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Diffstat (limited to 'canvas.lv2/render.h')
| -rw-r--r-- | canvas.lv2/render.h | 592 |
1 files changed, 592 insertions, 0 deletions
diff --git a/canvas.lv2/render.h b/canvas.lv2/render.h new file mode 100644 index 00000000..2882c877 --- /dev/null +++ b/canvas.lv2/render.h @@ -0,0 +1,592 @@ +/* + * Copyright (c) 2016 Hanspeter Portner (dev@open-music-kontrollers.ch) + * + * This is free software: you can redistribute it and/or modify + * it under the terms of the Artistic License 2.0 as published by + * The Perl Foundation. + * + * This source is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * Artistic License 2.0 for more details. + * + * You should have received a copy of the Artistic License 2.0 + * along the source as a COPYING file. If not, obtain it from + * http://www.perlfoundation.org/artistic_license_2_0. + */ + +#ifndef _LV2_CANVAS_RENDER_H +#define _LV2_CANVAS_RENDER_H + +#include <assert.h> + +#include <canvas.lv2/canvas.h> + +#include <cairo/cairo.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#define LV2_CANVAS_NUM_METHODS 26 + +typedef struct _LV2_Canvas_Meth LV2_Canvas_Meth; +typedef struct _LV2_Canvas LV2_Canvas; +typedef void (*LV2_Canvas_Func)(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body); + +struct _LV2_Canvas_Meth { + LV2_URID command; + LV2_Canvas_Func func; +}; + +struct _LV2_Canvas { + LV2_Canvas_URID urid; + LV2_Canvas_Meth methods [LV2_CANVAS_NUM_METHODS]; +}; + +static inline const float * +_lv2_canvas_render_get_float_vecs(LV2_Canvas_URID *urid, const LV2_Atom *body, + uint32_t *n) +{ + const LV2_Atom_Vector *vec = (const LV2_Atom_Vector *)body; + const float *flt = LV2_ATOM_CONTENTS_CONST(LV2_Atom_Vector, vec); + *n = (vec->atom.type == urid->forge.Vector) + && (vec->body.child_type == urid->forge.Float) + && (vec->body.child_size == sizeof(float)) + ? (vec->atom.size - sizeof(LV2_Atom_Vector_Body)) / vec->body.child_size + : 0; + + return flt; +} + +static inline const float * +_lv2_canvas_render_get_float_vec(LV2_Canvas_URID *urid, const LV2_Atom *body, + uint32_t n) +{ + uint32_t N; + const float *flt = _lv2_canvas_render_get_float_vecs(urid, body, &N); + + return n == N ? flt : NULL; +} + +static inline const void * +_lv2_canvas_render_get_type(const LV2_Atom *body, LV2_URID type) +{ + return body->type == type + ? LV2_ATOM_BODY_CONST(body) + : NULL; +} + +static inline void +_lv2_canvas_render_beginPath(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_new_sub_path(ctx); +} + +static inline void +_lv2_canvas_render_closePath(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_close_path(ctx); +} + +static inline void +_lv2_canvas_render_arc(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 5); + + if(v) + { + cairo_arc(ctx, v[0], v[1], v[2], v[3], v[4]); + } +} + +static inline void +_lv2_canvas_render_curveTo(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 6); + + if(v) + { + cairo_curve_to(ctx, v[0], v[1], v[2], v[3], v[4], v[5]); + } +} + +static inline void +_lv2_canvas_render_lineTo(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 2); + + if(v) + { + cairo_line_to(ctx, v[0], v[1]); + } +} + +static inline void +_lv2_canvas_render_moveTo(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 2); + + if(v) + { + cairo_move_to(ctx, v[0], v[1]); + } +} + +static inline void +_lv2_canvas_render_rectangle(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 4); + + if(v) + { + cairo_rectangle(ctx, v[0], v[1], v[2], v[3]); + } +} + +static inline void +_lv2_canvas_render_polyline(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + uint32_t N; + const float *v = _lv2_canvas_render_get_float_vecs(urid, body, &N); + + if(v) + { + for(uint32_t i = 0; i < 2; i += 2) + { + cairo_move_to(ctx, v[i], v[i+1]); + } + + for(uint32_t i = 2; i < N; i += 2) + { + cairo_line_to(ctx, v[i], v[i+1]); + } + } +} + +static inline void +_lv2_canvas_render_style(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const int64_t *v = _lv2_canvas_render_get_type(body, urid->forge.Long); + + if(v) + { + const float r = (float)((*v >> 24) & 0xff) / 0xff; + const float g = (float)((*v >> 16) & 0xff) / 0xff; + const float b = (float)((*v >> 8) & 0xff) / 0xff; + const float a = (float)((*v >> 0) & 0xff) / 0xff; + + cairo_set_source_rgba(ctx, r, g, b, a); + } +} + +static inline void +_lv2_canvas_render_lineWidth(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_type(body, urid->forge.Float); + + if(v) + { + cairo_set_line_width(ctx, *v); + } +} + +static inline void +_lv2_canvas_render_lineDash(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 2); + + if(v) + { + const double d[2] = {v[0], v[1]}; + cairo_set_dash(ctx, d, 2, 0); + } +} + +static inline void +_lv2_canvas_render_lineCap(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const LV2_URID *v = _lv2_canvas_render_get_type(body, urid->forge.URID); + + if(v) + { + cairo_line_cap_t cap = CAIRO_LINE_CAP_BUTT; + + if(*v == urid->Canvas_lineCapButt) + cap = CAIRO_LINE_CAP_BUTT; + else if(*v == urid->Canvas_lineCapRound) + cap = CAIRO_LINE_CAP_ROUND; + else if(*v == urid->Canvas_lineCapSquare) + cap = CAIRO_LINE_CAP_SQUARE; + + cairo_set_line_cap(ctx, cap); + } +} + +static inline void +_lv2_canvas_render_lineJoin(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const LV2_URID *v = _lv2_canvas_render_get_type(body, urid->forge.URID); + + if(v) + { + cairo_line_join_t join = CAIRO_LINE_JOIN_MITER; + + if(*v == urid->Canvas_lineJoinMiter) + join = CAIRO_LINE_JOIN_MITER; + else if(*v == urid->Canvas_lineJoinRound) + join = CAIRO_LINE_JOIN_ROUND; + else if(*v == urid->Canvas_lineJoinBevel) + join = CAIRO_LINE_JOIN_BEVEL; + + cairo_set_line_join(ctx, join); + } +} + +static inline void +_lv2_canvas_render_miterLimit(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_type(body, urid->forge.Float); + + if(v) + { + cairo_set_miter_limit(ctx, *v); + } +} + +static inline void +_lv2_canvas_render_stroke(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_stroke(ctx); +} + +static inline void +_lv2_canvas_render_fill(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_fill(ctx); +} + +static inline void +_lv2_canvas_render_clip(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_clip(ctx); +} + +static inline void +_lv2_canvas_render_save(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_save(ctx); +} + +static inline void +_lv2_canvas_render_restore(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_restore(ctx); +} + +static inline void +_lv2_canvas_render_translate(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 2); + + if(v) + { + cairo_translate(ctx, v[0], v[1]); + } +} + +static inline void +_lv2_canvas_render_scale(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 