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https://github.com/Hopiu/rpi-rgb-led-matrix.git
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74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
// -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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// Very simple graphics library to do simple things.
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//
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// Might be useful to consider using Cairo instead and just have an interface
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// between that and the Canvas. Well, this is a quick set of things to get
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// started (and nicely self-contained).
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#ifndef RPI_GRAPHICS_H
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#define RPI_GRAPHICS_H
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#include "canvas.h"
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#include <map>
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#include <stdint.h>
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namespace rgb_matrix {
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struct Color {
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Color(uint8_t rr, uint8_t gg, uint8_t bb) : r(rr), g(gg), b(bb) {}
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uint8_t r;
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uint8_t g;
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uint8_t b;
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};
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// Font loading bdf files. If this ever becomes more types, just make virtual
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// base class.
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class Font {
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public:
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// Initialize font, but it is only usable after LoadFont() has been called.
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Font();
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~Font();
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bool LoadFont(const char *path);
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// Return height of font in pixels. Returns -1 if font has not been loaded.
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int height() const { return font_height_; }
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// Return baseline. Pixels from the topline to the baseline.
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int baseline() const { return base_line_; }
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// Return width of given character, or -1 if font is not loaded or character
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// does not exist.
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int CharacterWidth(uint32_t unicode_codepoint) const;
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// Draws the unicode character at position "x","y" with "color". The "y"
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// position is the baseline of the font.
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// If we don't have it in the font, draws the replacement character "<22>" if
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// available.
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// Returns how much we advance on the screen, which is the width of the
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// character or 0 if we didn't draw any chracter.
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int DrawGlyph(Canvas *c, int x, int y, const Color &color,
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uint32_t unicode_codepoint) const;
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private:
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struct Glyph;
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typedef std::map<uint32_t, Glyph*> CodepointGlyphMap;
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const Glyph *FindGlyph(uint32_t codepoint) const;
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int font_height_;
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int base_line_;
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CodepointGlyphMap glyphs_;
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};
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// -- Some utility functions.
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// Draw text, encoded in utf8, with given "font" at "x","y" with "color".
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// Returns how far we advance on the screen.
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int DrawText(Canvas *c, const Font &font,
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int x, int y, const Color &color,
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const char *utf8_text);
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// lines, circles and stuff.
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} // namespace rgb_matrix
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#endif // RPI_GRAPHICS_H
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