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Bug 739096 - Look up new FreeType variation APIs at runtime, in case we were built against an older installed freetype. r=jrmuizel
Differential Revision: https://phabricator.services.mozilla.com/D112589
This commit is contained in:
Jonathan Kew
parent
32b773d2e6
commit
7135beb692
@ -72,6 +72,7 @@
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#else
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#define access(p, m) 0
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#endif
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#include <dlfcn.h>
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/* Fontconfig version older than 2.6 didn't have these options */
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#ifndef FC_LCD_FILTER
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@ -119,6 +120,16 @@ extern void mozilla_UnlockFTLibrary(FT_Library aLibrary);
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? mozilla_UnlockSharedFTFace((unscaled)->face_context) \
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: (void)CAIRO_MUTEX_UNLOCK((unscaled)->mutex))
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/**
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* Function types for FreeType symbols we'll look up at runtime, rather than
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* relying on build-time checks for availability.
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*/
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typedef FT_Error (*GetVarFunc) (FT_Face, FT_MM_Var**);
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typedef FT_Error (*DoneVarFunc) (FT_Library, FT_MM_Var*);
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typedef FT_Error (*GetVarDesignCoordsFunc) (FT_Face, FT_UInt, FT_Fixed*);
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typedef FT_Error (*SetVarDesignCoordsFunc) (FT_Face, FT_UInt, FT_Fixed*);
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typedef FT_Error (*GetVarBlendCoordsFunc) (FT_Face, FT_UInt, FT_Fixed*);
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/**
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* SECTION:cairo-ft
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* @Title: FreeType Fonts
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@ -477,22 +488,31 @@ _cairo_ft_unscaled_font_init (cairo_ft_unscaled_font_t *unscaled,
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unscaled->have_color = FT_HAS_COLOR (face) != 0;
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unscaled->have_color_set = TRUE;
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#ifdef HAVE_FT_GET_VAR_DESIGN_COORDINATES
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{
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static GetVarFunc getVar;
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static DoneVarFunc doneVar;
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static GetVarDesignCoordsFunc getVarDesignCoords;
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static int firstTime = 1;
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if (firstTime) {
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getVar = (GetVarFunc) dlsym (RTLD_DEFAULT, "FT_Get_MM_Var");
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doneVar = (DoneVarFunc) dlsym (RTLD_DEFAULT, "FT_Done_MM_Var");
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getVarDesignCoords = (GetVarDesignCoordsFunc) dlsym (RTLD_DEFAULT, "FT_Get_Var_Design_Coordinates");
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firstTime = 0;
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}
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if (getVar && getVarDesignCoords) {
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FT_MM_Var *ft_mm_var;
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if (0 == FT_Get_MM_Var (face, &ft_mm_var))
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if (0 == (*getVar) (face, &ft_mm_var))
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{
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unscaled->variations = calloc (ft_mm_var->num_axis, sizeof (FT_Fixed));
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if (unscaled->variations)
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FT_Get_Var_Design_Coordinates (face, ft_mm_var->num_axis, unscaled->variations);
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#if HAVE_FT_DONE_MM_VAR
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FT_Done_MM_Var (face->glyph->library, ft_mm_var);
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#else
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free (ft_mm_var);
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#endif
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(*getVarDesignCoords) (face, ft_mm_var->num_axis, unscaled->variations);
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if (doneVar)
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(*doneVar) (face->glyph->library, ft_mm_var);
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else
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free (ft_mm_var);
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}
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}
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#endif
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} else {
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char *filename_copy;
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@ -2366,7 +2386,24 @@ cairo_ft_apply_variations (FT_Face face,
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FT_Error ret;
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unsigned int instance_id = scaled_font->unscaled->id >> 16;
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ret = FT_Get_MM_Var (face, &ft_mm_var);
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static GetVarFunc getVar;
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static DoneVarFunc doneVar;
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static GetVarDesignCoordsFunc getVarDesignCoords;
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static SetVarDesignCoordsFunc setVarDesignCoords;
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static int firstTime = 1;
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if (firstTime) {
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getVar = (GetVarFunc) dlsym (RTLD_DEFAULT, "FT_Get_MM_Var");
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doneVar = (DoneVarFunc) dlsym (RTLD_DEFAULT, "FT_Done_MM_Var");
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getVarDesignCoords = (GetVarDesignCoordsFunc) dlsym (RTLD_DEFAULT, "FT_Get_Var_Design_Coordinates");
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setVarDesignCoords = (SetVarDesignCoordsFunc) dlsym (RTLD_DEFAULT, "FT_Set_Var_Design_Coordinates");
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firstTime = 0;
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}
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if (!getVar || !setVarDesignCoords)
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return;
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ret = (*getVar) (face, &ft_mm_var);
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if (ret == 0) {
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FT_Fixed *current_coords;
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FT_Fixed *coords;
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@ -2431,27 +2468,28 @@ skip:
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}
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current_coords = malloc (sizeof (FT_Fixed) * ft_mm_var->num_axis);
