src/guiscalingfilter.cpp

   1 /*
   2 Copyright (C) 2015 Aaron Suen <warr1024@gmail.com>
   3
   4 This program is free software; you can redistribute it and/or modify
   5 it under the terms of the GNU Lesser General Public License as published by
   6 the Free Software Foundation; either version 2.1 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU Lesser General Public License for more details.
  13
  14 You should have received a copy of the GNU Lesser General Public License along
  15 with this program; if not, write to the Free Software Foundation, Inc.,
  16 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17 */
  18
  19 #include "guiscalingfilter.h"
  20 #include "imagefilters.h"
  21 #include "settings.h"
  22 #include "util/numeric.h"
  23 #include <stdio.h>
  24
  25 /* Maintain a static cache to store the images that correspond to textures
  26  * in a format that's manipulable by code.  Some platforms exhibit issues
  27  * converting textures back into images repeatedly, and some don't even
  28  * allow it at all.
  29  */
  30 std::map<io::path, video::IImage *> g_imgCache;
  31
  32 /* Maintain a static cache of all pre-scaled textures.  These need to be
  33  * cleared as well when the cached images.
  34  */
  35 std::map<io::path, video::ITexture *> g_txrCache;
  36
  37 /* Manually insert an image into the cache, useful to avoid texture-to-image
  38  * conversion whenever we can intercept it.
  39  */
  40 void guiScalingCache(io::path key, video::IVideoDriver *driver, video::IImage *value)
  41 {
  42         if (!g_settings->getBool("gui_scaling_filter"))
  43                 return;
  44         video::IImage *copied = driver->createImage(value->getColorFormat(),
  45                         value->getDimension());
  46         value->copyTo(copied);
  47         g_imgCache[key] = copied;
  48 }
  49
  50 // Manually clear the cache, e.g. when switching to different worlds.
  51 void guiScalingCacheClear(video::IVideoDriver *driver)
  52 {
  53         for (std::map<io::path, video::IImage *>::iterator it = g_imgCache.begin();
  54                         it != g_imgCache.end(); ++it) {
  55                 if (it->second != NULL)
  56                         it->second->drop();
  57         }
  58         g_imgCache.clear();
  59         for (std::map<io::path, video::ITexture *>::iterator it = g_txrCache.begin();
  60                         it != g_txrCache.end(); ++it) {
  61                 if (it->second != NULL)
  62                         driver->removeTexture(it->second);
  63         }
  64         g_txrCache.clear();
  65 }
  66
  67 /* Get a cached, high-quality pre-scaled texture for display purposes.  If the
  68  * texture is not already cached, attempt to create it.  Returns a pre-scaled texture,
  69  * or the original texture if unable to pre-scale it.
  70  */
  71 video::ITexture *guiScalingResizeCached(video::IVideoDriver *driver,
  72                 video::ITexture *src, const core::rect<s32> &srcrect,
  73                 const core::rect<s32> &destrect)
  74 {
  75         if (src == NULL)
  76                 return src;
  77         if (!g_settings->getBool("gui_scaling_filter"))
  78                 return src;
  79
  80         // Calculate scaled texture name.
  81         char rectstr[200];
  82         snprintf(rectstr, sizeof(rectstr), "%d:%d:%d:%d:%d:%d",
  83                 srcrect.UpperLeftCorner.X,
  84                 srcrect.UpperLeftCorner.Y,
  85                 srcrect.getWidth(),
  86                 srcrect.getHeight(),
  87                 destrect.getWidth(),
  88                 destrect.getHeight());
  89         io::path origname = src->getName().getPath();
  90         io::path scalename = origname + "@guiScalingFilter:" + rectstr;
  91
  92         // Search for existing scaled texture.
  93         video::ITexture *scaled = g_txrCache[scalename];
  94         if (scaled)
  95                 return scaled;
  96
  97         // Try to find the texture converted to an image in the cache.
  98         // If the image was not found, try to extract it from the texture.
  99         video::IImage* srcimg = g_imgCache[origname];
 100         if (srcimg == NULL) {
 101                 if (!g_settings->getBool("gui_scaling_filter_txr2img"))
 102                         return src;
 103                 srcimg = driver->createImageFromData(src->getColorFormat(),
 104                         src->getSize(), src->lock(), false);
 105                 src->unlock();
 106                 g_imgCache[origname] = srcimg;
 107         }
 108
 109         // Create a new destination image and scale the source into it.
 110         imageCleanTransparent(srcimg, 0);
 111         video::IImage *destimg = driver->createImage(src->getColorFormat(),
 112                         core::dimension2d<u32>((u32)destrect.getWidth(),
 113                         (u32)destrect.getHeight()));
 114         imageScaleNNAA(srcimg, srcrect, destimg);
 115
 116 #ifdef __ANDROID__
 117         // Android is very picky about textures being powers of 2, so expand
 118         // the image dimensions to the next power of 2, if necessary, for
 119         // that platform.
 120         video::IImage *po2img = driver->createImage(src->getColorFormat(),
 121                         core::dimension2d<u32>(npot2((u32)destrect.getWidth()),
 122                         npot2((u32)destrect.getHeight())));
 123         po2img->fill(video::SColor(0, 0, 0, 0));
 124         destimg->copyTo(po2img);
 125         destimg->drop();
 126         destimg = po2img;
 127 #endif
 128
 129         // Convert the scaled image back into a texture.
 130         scaled = driver->addTexture(scalename, destimg, NULL);
 131         destimg->drop();
 132         g_txrCache[scalename] = scaled;
 133
 134         return scaled;
 135 }
 136
 137 /* Convenience wrapper for guiScalingResizeCached that accepts parameters that
 138  * are available at GUI imagebutton creation time.
 139  */
 140 video::ITexture *guiScalingImageButton(video::IVideoDriver *driver,
 141                 video::ITexture *src, s32 width, s32 height)
 142 {
 143         if (src == NULL)
 144                 return src;
 145         return guiScalingResizeCached(driver, src,
 146                 core::rect<s32>(0, 0, src->getSize().Width, src->getSize().Height),
 147                 core::rect<s32>(0, 0, width, height));
 148 }
 149
 150 /* Replacement for driver->draw2DImage() that uses the high-quality pre-scaled
 151  * texture, if configured.
 152  */
 153 void draw2DImageFilterScaled(video::IVideoDriver *driver, video::ITexture *txr,
 154                 const core::rect<s32> &destrect, const core::rect<s32> &srcrect,
 155                 const core::rect<s32> *cliprect, const video::SColor *const colors,
 156                 bool usealpha)
 157 {
 158         // Attempt to pre-scale image in software in high quality.
 159         video::ITexture *scaled = guiScalingResizeCached(driver, txr, srcrect, destrect);
 160         if (scaled == NULL)
 161                 return;
 162
 163         // Correct source rect based on scaled image.
 164         const core::rect<s32> mysrcrect = (scaled != txr)
 165                 ? core::rect<s32>(0, 0, destrect.getWidth(), destrect.getHeight())
 166                 : srcrect;
 167
 168         driver->draw2DImage(scaled, destrect, mysrcrect, cliprect, colors, usealpha);
 169 }