void testPNG()
{
RGBAImage img;
img.create(100, 100);
for (vector<RGBAPixel>::iterator it = img.data.begin(); it != img.data.end(); it++)
{
*it = ((rand() % 256) << 24) | ((rand() % 256) << 16) | ((rand() % 256) << 8) | (rand() % 256);
}
img.writePNG("test.png");
RGBAImage img2;
img2.readPNG("test.png");
if (img2.data != img.data)
cout << "images don't match after trip through PNG!" << endl;
else
cout << "PNG test successful" << endl;
}
bool expandMap(const string& outputpath)
{
// read old params
MapParams mp;
if (!mp.readFile(outputpath))
{
cerr << "pigmap.params missing or corrupt" << endl;
return false;
}
int32_t tileSize = mp.tileSize();
// to expand a map, the following must be done:
// 1. the top-left quadrant of the current zoom level 1 needs to be moved to zoom level 2, where
// it will become the bottom-right quadrant of the top-left quadrant of the new zoom level 1,
// so the top-level file "0.png" and subdirectory "0" must become "0/3.png" and "0/3",
// respectively; and similarly for the other three quadrants
// 2. new zoom level 1 tiles must be created: "0.png" is 3/4 empty, but has a shrunk version of
// the old "0.png" (which is the new "0/3.png") in its bottom-right, etc.
// 3. a new "base.png" must be created from the new zoom level 1 tiles
// move everything at zoom 1 or higher one level deeper
// ...first the subdirectories
renameFile(outputpath + "/0", outputpath + "/old0");
renameFile(outputpath + "/1", outputpath + "/old1");
renameFile(outputpath + "/2", outputpath + "/old2");
renameFile(outputpath + "/3", outputpath + "/old3");
makePath(outputpath + "/0");
makePath(outputpath + "/1");
makePath(outputpath + "/2");
makePath(outputpath + "/3");
renameFile(outputpath + "/old0", outputpath + "/0/3");
renameFile(outputpath + "/old1", outputpath + "/1/2");
renameFile(outputpath + "/old2", outputpath + "/2/1");
renameFile(outputpath + "/old3", outputpath + "/3/0");
// ...now the zoom 1 files
renameFile(outputpath + "/0.png", outputpath + "/0/3.png");
renameFile(outputpath + "/1.png", outputpath + "/1/2.png");
renameFile(outputpath + "/2.png", outputpath + "/2/1.png");
renameFile(outputpath + "/3.png", outputpath + "/3/0.png");
// build the new zoom 1 tiles
RGBAImage old0img;
bool used0 = old0img.readPNG(outputpath + "/0/3.png");
RGBAImage new0img;
new0img.create(tileSize, tileSize);
if (used0)
{
reduceHalf(new0img, ImageRect(tileSize/2, tileSize/2, tileSize/2, tileSize/2), old0img);
new0img.writePNG(outputpath + "/0.png");
}
RGBAImage old1img;
bool used1 = old1img.readPNG(outputpath + "/1/2.png");
RGBAImage new1img;
new1img.create(tileSize, tileSize);
if (used1)
{
reduceHalf(new1img, ImageRect(0, tileSize/2, tileSize/2, tileSize/2), old1img);
new1img.writePNG(outputpath + "/1.png");
}
RGBAImage old2img;
bool used2 = old2img.readPNG(outputpath + "/2/1.png");
RGBAImage new2img;
new2img.create(tileSize, tileSize);
if (used2)
{
reduceHalf(new2img, ImageRect(tileSize/2, 0, tileSize/2, tileSize/2), old2img);
new2img.writePNG(outputpath + "/2.png");
}
RGBAImage old3img;
bool used3 = old3img.readPNG(outputpath + "/3/0.png");
RGBAImage new3img;
new3img.create(tileSize, tileSize);
if (used3)
{
reduceHalf(new3img, ImageRect(0, 0, tileSize/2, tileSize/2), old3img);
new3img.writePNG(outputpath + "/3.png");
}
// build the new base tile
RGBAImage newbase;
newbase.create(tileSize, tileSize);
if (used0)
reduceHalf(newbase, ImageRect(0, 0, tileSize/2, tileSize/2), new0img);
if (used1)
reduceHalf(newbase, ImageRect(tileSize/2, 0, tileSize/2, tileSize/2), new1img);
if (used2)
reduceHalf(newbase, ImageRect(0, tileSize/2, tileSize/2, tileSize/2), new2img);
if (used3)
reduceHalf(newbase, ImageRect(tileSize/2, tileSize/2, tileSize/2, tileSize/2), new3img);
newbase.writePNG(outputpath + "/base.png");
// write new params (with incremented baseZoom)
mp.baseZoom++;
mp.writeFile(outputpath);
// touch all tiles, to prevent browser cache mishaps (since many new tiles will have the same
// filename as some old tile, but possibly with an earlier timestamp)
system((string("find ") + outputpath + " -exec touch {} +").c_str());
return true;
}