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#ifdef HAVE_FT_GET_VAR_DESIGN_COORDINATES
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ret = FT_Get_Var_Design_Coordinates (face, ft_mm_var->num_axis, current_coords);
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if (ret == 0) {
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for (i = 0; i < ft_mm_var->num_axis; i++) {
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if (coords[i] != current_coords[i])
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break;
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}
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if (i == ft_mm_var->num_axis)
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goto done;
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}
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#endif
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FT_Set_Var_Design_Coordinates (face, ft_mm_var->num_axis, coords);
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if (getVarDesignCoords) {
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ret = (*getVarDesignCoords) (face, ft_mm_var->num_axis, current_coords);
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if (ret == 0) {
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for (i = 0; i < ft_mm_var->num_axis; i++) {
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if (coords[i] != current_coords[i])
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break;
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}
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if (i == ft_mm_var->num_axis)
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goto done;
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}
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}
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(*setVarDesignCoords) (face, ft_mm_var->num_axis, coords);
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done:
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free (coords);
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free (current_coords);
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#if HAVE_FT_DONE_MM_VAR
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FT_Done_MM_Var (face->glyph->library, ft_mm_var);
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#else
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free (ft_mm_var);
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#endif
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if (doneVar)
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(*doneVar) (face->glyph->library, ft_mm_var);
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else
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free (ft_mm_var);
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}
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}
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@ -2877,6 +2915,18 @@ _cairo_ft_is_synthetic (void *abstract_font,
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FT_Face face;
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FT_Error error;
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static GetVarFunc getVar;
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static DoneVarFunc doneVar;
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static GetVarBlendCoordsFunc getVarBlendCoords;
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static int firstTime = 1;
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if (firstTime) {
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getVar = (GetVarFunc) dlsym (RTLD_DEFAULT, "FT_Get_MM_Var");
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doneVar = (DoneVarFunc) dlsym (RTLD_DEFAULT, "FT_Done_MM_Var");
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getVarBlendCoords = (GetVarBlendCoordsFunc) dlsym (RTLD_DEFAULT, "FT_Get_Var_Blend_Coordinates");
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firstTime = 0;
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}
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if (scaled_font->ft_options.synth_flags != 0) {
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*is_synthetic = TRUE;
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return status;
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@ -2896,7 +2946,7 @@ _cairo_ft_is_synthetic (void *abstract_font,
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* are the same as the font tables */
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*is_synthetic = TRUE;
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error = FT_Get_MM_Var (face, &mm_var);
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error = getVar ? (*getVar) (face, &mm_var) : -1;
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if (error) {
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status = _cairo_error (_ft_to_cairo_error (error));
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goto cleanup;
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@ -2909,15 +2959,14 @@ _cairo_ft_is_synthetic (void *abstract_font,
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goto cleanup;
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}
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#if FREETYPE_MAJOR > 2 || ( FREETYPE_MAJOR == 2 && FREETYPE_MINOR >= 8)
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/* If FT_Get_Var_Blend_Coordinates() is available, we can check if the
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* current design coordinates are the default coordinates. In this case
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* the current outlines match the font tables.
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*/
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{
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if (getVarBlendCoords) {
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int i;
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FT_Get_Var_Blend_Coordinates (face, num_axis, coords);
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(*getVarBlendCoords) (face, num_axis, coords);
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*is_synthetic = FALSE;
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for (i = 0; i < num_axis; i++) {
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if (coords[i]) {
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@ -2926,15 +2975,13 @@ _cairo_ft_is_synthetic (void *abstract_font,
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}
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}
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}
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#endif
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cleanup:
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free (coords);
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#if HAVE_FT_DONE_MM_VAR
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FT_Done_MM_Var (face->glyph->library, mm_var);
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#else
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free (mm_var);
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#endif
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if (doneVar)
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(*doneVar) (face->glyph->library, mm_var);
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else
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free (mm_var);
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}
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_cairo_ft_unscaled_font_unlock_face (unscaled);
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