2); + + if(v) + { + cairo_scale(ctx, v[0], v[1]); + } +} + +static inline void +_lv2_canvas_render_rotate(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_type(body, urid->forge.Float); + + if(v) + { + cairo_rotate(ctx, *v); + } +} + +static inline void +_lv2_canvas_render_transform(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_float_vec(urid, body, 6); + + if(v) + { + const cairo_matrix_t matrix = { + .xx = v[0], + .xy = v[1], + .x0 = v[2], + .yy = v[3], + .yx = v[4], + .y0 = v[5] + }; + + cairo_transform(ctx, &matrix); + } +} + +static inline void +_lv2_canvas_render_reset(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + cairo_identity_matrix(ctx); +} + +static inline void +_lv2_canvas_render_fontSize(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const float *v = _lv2_canvas_render_get_type(body, urid->forge.Float); + + if(v) + { + cairo_set_font_size(ctx, *v); + } +} + +static inline void +_lv2_canvas_render_fillText(cairo_t *ctx, + LV2_Canvas_URID *urid, const LV2_Atom *body) +{ + const char *v = _lv2_canvas_render_get_type(body, urid->forge.String); + + if(v) + { + cairo_text_extents_t extents; + cairo_text_extents(ctx, v, &extents); + const float dx = extents.width/2 + extents.x_bearing; + const float dy = extents.height/2 + extents.y_bearing; + cairo_rel_move_to(ctx, -dx, -dy); + cairo_show_text(ctx, v); + } +} + +static inline void +_lv2_canvas_qsort(LV2_Canvas_Meth *A, int n) +{ + if(n < 2) + return; + + LV2_Canvas_Meth *p = A; + + int i = -1; + int j = n; + + while(true) + { + do { + i += 1; + } while(A[i].command < p->command); + + do { + j -= 1; + } while(A[j].command > p->command); + + if(i >= j) + break; + + const LV2_Canvas_Meth tmp = A[i]; + A[i] = A[j]; + A[j] = tmp; + } + + _lv2_canvas_qsort(A, j + 1); + _lv2_canvas_qsort(A + j + 1, n - j - 1); +} + +static inline LV2_Canvas_Meth * +_lv2_canvas_bsearch(LV2_URID p, LV2_Canvas_Meth *a, int n) +{ + LV2_Canvas_Meth *base = a; + + for(int N = n, half; N > 1; N -= half) + { + half = N/2; + LV2_Canvas_Meth *dst = &base[half]; + base = (dst->command > p) ? base : dst; + } + + return (base->command == p) ? base : NULL; +} + +static inline void +lv2_canvas_init(LV2_Canvas *canvas, LV2_URID_Map *map) +{ + lv2_canvas_urid_init(&canvas->urid, map); + + unsigned ptr = 0; + + canvas->methods[ptr].command = canvas->urid.Canvas_BeginPath; + canvas->methods[ptr++].func = _lv2_canvas_render_beginPath; + + canvas->methods[ptr].command = canvas->urid.Canvas_ClosePath; + canvas->methods[ptr++].func = _lv2_canvas_render_closePath; + + canvas->methods[ptr].command = canvas->urid.Canvas_Arc; + canvas->methods[ptr++].func = _lv2_canvas_render_arc; + + canvas->methods[ptr].command = canvas->urid.Canvas_CurveTo; + canvas->methods[ptr++].func = _lv2_canvas_render_curveTo; + + canvas->methods[ptr].command = canvas->urid.Canvas_LineTo; + canvas->methods[ptr++].func = _lv2_canvas_render_lineTo; + + canvas->methods[ptr].command = canvas->urid.Canvas_MoveTo; + canvas->methods[ptr++].func = _lv2_canvas_render_moveTo; + + canvas->methods[ptr].command = canvas->urid.Canvas_Rectangle; + canvas->methods[ptr++].func = _lv2_canvas_render_rectangle; + + canvas->methods[ptr].command = canvas->urid.Canvas_PolyLine; + canvas->methods[ptr++].func = _lv2_canvas_render_polyline; + + canvas->methods[ptr].command = canvas->urid.Canvas_Style; + canvas->methods[ptr++].func = _lv2_canvas_render_style; + + canvas->methods[ptr].command = canvas->urid.Canvas_LineWidth; + canvas->methods[ptr++].func = _lv2_canvas_render_lineWidth; + + canvas->methods[ptr].command = canvas->urid.Canvas_LineDash; + canvas->methods[ptr++].func = _lv2_canvas_render_lineDash; + + canvas->methods[ptr].command = canvas->urid.Canvas_LineCap; + canvas->methods[ptr++].func = _lv2_canvas_render_lineCap; + + canvas->methods[ptr].command = canvas->urid.Canvas_LineJoin; + canvas->methods[ptr++].func = _lv2_canvas_render_lineJoin; + + canvas->methods[ptr].command = canvas->urid.Canvas_MiterLimit; + canvas->methods[ptr++].func = _lv2_canvas_render_miterLimit; + + canvas->methods[ptr].command = canvas->urid.Canvas_Stroke; + canvas->methods[ptr++].func = _lv2_canvas_render_stroke; + + canvas->methods[ptr].command = canvas->urid.Canvas_Fill; + canvas->methods[ptr++].func = _lv2_canvas_render_fill; + + canvas->methods[ptr].command = canvas->urid.Canvas_Clip; + canvas->methods[ptr++].func = _lv2_canvas_render_clip; + + canvas->methods[ptr].command = canvas->urid.Canvas_Save; + canvas->methods[ptr++].func = _lv2_canvas_render_save; + + canvas->methods[ptr].command = canvas->urid.Canvas_Restore; + canvas->methods[ptr++].func = _lv2_canvas_render_restore; + + canvas->methods[ptr].command = canvas->urid.Canvas_Translate; + canvas->methods[ptr++].func = _lv2_canvas_render_translate; + + canvas->methods[ptr].command = canvas->urid.Canvas_Scale; + canvas->methods[ptr++].func = _lv2_canvas_render_scale; + + canvas->methods[ptr].command = canvas->urid.Canvas_Rotate; + canvas->methods[ptr++].func = _lv2_canvas_render_rotate; + + canvas->methods[ptr].command = canvas->urid.Canvas_Transform; + canvas->methods[ptr++].func = _lv2_canvas_render_transform; + + canvas->methods[ptr].command = canvas->urid.Canvas_Reset; + canvas->methods[ptr++].func = _lv2_canvas_render_reset; + + canvas->methods[ptr].command = canvas->urid.Canvas_FontSize; + canvas->methods[ptr++].func = _lv2_canvas_render_fontSize; + + canvas->methods[ptr].command = canvas->urid.Canvas_FillText; + canvas->methods[ptr++].func = _lv2_canvas_render_fillText; + + assert(ptr == LV2_CANVAS_NUM_METHODS); + + _lv2_canvas_qsort(canvas->methods, LV2_CANVAS_NUM_METHODS); +} + +static inline bool +lv2_canvas_render(LV2_Canvas *canvas, cairo_t *ctx, const LV2_Atom_Tuple *tup) +{ + LV2_Canvas_URID *urid = &canvas->urid; + + if(!tup || (tup->atom.type != urid->forge.Tuple) ) + return false; + + // save state + cairo_save(ctx); + + // clear surface + cairo_set_operator(ctx, CAIRO_OPERATOR_CLEAR); + cairo_paint(ctx); + + // default attributes + cairo_set_operator(ctx, CAIRO_OPERATOR_SOURCE); + cairo_set_font_size(ctx, 0.1); + cairo_set_line_width(ctx, 0.01); + cairo_set_source_rgba(ctx, 1.0, 1.0, 1.0, 1.0); + + LV2_ATOM_TUPLE_FOREACH(tup, itm) + { + if(lv2_atom_forge_is_object_type(&urid->forge, itm->type)) + { + const LV2_Atom_Object *obj = (const LV2_Atom_Object *)itm; + const LV2_Atom *body = NULL; + + lv2_atom_object_get(obj, urid->Canvas_body, &body, 0); + + LV2_Canvas_Meth *meth = _lv2_canvas_bsearch(obj->body.otype, + canvas->methods, LV2_CANVAS_NUM_METHODS); + + if(meth) + { + meth->func(ctx, urid, body); + } + } + } + + // save state + cairo_restore(ctx); + + // flush + cairo_surface_t *surface = cairo_get_target(ctx); + cairo_surface_flush(surface); + + return true; +} + +#ifdef __cplusplus +} +#endif + +#endif // CANVAS_IMPLEMENTATION |