Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  GDAL WEBP Driver
       4             :  * Purpose:  Implement GDAL WEBP Support based on libwebp
       5             :  * Author:   Even Rouault, <even dot rouault at spatialys.com>
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2011-2013, Even Rouault <even dot rouault at spatialys.com>
       9             :  *
      10             :  * SPDX-License-Identifier: MIT
      11             :  ****************************************************************************/
      12             : 
      13             : #include "webp_headers.h"
      14             : #include "webpdrivercore.h"
      15             : 
      16             : /************************************************************************/
      17             : /*                     WEBPDriverIdentify()                             */
      18             : /************************************************************************/
      19             : 
      20       51040 : int WEBPDriverIdentify(GDALOpenInfo *poOpenInfo)
      21             : 
      22             : {
      23       51040 :     const int nHeaderBytes = poOpenInfo->nHeaderBytes;
      24       51040 :     const GByte *pabyHeader = poOpenInfo->pabyHeader;
      25             : 
      26       51040 :     if (nHeaderBytes < 20)
      27       47782 :         return FALSE;
      28             : 
      29        3933 :     return memcmp(pabyHeader, "RIFF", 4) == 0 &&
      30        3933 :            memcmp(pabyHeader + 8, "WEBP", 4) == 0 &&
      31         675 :            (memcmp(pabyHeader + 12, "VP8 ", 4) == 0 ||
      32         562 :             memcmp(pabyHeader + 12, "VP8L", 4) == 0 ||
      33        3781 :             memcmp(pabyHeader + 12, "VP8X", 4) == 0);
      34             : }
      35             : 
      36             : /************************************************************************/
      37             : /*                      WEBPDriverSetCommonMetadata()                   */
      38             : /************************************************************************/
      39             : 
      40        1304 : void WEBPDriverSetCommonMetadata(GDALDriver *poDriver)
      41             : {
      42        1304 :     poDriver->SetDescription(DRIVER_NAME);
      43        1304 :     poDriver->SetMetadataItem(GDAL_DCAP_RASTER, "YES");
      44        1304 :     poDriver->SetMetadataItem(GDAL_DMD_LONGNAME, "WEBP");
      45        1304 :     poDriver->SetMetadataItem(GDAL_DMD_HELPTOPIC, "drivers/raster/webp.html");
      46        1304 :     poDriver->SetMetadataItem(GDAL_DMD_EXTENSION, "webp");
      47        1304 :     poDriver->SetMetadataItem(GDAL_DMD_MIMETYPE, "image/webp");
      48        1304 :     poDriver->SetMetadataItem(GDAL_DMD_CREATIONDATATYPES, "Byte");
      49             : 
      50        1304 :     poDriver->SetMetadataItem(
      51             :         GDAL_DMD_CREATIONOPTIONLIST,
      52             :         "<CreationOptionList>\n"
      53             :         "   <Option name='QUALITY' type='float' description='good=100, bad=0' "
      54             :         "default='75'/>\n"
      55             : #if WEBP_ENCODER_ABI_VERSION >= 0x0100
      56             :         "   <Option name='LOSSLESS' type='boolean' description='Whether "
      57             :         "lossless compression should be used' default='FALSE'/>\n"
      58             : #endif
      59             :         "   <Option name='LOSSLESS_COPY' type='string-select' "
      60             :         "description='Whether conversion should be lossless' default='AUTO'>"
      61             :         "     <Value>AUTO</Value>"
      62             :         "     <Value>YES</Value>"
      63             :         "     <Value>NO</Value>"
      64             :         "   </Option>"
      65             :         "   <Option name='PRESET' type='string-select' description='kind of "
      66             :         "image' default='DEFAULT'>\n"
      67             :         "       <Value>DEFAULT</Value>\n"
      68             :         "       <Value>PICTURE</Value>\n"
      69             :         "       <Value>PHOTO</Value>\n"
      70             :         "       <Value>DRAWING</Value>\n"
      71             :         "       <Value>ICON</Value>\n"
      72             :         "       <Value>TEXT</Value>\n"
      73             :         "   </Option>\n"
