Mercurial > MadButterfly
view src/graph_engine_cairo.c @ 842:76fe4afce640
The inkscape:bbox is defined as the global coordinate system. However, the center.x and center.y must be the coordiante system of the parent group of the SVG entity. Therefore, we need to do coordinate transformation from the global coordination system to the local coordination system.
author | wycc |
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date | Sat, 18 Sep 2010 21:23:51 +0800 |
parents | 586e50f82c1f |
children | 74e3ba4d3fa1 |
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// -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*- // vim: sw=4:ts=8:sts=4 #include <fontconfig/fontconfig.h> #include <cairo-ft.h> #include "mb_graph_engine_cairo.h" #include "mb_shapes.h" #ifndef ASSERT #define ASSERT(x) #endif /*! \brief Find out a font pattern. * * This function use fontconfig to decide a font file in pattern. It can * replaced by other mechanism if you think it is not what you want. * * \param slant make font prune if it it non-zero. * \param weight make font normal if it is 100. */ static FcPattern *query_font_pattern(const char *family, int slant, int weight) { FcPattern *ptn, *p, *fn_ptn; FcValue val; FcConfig *cfg; FcBool r; FcResult result; static int slant_map[] = { /* from MB_FONT_SLANT_* to FC_SLANT_* */ FC_SLANT_ROMAN, FC_SLANT_ROMAN, FC_SLANT_ITALIC, FC_SLANT_OBLIQUE}; cfg = FcConfigGetCurrent(); ptn = FcPatternCreate(); p = FcPatternCreate(); if(ptn == NULL || p == NULL) goto err; val.type = FcTypeString; val.u.s = family; FcPatternAdd(ptn, "family", val, FcTrue); val.type = FcTypeInteger; val.u.i = slant_map[slant]; FcPatternAdd(ptn, "slant", val, FcTrue); val.type = FcTypeInteger; val.u.i = weight; FcPatternAdd(ptn, "weight", val, FcTrue); r = FcConfigSubstituteWithPat(cfg, ptn, NULL, FcMatchPattern); if(!r) goto err; r = FcConfigSubstituteWithPat(cfg, p, ptn, FcMatchFont); if(!r) goto err; FcDefaultSubstitute(p); fn_ptn = FcFontMatch(cfg, p, &result); /* It is supposed to return FcResultMatch. But, it is no, now. * I don't know why. Someone should figure out the issue. */ #if 0 if(result != FcResultMatch) { printf("%d %d\n", result, FcResultMatch); goto err; } #endif if(fn_ptn == NULL) goto err; FcPatternDestroy(ptn); FcPatternDestroy(p); return fn_ptn; err: if(ptn) FcPatternDestroy(ptn); if(p) FcPatternDestroy(p); return NULL; } /*! \brief Find out a font face for a pattern specified. * * The pattern, here, is a vector of family, slant, and weight. * This function base on fontconfig and cairo FreeType font supporting. * You can replace this function with other font mechanisms. */ mbe_font_face_t * mbe_query_font_face(const char *family, int slant, int weight) { mbe_font_face_t *cface; FcPattern *ptn; ptn = query_font_pattern(family, slant, weight); cface = cairo_ft_font_face_create_for_pattern(ptn); FcPatternDestroy(ptn); return cface; } void mbe_free_font_face(mbe_font_face_t *face) { ASSERT(face == NULL); mbe_font_face_destroy(face); } mbe_pattern_t * mbe_pattern_create_radial(co_aix cx0, co_aix cy0, co_aix radius0, co_aix cx1, co_aix cy1, co_aix radius1, grad_stop_t *stops, int stop_cnt) { cairo_pattern_t *ptn; grad_stop_t *stop; int i; ptn = cairo_pattern_create_radial(cx0, cy0, radius0, cx1, cy1, radius1); if(ptn == NULL) return NULL; stop = stops; for(i = 0; i < stop_cnt; i++) { cairo_pattern_add_color_stop_rgba(ptn, stop->offset, stop->r, stop->g, stop->b, stop->a); stop++; } return ptn; } mbe_pattern_t * mbe_pattern_create_linear(co_aix x0, co_aix y0, co_aix x1, co_aix y1, grad_stop_t *stops, int stop_cnt) { cairo_pattern_t *ptn; grad_stop_t *stop; int i; ptn = cairo_pattern_create_linear(x0, y0, x1, y1); if(ptn == NULL) return NULL; stop = stops; for(i = 0; i < stop_cnt; i++) { cairo_pattern_add_color_stop_rgba(ptn, stop->offset, stop->r, stop->g, stop->b, stop->a); stop++; } return ptn; }