
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int y;
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/* Cairo makes pre-multipled BRGA -- we must byteswap and
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* unpremultiply.
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*/
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for( y = 0; y < create->out->Ysize; y++ )
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vips__premultiplied_bgra2rgba(
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(guint32 *)
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VIPS_IMAGE_ADDR( create->out, 0, y ),
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create->out->Xsize );
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}
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return( 0 );
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}
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@ -569,11 +576,10 @@ vips_text_init( VipsText *text )
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{
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text->align = VIPS_ALIGN_LOW;
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text->dpi = 72;
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text->bitmap.buffer = NULL;
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VIPS_SETSTR( text->font, "sans 12" );
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}
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#endif /*HAVE_PANGOFT2*/
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#endif /*HAVE_PANGOCAIRO*/
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/**
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* vips_text:
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