      74             :         "   <Option name='TARGETSIZE' type='int' description='if non-zero, "
      75             :         "desired target size in bytes. Has precedence over QUALITY'/>\n"
      76             :         "   <Option name='PSNR' type='float' description='if non-zero, minimal "
      77             :         "distortion to to achieve. Has precedence over TARGETSIZE'/>\n"
      78             :         "   <Option name='METHOD' type='int' description='quality/speed "
      79             :         "trade-off. fast=0, slower-better=6' default='4'/>\n"
      80             :         "   <Option name='SEGMENTS' type='int' description='maximum number of "
      81             :         "segments [1-4]' default='4'/>\n"
      82             :         "   <Option name='SNS_STRENGTH' type='int' description='Spatial Noise "
      83             :         "Shaping. off=0, maximum=100' default='50'/>\n"
      84             :         "   <Option name='FILTER_STRENGTH' type='int' description='Filter "
      85             :         "strength. off=0, strongest=100' default='20'/>\n"
      86             :         "   <Option name='FILTER_SHARPNESS' type='int' description='Filter "
      87             :         "sharpness. off=0, least sharp=7' default='0'/>\n"
      88             :         "   <Option name='FILTER_TYPE' type='int' description='Filtering type. "
      89             :         "simple=0, strong=1' default='0'/>\n"
      90             :         "   <Option name='AUTOFILTER' type='int' description=\"Auto adjust "
      91             :         "filter's strength. off=0, on=1\" default='0'/>\n"
      92             :         "   <Option name='PASS' type='int' description='Number of entropy "
      93             :         "analysis passes [1-10]' default='1'/>\n"
      94             :         "   <Option name='PREPROCESSING' type='int' description='Preprocessing "
      95             :         "filter. none=0, segment-smooth=1' default='0'/>\n"
      96             :         "   <Option name='PARTITIONS' type='int' description='log2(number of "
      97             :         "token partitions) in [0..3]' default='0'/>\n"
      98             : #if WEBP_ENCODER_ABI_VERSION >= 0x0002
      99             :         "   <Option name='PARTITION_LIMIT' type='int' description='quality "
     100             :         "degradation allowed to fit the 512k limit on prediction modes coding "
     101             :         "(0=no degradation, 100=full)' default='0'/>\n"
     102             : #endif
     103             : #if WEBP_ENCODER_ABI_VERSION >= 0x0209
     104             :         "   <Option name='EXACT' type='int' description='preserve the exact "
     105             :         "RGB values under transparent area. off=0, on=1' default='0'/>\n"
     106             : #endif
     107        1304 :         "</CreationOptionList>\n");
     108             : 
     109        1304 :     poDriver->SetMetadataItem(GDAL_DCAP_VIRTUALIO, "YES");
     110             : 
     111        1304 :     poDriver->pfnIdentify = WEBPDriverIdentify;
     112             : 
     113        1304 :     poDriver->SetMetadataItem(GDAL_DCAP_OPEN, "YES");
     114        1304 :     poDriver->SetMetadataItem(GDAL_DCAP_CREATECOPY, "YES");
     115        1304 : }
     116             : 
     117             : /************************************************************************/
     118             : /*                     DeclareDeferredWEBPPlugin()                      */
     119             : /************************************************************************/
     120             : 
     121             : #ifdef PLUGIN_FILENAME
     122        1595 : void DeclareDeferredWEBPPlugin()
     123             : {
     124        1595 :     if (GDALGetDriverByName(DRIVER_NAME) != nullptr)
     125             :     {
     126         302 :         return;
     127             :     }
     128        1293 :     auto poDriver = new GDALPluginDriverProxy(PLUGIN_FILENAME);
     129             : #ifdef PLUGIN_INSTALLATION_MESSAGE
     130             :     poDriver->SetMetadataItem(GDAL_DMD_PLUGIN_INSTALLATION_MESSAGE,
     131             :                               PLUGIN_INSTALLATION_MESSAGE);
     132             : #endif
     133        1293 :     WEBPDriverSetCommonMetadata(poDriver);
     134        1293 :     GetGDALDriverManager()->DeclareDeferredPluginDriver(poDriver);
     135             : }
     136             : #endif