lib/gfxdevice.h

   1 #ifndef __gfxdevice_h__
   2 #define __gfxdevice_h__
   3
   4 #ifdef __cplusplus
   5 extern "C" {
   6 #endif
   7
   8 #define GFX_SUBPIXEL 2560
   9
  10 typedef double gfxcoord_t;
  11
  12 typedef enum {gfx_moveTo, gfx_lineTo, gfx_splineTo} gfx_linetype;
  13 typedef enum {gfx_joinMiter, gfx_joinRound, gfx_joinBevel} gfx_joinType;
  14 typedef enum {gfx_capButt, gfx_capRound, gfx_capSquare} gfx_capType;
  15
  16 typedef struct _gfxline
  17 {
  18     gfx_linetype type;
  19     gfxcoord_t x,y;
  20     gfxcoord_t sx,sy;
  21     struct _gfxline*next; /*NULL=end*/
  22 } gfxline_t;
  23
  24 typedef struct _gfxglyph
  25 {
  26     gfxline_t*line;
  27     gfxcoord_t advance;
  28
  29     int unicode; // array?
  30     const char*name;
  31 } gfxglyph_t;
  32
  33 typedef struct _gfxkerning
  34 {
  35     int c1,c2,advance;
  36 } gfxkerning_t;
  37
  38 typedef struct _gfxfont
  39 {
  40     const char*id;
  41     int num_glyphs;
  42     int max_unicode;
  43
  44     double ascent,descent;
  45
  46     gfxglyph_t*glyphs;
  47     int* unicode2glyph;
  48
  49     gfxkerning_t*kerning;
  50     int kerning_size;
  51 } gfxfont_t;
  52
  53 typedef struct _gfxcolor
  54 {
  55     unsigned char a;
  56     unsigned char r;
  57     unsigned char g;
  58     unsigned char b;
  59 } gfxcolor_t;
  60
  61 typedef struct _gfxmatrix
  62 {
  63     double m00,m10,tx;
  64     double m01,m11,ty;
  65 } gfxmatrix_t;
  66
  67 typedef struct _gfximage
  68 {
  69     /* if the data contains an alpha layer (a != 255), the
  70        r,g,b values will have to be premultiplied */
  71     gfxcolor_t*data;
  72     unsigned width;
  73     unsigned height;
  74 } gfximage_t;
  75
  76 /* gradients: A radial gradient will start at 0,0 and have a radius of 1,0
  77               An axial gradient starts at -1,0 and ends at 1,0
  78  */
  79 typedef enum {gfxgradient_radial, gfxgradient_linear} gfxgradienttype_t;
  80 typedef struct _gfxgradient
  81 {
  82     gfxcolor_t color;
  83     float pos; // 0.0 - 1.0
  84     struct _gfxgradient*next; //NULL=end
  85 } gfxgradient_t;
  86
  87 typedef struct _gfxcxform
  88 {
  89     float rr,rg,rb,ra, tr;
  90     float gr,gg,gb,ga, tg;
  91     float br,bg,bb,ba, tb;
  92     float ar,ag,ab,aa, ta;
  93 } gfxcxform_t;
  94
  95 typedef struct _gfxbbox
  96 {
  97     gfxcoord_t xmin, ymin, xmax, ymax;
  98 } gfxbbox_t;
  99
 100 typedef struct _gfxresult
 101 {
 102     void (*write)(struct _gfxresult*gfx, int filedesc);
 103     int (*save)(struct _gfxresult*gfx, const char*filename);
 104     void* (*get)(struct _gfxresult*gfx, const char*name);
 105     void (*destroy)(struct _gfxresult*gfx);
 106
 107     void*internal;
 108 } gfxresult_t;
 109
 110 typedef struct _gfxdevice
 111 {
 112     const char* name; // gfx device name
 113
 114     int (*setparameter)(struct _gfxdevice*dev, const char*key, const char*value);
 115
 116     void (*startpage)(struct _gfxdevice*dev, int width, int height);
 117
 118     void (*startclip)(struct _gfxdevice*dev, gfxline_t*line);
 119     void (*endclip)(struct _gfxdevice*dev);
 120     void (*stroke)(struct _gfxdevice*dev, gfxline_t*line, gfxcoord_t width, gfxcolor_t*color, gfx_capType cap_style, gfx_joinType joint_style, gfxcoord_t miterLimit);
 121     void (*fill)(struct _gfxdevice*dev, gfxline_t*line, gfxcolor_t*color);
 122
 123     /* expects alpha channel in image to be non-premultiplied */
 124     void (*fillbitmap)(struct _gfxdevice*dev, gfxline_t*line, gfximage_t*img, gfxmatrix_t*imgcoord2devcoord, gfxcxform_t*cxform); //cxform? tiling?
 125
 126     void (*fillgradient)(struct _gfxdevice*dev, gfxline_t*line, gfxgradient_t*gradient, gfxgradienttype_t type, gfxmatrix_t*gradcoord2devcoord); //?
 127
 128     void (*addfont)(struct _gfxdevice*dev, gfxfont_t*font);
 129
 130     void (*drawchar)(struct _gfxdevice*dev, gfxfont_t*font, int glyph, gfxcolor_t*color, gfxmatrix_t*matrix);
 131
 132     void (*drawlink)(struct _gfxdevice*dev, gfxline_t*line, const char*action);
 133
 134     void (*endpage)(struct _gfxdevice*dev);
 135
 136     const char* (*geterror)();
 137
 138     gfxresult_t* (*finish)(struct _gfxdevice*dev);
 139
 140     void* internal;
 141 } gfxdevice_t;
 142
 143 #ifdef __cplusplus
 144 }
 145 #endif
 146
 147 #endif //__gfxdevice_h__