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renderer.cpp
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renderer.cpp
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#include "renderer.hpp"
#include <iostream>
#include <stdlib.h>
#include <errno.h>
#include <stdint.h>
#define PNG_SKIP_SETJMP_CHECK
#include <png.h>
#include "grid.hpp"
#include "color.hpp"
#include <iomanip>
void png_user_warn(png_structp ctx, png_const_charp str)
{
std::cerr << "libPNG warning: " << str << std::endl;
}
void png_user_error(png_structp ctx, png_const_charp str)
{
std::cerr << "libPNG error: " << str << std::endl;
exit(1);
}
void renderGlyph(FT_Face &face, int charCode)
{
int error;
error = FT_Load_Char(face, charCode, FT_LOAD_DEFAULT);
if(error)
{
std::cerr << "Could not find character in font face, code: " << error << std::endl;
exit(1);
}
error = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_LCD);
if(error)
{
std::cerr << "Could not render glyph, code: " << error << std::endl;
exit(1);
}
}
void drawGlyph(int* buffer, int bufferPitch, int originX, int originY, FT_GlyphSlot glyph, int fontSize, wanikani::Color colorIn)
{
FT_Bitmap bitmap = glyph->bitmap;
int glyphWidth = bitmap.width;
int glyphHeight = bitmap.rows;
int glyphPitch = bitmap.pitch;
int glyphLeft = glyph->bitmap_left;
int glyphTop = fontSize - glyph->bitmap_top;
for (int glyphX = 0; glyphX < glyphWidth / 3; glyphX++)
{
for (int glyphY = 0; glyphY < glyphHeight; glyphY++)
{
int glyphPos = glyphX*3 + glyphY * glyphPitch;
int bufferX = originX + glyphX + glyphLeft;
int bufferY = originY + glyphY + glyphTop;
int bufferPos = bufferX + bufferY * bufferPitch;
uint32_t r = bitmap.buffer[glyphPos + 2];
uint32_t g = bitmap.buffer[glyphPos + 1];
uint32_t b = bitmap.buffer[glyphPos + 0];
// TODO: HACK: Should not need to get alpha from RGB.
uint32_t a = (r + g + b) / 3;
wanikani::Color colorOut(r,g,b);
colorOut *= colorIn;
// Overlay alpha compositing
buffer[bufferPos] = ((colorOut * a) + wanikani::Color(buffer[bufferPos]) * (0xFF - a)).ABGR();
}
}
}
namespace wanikani
{
Renderer::Renderer(int width, int height, std::string fontName)
:width_(width)
,height_(height)
,marginLeft_(0)
,marginRight_(0)
,marginTop_(0)
,marginBottom_(0)
,buffer_(new int[width * height]())
{
int error = 0;
error = FT_Init_FreeType(&library_);
if(error)
{
std::cerr << "Failed to initialize freetype library, code: " << error << std::endl;
exit(1);
}
error = FT_New_Face(library_, fontName.c_str(), 0, &face_);
if(error)
{
std::cerr << "Failed to load font face: " << fontName << ", code: " << error << std::endl;
exit(1);
}
}
void Renderer::setMargins(int left, int right, int top, int bottom)
{
marginLeft_ = left;
marginRight_ = right;
marginTop_ = top;
marginBottom_ = bottom;
}
void Renderer::render(Order &order)
{
//Set background
for(int x = 0; x < width_; x++)
{
for(int y = 0; y < height_; y++)
{
int pos = x + (y * width_);
buffer_[pos] = colorBackground_.ABGR();
}
}
double width = width_ - marginLeft_ - marginRight_;
double height = height_ - marginTop_ - marginBottom_;
double ratio = width / height;
int w, h;
double wasted = grid::findBest(order.size(), ratio, w, h);
double contentRatio = double(w) / double(h);
double characterWidth = width / double(w);
double characterHeight = height / double(h);
int fontSize = contentRatio < ratio ? (int) characterHeight : (int) characterWidth;
FT_Select_Charmap(face_, ft_encoding_unicode);
FT_Set_Pixel_Sizes(face_, 0, fontSize);
for(int i = 0; i < order.size(); i++)
{
int gridX = (i % w) * characterWidth + marginLeft_;
int gridY = (i / w) * characterHeight + marginTop_;
renderGlyph(face_, order.kanji(i).character());
drawGlyph(buffer_, width_, gridX, gridY, face_->glyph, fontSize, SRSColor(order.kanji(i).SRS()));
}
}
void Renderer::save(std::string fileName)
{
FILE *file = fopen(fileName.c_str(), "wb");
if(file == NULL)
{
std::cerr << "Could not open " << fileName << " for writing, code: " << errno << std::endl;
exit(1);
}
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, png_user_error, png_user_warn);
png_infop info_ptr = png_create_info_struct(png_ptr);
setjmp(png_jmpbuf(png_ptr));
png_init_io(png_ptr, file);
png_set_IHDR(
png_ptr,
info_ptr,
width_,
height_,
8,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
png_bytep *row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height_ * 4);
for(int i = 0; i < height_; i++)
row_pointers[i] = (png_bytep)buffer_ + i * width_ * 4;
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
free(row_pointers);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(file);
}
void Renderer::setBackground(Color color) { colorBackground_ = color; }
void Renderer::setUnseen(Color color) { colorUnseen_ = color; }
void Renderer::setApprentice(Color color) { colorApprentice_ = color; }
void Renderer::setGuru(Color color) { colorGuru_ = color; }
void Renderer::setMaster(Color color) { colorMaster_ = color; }
void Renderer::setEnlightened(Color color) { colorEnlightened_ = color; }
void Renderer::setBurned(Color color) { colorBurned_ = color; }
void Renderer::setError(Color color) { colorError_ = color; }
Color Renderer::SRSColor(WaniKaniSRS srs)
{
switch(srs)
{
case SRS_UNSEEN:
return colorUnseen_;
case SRS_APPRENTICE:
return colorApprentice_;
case SRS_GURU:
return colorGuru_;
case SRS_MASTER:
return colorMaster_;
case SRS_ENLIGHTENED:
return colorEnlightened_;
case SRS_BURNED:
return colorBurned_;
default:
return colorError_;
}
}
}