212 lines
7.9 KiB
C
212 lines
7.9 KiB
C
/************************************************************//**
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*
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* @file: graphics.h
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* @author: Martin Fouilleul
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* @date: 23/01/2023
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* @revision:
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*
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*****************************************************************/
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#ifndef __GRAPHICS_H_
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#define __GRAPHICS_H_
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//------------------------------------------------------------------------------------------
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//NOTE(martin): graphics surface
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//------------------------------------------------------------------------------------------
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typedef struct mg_surface { u64 h; } mg_surface;
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mg_surface mg_surface_nil();
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bool mg_surface_is_nil(mg_surface surface);
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void mg_surface_destroy(mg_surface surface);
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void mg_surface_prepare(mg_surface surface);
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void mg_surface_present(mg_surface surface);
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void mg_surface_swap_interval(mg_surface surface, int swap);
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mp_rect mg_surface_get_frame(mg_surface surface);
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void mg_surface_set_frame(mg_surface surface, mp_rect frame);
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bool mg_surface_get_hidden(mg_surface surface);
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void mg_surface_set_hidden(mg_surface surface, bool hidden);
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//------------------------------------------------------------------------------------------
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//NOTE(martin): graphics canvas structs
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//------------------------------------------------------------------------------------------
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typedef struct mg_canvas { u64 h; } mg_canvas;
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typedef struct mg_stream { u64 h; } mg_stream;
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typedef struct mg_font { u64 h; } mg_font;
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typedef struct mg_mat2x3
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{
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f32 m[6];
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} mg_mat2x3;
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typedef struct mg_color
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{
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union
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{
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struct
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{
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f32 r;
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f32 g;
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f32 b;
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f32 a;
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};
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f32 c[4];
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};
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} mg_color;
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typedef enum {MG_JOINT_MITER = 0,
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MG_JOINT_BEVEL,
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MG_JOINT_NONE } mg_joint_type;
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typedef enum {MG_CAP_NONE = 0,
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MG_CAP_SQUARE } mg_cap_type;
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typedef struct mg_font_extents
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{
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f32 ascent; // the extent above the baseline (by convention a positive value extends above the baseline)
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f32 descent; // the extent below the baseline (by convention, positive value extends below the baseline)
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f32 leading; // spacing between one row's descent and the next row's ascent
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f32 xHeight; // height of the lower case letter 'x'
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f32 capHeight; // height of the upper case letter 'M'
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f32 width; // maximum width of the font
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} mg_font_extents;
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typedef struct mg_text_extents
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{
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f32 xBearing;
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f32 yBearing;
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f32 width;
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f32 height;
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f32 xAdvance;
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f32 yAdvance;
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} mg_text_extents;
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//------------------------------------------------------------------------------------------
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//NOTE(martin): graphics canvas
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//------------------------------------------------------------------------------------------
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mg_canvas mg_canvas_create(mg_surface surface);
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void mg_canvas_destroy(mg_canvas canvas);
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mg_canvas mg_canvas_set_current(mg_canvas canvas);
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void mg_flush();
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//------------------------------------------------------------------------------------------
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//NOTE(martin): transform, viewport and clipping
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//------------------------------------------------------------------------------------------
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void mg_viewport(mp_rect viewPort);
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void mg_matrix_push(mg_mat2x3 matrix);
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void mg_matrix_pop();
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void mg_clip_push(f32 x, f32 y, f32 w, f32 h);
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void mg_clip_pop();
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//------------------------------------------------------------------------------------------
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//NOTE(martin): graphics attributes setting/getting
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//------------------------------------------------------------------------------------------
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void mg_set_color(mg_color color);
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void mg_set_color_rgba(f32 r, f32 g, f32 b, f32 a);
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void mg_set_width(f32 width);
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void mg_set_tolerance(f32 tolerance);
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void mg_set_joint(mg_joint_type joint);
