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#include "tile_page.h"
#include "tile_colour.h"
#include "tile.h"
#include <png.h>
static bool write_png(const char *filename, tile_colour *pixels,
int width, int height)
{
FILE *fp = fopen(filename, "wb");
if (!fp)
{
fprintf(stderr, "Error: Can't open file '%s' for write.\n", filename);
return false;
}
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (!png_ptr)
return false;
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
return false;
}
png_init_io(png_ptr, fp);
int bit_depth = 8;
int colour_type = PNG_COLOR_TYPE_RGB_ALPHA;
int interlace_type = PNG_INTERLACE_NONE;
int compression_type = PNG_COMPRESSION_TYPE_DEFAULT;
int filter_method = PNG_FILTER_TYPE_DEFAULT;
png_set_IHDR(png_ptr, info_ptr, width, height,
bit_depth, colour_type, interlace_type,
compression_type, filter_method);
png_bytep* row_pointers = (png_bytep*)malloc(sizeof(png_bytep) * height);
for (unsigned int y = 0; y < height; y++)
row_pointers[y] = (png_byte*)&pixels[y * width];
png_set_rows(png_ptr, info_ptr, row_pointers);
int png_transforms = PNG_TRANSFORM_IDENTITY;
png_write_png(png_ptr, info_ptr, png_transforms, NULL);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
free(row_pointers);
fclose(fp);
return true;
}
tile_page::tile_page() : m_width(1024), m_height(0)
{
}
tile_page::~tile_page()
{
for (unsigned int i = 0; i < m_tiles.size(); i++)
{
delete m_tiles[i];
}
m_tiles.clear();
m_counts.clear();
}
bool tile_page::place_images()
{
// locate all the tiles on the page, so we can determine its size
// and the tex coords.
m_offsets.clear();
m_texcoords.clear();
int ymin, ycur, ymax;
int xmin, xcur, xmax;
ymin = ycur = ymax = xmin = xcur = xmax = 0;
for (unsigned int i = 0; i < m_tiles.size(); i++)
{
int ofs_x, ofs_y, tilew, tileh;
if (m_tiles[i]->shrink())
{
m_tiles[i]->get_bounding_box(ofs_x, ofs_y, tilew, tileh);
}
else
{
ofs_x = 0;
ofs_y = 0;
tilew = m_tiles[i]->width();
tileh = m_tiles[i]->height();
}
m_offsets.push_back(ofs_x);
m_offsets.push_back(ofs_y);
m_offsets.push_back(m_tiles[i]->width());
m_offsets.push_back(m_tiles[i]->height());
if (xcur + tilew > m_width)
{
ycur = ymin = ymax;
xcur = xmin = xmax = 0;
}
if (tileh + ycur >= ymax)
{
if (ycur != ymin)
{
ycur = ymin;
xcur = xmax;
xmin = xmax = xcur;
}
if (xcur + tilew > m_width)
{
ycur = ymin = ymax;
xcur = xmin = xmax = 0;
}
if (ycur == ymin)
{
ymax = std::max(ymin + (int)tileh, ymax);
}
}
m_height = ymax;
m_texcoords.push_back(xcur);
m_texcoords.push_back(ycur);
m_texcoords.push_back(xcur + tilew);
m_texcoords.push_back(ycur + tileh);
// Only add downwards, stretching out xmax as we go.
xmax = std::max(xmax, xcur + (int)tilew);
xcur = xmin;
ycur += tileh;
}
return true;
}
bool tile_page::write_image(const char *filename)
{
if (m_width * m_height <= 0)
{
fprintf(stderr, "Error: failed to write image. No images placed?\n");
return false;
}
tile_colour *pixels = new tile_colour[m_width * m_height];
memset(pixels, 0, m_width * m_height * sizeof(tile_colour));
for (unsigned int i = 0; i < m_tiles.size(); i++)
{
int sx = m_texcoords[i*4];
int sy = m_texcoords[i*4+1];
int ex = m_texcoords[i*4+2];
int ey = m_texcoords[i*4+3];
int wx = ex - sx;
int wy = ey - sy;
int ofs_x = m_offsets[i*4];
int ofs_y = m_offsets[i*4+1];
for (int y = 0; y < wy; y++)
{
for (int x = 0; x < wx; x++)
{
tile_colour &dest = pixels[(sx+x) + (sy+y)*m_width];
tile_colour &src = m_tiles[i]->get_pixel(ofs_x+x, ofs_y+y);
dest = src;
}
}
}
bool success = write_png(filename, pixels, m_width, m_height);
delete[] pixels;
return success;
}
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