mirror of
https://github.com/moparisthebest/minetest
synced 2024-12-22 23:58:48 -05:00
170 lines
5.7 KiB
C++
170 lines
5.7 KiB
C++
/*
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Copyright (C) 2015 Aaron Suen <warr1024@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "guiscalingfilter.h"
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#include "imagefilters.h"
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#include "settings.h"
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#include "util/numeric.h"
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#include <stdio.h>
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/* Maintain a static cache to store the images that correspond to textures
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* in a format that's manipulable by code. Some platforms exhibit issues
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* converting textures back into images repeatedly, and some don't even
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* allow it at all.
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*/
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std::map<io::path, video::IImage *> g_imgCache;
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/* Maintain a static cache of all pre-scaled textures. These need to be
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* cleared as well when the cached images.
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*/
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std::map<io::path, video::ITexture *> g_txrCache;
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/* Manually insert an image into the cache, useful to avoid texture-to-image
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* conversion whenever we can intercept it.
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*/
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void guiScalingCache(io::path key, video::IVideoDriver *driver, video::IImage *value)
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{
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if (!g_settings->getBool("gui_scaling_filter"))
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return;
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video::IImage *copied = driver->createImage(value->getColorFormat(),
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value->getDimension());
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value->copyTo(copied);
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g_imgCache[key] = copied;
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}
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// Manually clear the cache, e.g. when switching to different worlds.
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void guiScalingCacheClear(video::IVideoDriver *driver)
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{
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for (std::map<io::path, video::IImage *>::iterator it = g_imgCache.begin();
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it != g_imgCache.end(); ++it) {
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if (it->second != NULL)
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it->second->drop();
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}
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g_imgCache.clear();
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for (std::map<io::path, video::ITexture *>::iterator it = g_txrCache.begin();
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it != g_txrCache.end(); ++it) {
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if (it->second != NULL)
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driver->removeTexture(it->second);
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}
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g_txrCache.clear();
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}
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/* Get a cached, high-quality pre-scaled texture for display purposes. If the
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* texture is not already cached, attempt to create it. Returns a pre-scaled texture,
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* or the original texture if unable to pre-scale it.
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*/
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video::ITexture *guiScalingResizeCached(video::IVideoDriver *driver,
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video::ITexture *src, const core::rect<s32> &srcrect,
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const core::rect<s32> &destrect)
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{
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if (src == NULL)
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return src;
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if (!g_settings->getBool("gui_scaling_filter"))
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return src;
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// Calculate scaled texture name.
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char rectstr[200];
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snprintf(rectstr, sizeof(rectstr), "%d:%d:%d:%d:%d:%d",
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srcrect.UpperLeftCorner.X,
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srcrect.UpperLeftCorner.Y,
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srcrect.getWidth(),
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srcrect.getHeight(),
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destrect.getWidth(),
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destrect.getHeight());
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io::path origname = src->getName().getPath();
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io::path scalename = origname + "@guiScalingFilter:" + rectstr;
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// Search for existing scaled texture.
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video::ITexture *scaled = g_txrCache[scalename];
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if (scaled)
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return scaled;
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// Try to find the texture converted to an image in the cache.
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// If the image was not found, try to extract it from the texture.
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video::IImage* srcimg = g_imgCache[origname];
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if (srcimg == NULL) {
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if (!g_settings->getBool("gui_scaling_filter_txr2img"))
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return src;
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srcimg = driver->createImageFromData(src->getColorFormat(),
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src->getSize(), src->lock(), false);
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src->unlock();
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g_imgCache[origname] = srcimg;
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}
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// Create a new destination image and scale the source into it.
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imageCleanTransparent(srcimg, 0);
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video::IImage *destimg = driver->createImage(src->getColorFormat(),
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core::dimension2d<u32>((u32)destrect.getWidth(),
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(u32)destrect.getHeight()));
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imageScaleNNAA(srcimg, srcrect, destimg);
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#ifdef __ANDROID__
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// Android is very picky about textures being powers of 2, so expand
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// the image dimensions to the next power of 2, if necessary, for
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// that platform.
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video::IImage *po2img = driver->createImage(src->getColorFormat(),
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core::dimension2d<u32>(npot2((u32)destrect.getWidth()),
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npot2((u32)destrect.getHeight())));
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po2img->fill(video::SColor(0, 0, 0, 0));
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destimg->copyTo(po2img);
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destimg->drop();
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destimg = po2img;
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#endif
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// Convert the scaled image back into a texture.
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scaled = driver->addTexture(scalename, destimg, NULL);
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destimg->drop();
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g_txrCache[scalename] = scaled;
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return scaled;
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}
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/* Convenience wrapper for guiScalingResizeCached that accepts parameters that
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* are available at GUI imagebutton creation time.
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*/
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video::ITexture *guiScalingImageButton(video::IVideoDriver *driver,
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video::ITexture *src, s32 width, s32 height)
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{
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if (src == NULL)
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return src;
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return guiScalingResizeCached(driver, src,
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core::rect<s32>(0, 0, src->getSize().Width, src->getSize().Height),
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core::rect<s32>(0, 0, width, height));
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}
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/* Replacement for driver->draw2DImage() that uses the high-quality pre-scaled
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* texture, if configured.
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*/
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void draw2DImageFilterScaled(video::IVideoDriver *driver, video::ITexture *txr,
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const core::rect<s32> &destrect, const core::rect<s32> &srcrect,
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const core::rect<s32> *cliprect, const video::SColor *const colors,
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bool usealpha)
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{
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// Attempt to pre-scale image in software in high quality.
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video::ITexture *scaled = guiScalingResizeCached(driver, txr, srcrect, destrect);
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if (scaled == NULL)
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return;
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// Correct source rect based on scaled image.
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const core::rect<s32> mysrcrect = (scaled != txr)
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? core::rect<s32>(0, 0, destrect.getWidth(), destrect.getHeight())
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: srcrect;
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driver->draw2DImage(scaled, destrect, mysrcrect, cliprect, colors, usealpha);
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}
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