void PLTFile::build() {
/* For all layers, copy one whole row of pixels into the row buffer.
* The row picked for each layer corresponds to the color index we want.
* We don't care about the other rows, as they belong to other color indices. */
byte rows[4 * 256 * kLayerMAX];
getColorRows(rows, _colors);
const uint32 pixels = _width * _height;
const uint8 *image = _dataImage;
const uint8 *layer = _dataLayers;
byte *dst = _surface->getData();
/* Now terate over all pixels, each time copying the correct BGRA values
* for the pixel's intensity into the final image. */
for (uint32 i = 0; i < pixels; i++, image++, layer++, dst += 4)
memcpy(dst, rows + (*layer * 4 * 256) + (*image * 4), 4);
}
void PLTImage::create(const PLTFile &parent) {
_mipMaps.push_back(new MipMap);
_mipMaps[0]->width = parent._width;
_mipMaps[0]->height = parent._height;
_mipMaps[0]->size = _mipMaps[0]->width * _mipMaps[0]->height * 4;
_mipMaps[0]->data = new byte[_mipMaps[0]->size];
byte rows[4 * 256 * PLTFile::kLayerMAX];
getColorRows(parent, rows);
uint32 pixels = parent._width * parent._height;
const byte *image = parent._dataImage;
const byte *layer = parent._dataLayers;
byte *dst = _mipMaps[0]->data;
for (uint32 i = 0; i < pixels; i++, image++, layer++, dst += 4)
memcpy(dst, rows + (*layer * 4 * 256) + (*image * 4), 4);
}
