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improve rescale_texture() and consider_rescale() when loading texture from in-memory PNMImage

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This commit is contained in:
David Rose 2012-05-10 13:46:08 +00:00
parent aee35023f0
commit 78e72288ad
1 changed files with 25 additions and 7 deletions
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32
panda/src/gobj/texture.cxx
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@ -1878,9 +1878,12 @@ down_to_power_2(int value) {
// the image, according to the whims of the Config.prc
// file.
//
// This method should be called after
// pnmimage.read_header() has been called, but before
// pnmimage.read(). Also see rescale_texture().
// For most efficient results, this method should be
// called after pnmimage.read_header() has been called,
// but before pnmimage.read(). This method may also be
// called after pnmimage.read(), i.e. when the pnmimage
// is already loaded; in this case it will rescale the
// image on the spot. Also see rescale_texture().
////////////////////////////////////////////////////////////////////
void Texture::
consider_rescale(PNMImage &pnmimage) {
@ -1894,16 +1897,29 @@ consider_rescale(PNMImage &pnmimage) {
// the image, according to the whims of the Config.prc
// file.
//
// This method should be called after
// pnmimage.read_header() has been called, but before
// pnmimage.read(). Also see rescale_texture().
// For most efficient results, this method should be
// called after pnmimage.read_header() has been called,
// but before pnmimage.read(). This method may also be
// called after pnmimage.read(), i.e. when the pnmimage
// is already loaded; in this case it will rescale the
// image on the spot. Also see rescale_texture().
////////////////////////////////////////////////////////////////////
void Texture::
consider_rescale(PNMImage &pnmimage, const string &name, AutoTextureScale auto_texture_scale) {
int new_x_size = pnmimage.get_x_size();
int new_y_size = pnmimage.get_y_size();
if (adjust_size(new_x_size, new_y_size, name, false, auto_texture_scale)) {
pnmimage.set_read_size(new_x_size, new_y_size);
if (pnmimage.is_valid()) {
// The image is already loaded. Rescale on the spot.
PNMImage new_image(new_x_size, new_y_size, pnmimage.get_num_channels(),
pnmimage.get_maxval());
new_image.quick_filter_from(pnmimage);
pnmimage.take_from(new_image);
} else {
// Rescale while reading. Some image types (e.g. jpeg) can take
// advantage of this.
pnmimage.set_read_size(new_x_size, new_y_size);
}
}
}
@ -4579,6 +4595,8 @@ do_rescale_texture(CData *cdata) {
do_clear_ram_image(cdata);
++(cdata->_image_modified);
cdata->_x_size = new_x_size;
cdata->_y_size = new_y_size;
if (!do_load_one(cdata, new_image, get_name(), 0, 0, LoaderOptions())) {
return false;
}