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