#include #include #include #include #include #include #include #include #include "Image.h" #ifndef NDEBUG #define SIZECHECK(x, y) check_bounds((x), (y), m_width, m_height) #else #define SIZECHECK(x, y) do {} while(0) #endif // ARGB but with inverted alpha static inline int color2int(Color c) { u8 a = 255 - c.a; return (a << 24) | (c.r << 16) | (c.g << 8) | c.b; } static inline Color int2color(int c) { Color c2; u8 a; c2.b = c & 0xff; c2.g = (c >> 8) & 0xff; c2.r = (c >> 16) & 0xff; a = (c >> 24) & 0xff; c2.a = 255 - a; return c2; } static inline void check_bounds(int x, int y, int width, int height) { if(x < 0 || x >= width) { std::ostringstream oss; oss << "Access outside image bounds (x), 0 < " << x << " < " << width << " is false."; throw std::out_of_range(oss.str()); } if(y < 0 || y >= height) { std::ostringstream oss; oss << "Access outside image bounds (y), 0 < " << y << " < " << height << " is false."; throw std::out_of_range(oss.str()); } } Image::Image(int width, int height) : m_width(width), m_height(height), m_image(NULL) { m_image = gdImageCreateTrueColor(m_width, m_height); } Image::~Image() { gdImageDestroy(m_image); } void Image::setPixel(int x, int y, const Color &c) { SIZECHECK(x, y); m_image->tpixels[y][x] = color2int(c); } Color Image::getPixel(int x, int y) { SIZECHECK(x, y); return int2color(m_image->tpixels[y][x]); } void Image::drawLine(int x1, int y1, int x2, int y2, const Color &c) { SIZECHECK(x1, y1); SIZECHECK(x2, y2); gdImageLine(m_image, x1, y1, x2, y2, color2int(c)); } void Image::drawText(int x, int y, const std::string &s, const Color &c) { SIZECHECK(x, y); gdImageString(m_image, gdFontGetMediumBold(), x, y, (unsigned char*) s.c_str(), color2int(c)); } void Image::drawFilledRect(int x, int y, int w, int h, const Color &c) { SIZECHECK(x, y); SIZECHECK(x + w - 1, y + h - 1); gdImageFilledRectangle(m_image, x, y, x + w - 1, y + h - 1, color2int(c)); } void Image::drawCircle(int x, int y, int diameter, const Color &c) { SIZECHECK(x, y); gdImageArc(m_image, x, y, diameter, diameter, 0, 360, color2int(c)); } void Image::save(const std::string &filename) { FILE *f = fopen(filename.c_str(), "wb"); if(!f) { std::ostringstream oss; oss << "Error writing image file: " << std::strerror(errno); throw std::runtime_error(oss.str()); } gdImagePng(m_image, f); // other formats? fclose(f); }