130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
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#ifndef __HQN_SURFACE_H__
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#define __HQN_SURFACE_H__
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#include <SDL_surface.h>
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#include "hqn.h"
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#include <cstdint>
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namespace hqn
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{
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extern const float pi;
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float fastSin(float x);
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float fastCos(float x);
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struct Color
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{
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union
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{
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struct { uint8_t r, g, b, a; };
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uint32_t bits;
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};
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};
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enum BlendMode
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{
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HQN_BLENDMODE_NONE,
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HQN_BLENDMODE_BLEND,
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HQN_BLENDMODE_ADD,
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HQN_BLENDMODE_MOD,
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};
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/**
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* A surface which provides drawing operations.
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* The format is always RGBA.
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*/
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class Surface
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{
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public:
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#define HQN_DEFAULT_PTSIZE 12
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typedef Color (*BlendFunction)(Color src, Color dst);
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Surface(size_t width, size_t height);
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~Surface();
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inline int getWidth() const
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{ return m_width; }
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inline int getHeight() const
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{ return m_height; }
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void drawRect(int x, int y, size_t w, size_t h, Color color);
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void fillRect(int x, int y, size_t w, size_t h, Color fg, Color bg);
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void drawCircle(int x, int y, size_t radius, Color color);
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void fillCircle(int x, int y, size_t radius, Color fg, Color bg);
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void drawOval(int x, int y, size_t w, size_t h, Color color);
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void fillOval(int x, int y, size_t w, size_t h, Color fg, Color bg);
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/**
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* Draw a line. If the line goes outside the edges of the screen it will
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* not be drawn.
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*/
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void fastLine(int x1, int y1, int x2, int y2, Color color);
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/**
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* Slower than fastLine but will still draw lines which are partially
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* offscreen. Note that safeLine is likely significantly slower than
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* fastLine because it checks if each pixel is in bounds.
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*/
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void safeLine(int x1, int y1, int x2, int y2, Color color);
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/**
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* Set all pixels in the surface to the given color.
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*/
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void clear(Color color);
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void setPixel(int x, int y, Color color);
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int32_t getPixel(int x, int y);
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/**
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* Get a reference to the pixels.
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*/
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inline Color *getPixels() const
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{ return m_pixels; }
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inline size_t getDataSize() const
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{ return m_width * m_height * 4; }
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void setBlendMode(BlendMode mode);
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BlendMode getBlendMode() const;
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private:
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//////////////////
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// Private Data //
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//////////////////
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// RGBA formatted pixels
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Color *m_pixels;
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SDL_Surface *m_surface;
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int m_width;
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int m_height;
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BlendMode m_blend;
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BlendFunction m_blendFunc;
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// Set the pixel directly. Performs blending.
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// Inlined because it's small and more efficient to inline it.
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inline void rawset(int x, int y, Color src)
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{
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// Yay for no branching
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Color *destPtr = &m_pixels[x + y * m_width];
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*destPtr = m_blendFunc(src, *destPtr);
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}
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void line(int x1, int y1, int x2, int y2, Color color);
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// Blend functions
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static Color blendNone(Color, Color);
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static Color blendBlend(Color, Color);
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static Color blendAdd(Color, Color);
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static Color blendMod(Color, Color);
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};
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}
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#endif
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