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void mg_set_max_joint_excursion(f32 maxJointExcursion);
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void mg_set_cap(mg_cap_type cap);
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void mg_set_font(mg_font font);
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void mg_set_font_size(f32 size);
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void mg_set_text_flip(bool flip);
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mg_color mg_get_color();
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f32 mg_get_width();
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f32 mg_get_tolerance();
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mg_joint_type mg_get_joint();
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f32 mg_get_max_joint_excursion();
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mg_cap_type mg_get_cap();
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mg_font mg_get_font();
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f32 mg_get_font_size();
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bool mg_get_text_flip();
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//------------------------------------------------------------------------------------------
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//NOTE(martin): path construction
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//------------------------------------------------------------------------------------------
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vec2 mg_get_position();
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void mg_move_to(f32 x, f32 y);
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void mg_line_to(f32 x, f32 y);
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void mg_quadratic_to(f32 x1, f32 y1, f32 x2, f32 y2);
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void mg_cubic_to(f32 x1, f32 y1, f32 x2, f32 y2, f32 x3, f32 y3);
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void mg_close_path();
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mp_rect mg_glyph_outlines(str32 glyphIndices);
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void mg_codepoints_outlines(str32 string);
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void mg_text_outlines(str8 string);
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//------------------------------------------------------------------------------------------
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//NOTE(martin): clear/fill/stroke
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//------------------------------------------------------------------------------------------
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void mg_clear();
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void mg_fill();
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void mg_stroke();
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//------------------------------------------------------------------------------------------
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//NOTE(martin): 'fast' shapes primitives
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//------------------------------------------------------------------------------------------
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void mg_rectangle_fill(f32 x, f32 y, f32 w, f32 h);
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void mg_rectangle_stroke(f32 x, f32 y, f32 w, f32 h);
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void mg_rounded_rectangle_fill(f32 x, f32 y, f32 w, f32 h, f32 r);
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void mg_rounded_rectangle_stroke(f32 x, f32 y, f32 w, f32 h, f32 r);
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void mg_ellipse_fill(f32 x, f32 y, f32 rx, f32 ry);
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void mg_ellipse_stroke(f32 x, f32 y, f32 rx, f32 ry);
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void mg_circle_fill(f32 x, f32 y, f32 r);
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void mg_circle_stroke(f32 x, f32 y, f32 r);
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void mg_arc(f32 x, f32 y, f32 r, f32 arcAngle, f32 startAngle);
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//------------------------------------------------------------------------------------------
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//NOTE(martin): fonts
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//------------------------------------------------------------------------------------------
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mg_font mg_font_nil();
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mg_font mg_font_create_from_memory(u32 size, byte* buffer, u32 rangeCount, unicode_range* ranges);
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void mg_font_destroy(mg_font font);
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//NOTE(martin): the following int valued functions return -1 if font is invalid or codepoint is not present in font//
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//TODO(martin): add enum error codes
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mg_font_extents mg_font_get_extents(mg_font font);
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mg_font_extents mg_font_get_scaled_extents(mg_font font, f32 emSize);
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f32 mg_font_get_scale_for_em_pixels(mg_font font, f32 emSize);
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//NOTE(martin): if you need to process more than one codepoint, first convert your codepoints to glyph indices, then use the
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// glyph index versions of the functions, which can take an array of glyph indices.
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str32 mg_font_get_glyph_indices(mg_font font, str32 codePoints, str32 backing);
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str32 mg_font_push_glyph_indices(mg_font font, mem_arena* arena, str32 codePoints);
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u32 mg_font_get_glyph_index(mg_font font, utf32 codePoint);
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int mg_font_get_codepoint_extents(mg_font font, utf32 codePoint, mg_text_extents* outExtents);
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int mg_font_get_glyph_extents(mg_font font, str32 glyphIndices, mg_text_extents* outExtents);
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mp_rect mg_text_bounding_box_utf32(mg_font font, f32 fontSize, str32 text);
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mp_rect mg_text_bounding_box(mg_font font, f32 fontSize, str8 text);
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//------------------------------------------------------------------------------------------
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//NOTE(martin): images
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//------------------------------------------------------------------------------------------
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typedef struct mg_image { u64 h; } mg_image;
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mg_image mg_image_nil();
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bool mg_image_equal(mg_image a, mg_image b);
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mg_image mg_image_create_from_rgba8(u32 width, u32 height, u8* pixels);
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mg_image mg_image_create_from_data(str8 data, bool flip);
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mg_image mg_image_create_from_file(str8 path, bool flip);
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void mg_image_drestroy(mg_image image);
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vec2 mg_image_size(mg_image image);
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void mg_image_draw(mg_image image, mp_rect rect);
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void mg_rounded_image_draw(mg_image image, mp_rect rect, f32 roundness);
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#endif //__GRAPHICS_H_
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