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/*
Copyright (C) 2015 Aaron Suen <warr1024@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "guiscalingfilter.h"
#include "imagefilters.h"
#include "settings.h"
#include "util/numeric.h"
#include <stdio.h>
/* Maintain a static cache to store the images that correspond to textures
* in a format that's manipulable by code. Some platforms exhibit issues
* converting textures back into images repeatedly, and some don't even
* allow it at all.
*/
std::map<io::path, video::IImage *> g_imgCache;
/* Maintain a static cache of all pre-scaled textures. These need to be
* cleared as well when the cached images.
*/
std::map<io::path, video::ITexture *> g_txrCache;
/* Manually insert an image into the cache, useful to avoid texture-to-image
* conversion whenever we can intercept it.
*/
void guiScalingCache(io::path key, video::IVideoDriver *driver, video::IImage *value)
{
if (!g_settings->getBool("gui_scaling_filter"))
return;
video::IImage *copied = driver->createImage(value->getColorFormat(),
value->getDimension());
value->copyTo(copied);
g_imgCache[key] = copied;
}
// Manually clear the cache, e.g. when switching to different worlds.
void guiScalingCacheClear(video::IVideoDriver *driver)
{
for (std::map<io::path, video::IImage *>::iterator it = g_imgCache.begin();
it != g_imgCache.end(); it++) {
if (it->second != NULL)
it->second->drop();
}
g_imgCache.clear();
for (std::map<io::path, video::ITexture *>::iterator it = g_txrCache.begin();
it != g_txrCache.end(); it++) {
if (it->second != NULL)
driver->removeTexture(it->second);
}
g_txrCache.clear();
}
/* Get a cached, high-quality pre-scaled texture for display purposes. If the
* texture is not already cached, attempt to create it. Returns a pre-scaled texture,
* or the original texture if unable to pre-scale it.
*/
video::ITexture *guiScalingResizeCached(video::IVideoDriver *driver,
video::ITexture *src, const core::rect<s32> &srcrect,
const core::rect<s32> &destrect)
{
if (src == NULL)
return src;
if (!g_settings->getBool("gui_scaling_filter"))
return src;
// Calculate scaled texture name.
char rectstr[200];
snprintf(rectstr, sizeof(rectstr), "%d:%d:%d:%d:%d:%d",
srcrect.UpperLeftCorner.X,
srcrect.UpperLeftCorner.Y,
srcrect.getWidth(),
srcrect.getHeight(),
destrect.getWidth(),
destrect.getHeight());
io::path origname = src->getName().getPath();
io::path scalename = origname + "@guiScalingFilter:" + rectstr;
// Search for existing scaled texture.
video::ITexture *scaled = g_txrCache[scalename];
if (scaled)
return scaled;
// Try to find the texture converted to an image in the cache.
// If the image was not found, try to extract it from the texture.
video::IImage* srcimg = g_imgCache[origname];
if (srcimg == NULL) {
if (!g_settings->getBool("gui_scaling_filter_txr2img"))
return src;
srcimg = driver->createImageFromData(src->getColorFormat(),
src->getSize(), src->lock(), false);
src->unlock();
g_imgCache[origname] = srcimg;
}
// Create a new destination image and scale the source into it.
imageCleanTransparent(srcimg, 0);
video::IImage *destimg = driver->createImage(src->getColorFormat(),
core::dimension2d<u32>((u32)destrect.getWidth(),
(u32)destrect.getHeight()));
imageScaleNNAA(srcimg, srcrect, destimg);
#ifdef __ANDROID__
// Android is very picky about textures being powers of 2, so expand
// the image dimensions to the next power of 2, if necessary, for
// that platform.
video::IImage *po2img = driver->createImage(src->getColorFormat(),
core::dimension2d<u32>(npot2((u32)destrect.getWidth()),
npot2((u32)destrect.getHeight())));
po2img->fill(video::SColor(0, 0, 0, 0));
destimg->copyTo(po2img);
destimg->drop();
destimg = po2img;
#endif
// Convert the scaled image back into a texture.
scaled = driver->addTexture(scalename, destimg, NULL);
destimg->drop();
g_txrCache[scalename] = scaled;
return scaled;
}
/* Convenience wrapper for guiScalingResizeCached that accepts parameters that
* are available at GUI imagebutton creation time.
*/
video::ITexture *guiScalingImageButton(video::IVideoDriver *driver,
video::ITexture *src, s32 width, s32 height)
{
if (src == NULL)
return src;
return guiScalingResizeCached(driver, src,
core::rect<s32>(0, 0, src->getSize().Width, src->getSize().Height),
core::rect<s32>(0, 0, width, height));
}
/* Replacement for driver->draw2DImage() that uses the high-quality pre-scaled
* texture, if configured.
*/
void draw2DImageFilterScaled(video::IVideoDriver *driver, video::ITexture *txr,
const core::rect<s32> &destrect, const core::rect<s32> &srcrect,
const core::rect<s32> *cliprect, const video::SColor *const colors,
bool usealpha)
{
// Attempt to pre-scale image in software in high quality.
video::ITexture *scaled = guiScalingResizeCached(driver, txr, srcrect, destrect);
if (scaled == NULL)
return;
// Correct source rect based on scaled image.
const core::rect<s32> mysrcrect = (scaled != txr)
? core::rect<s32>(0, 0, destrect.getWidth(), destrect.getHeight())
: srcrect;
driver->draw2DImage(scaled, destrect, mysrcrect, cliprect, colors, usealpha);
}
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