LCOV - code coverage report
Current view: top level - source/lib/tex - tex_tga.cpp (source / functions) Hit Total Coverage
Test: 0 A.D. test coverage report Lines: 32 53 60.4 %
Date: 2022-06-14 00:41:00 Functions: 4 6 66.7 %

          Line data    Source code
       1             : /* Copyright (C) 2017 Wildfire Games.
       2             :  *
       3             :  * Permission is hereby granted, free of charge, to any person obtaining
       4             :  * a copy of this software and associated documentation files (the
       5             :  * "Software"), to deal in the Software without restriction, including
       6             :  * without limitation the rights to use, copy, modify, merge, publish,
       7             :  * distribute, sublicense, and/or sell copies of the Software, and to
       8             :  * permit persons to whom the Software is furnished to do so, subject to
       9             :  * the following conditions:
      10             :  *
      11             :  * The above copyright notice and this permission notice shall be included
      12             :  * in all copies or substantial portions of the Software.
      13             :  *
      14             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
      15             :  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
      16             :  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
      17             :  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
      18             :  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
      19             :  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
      20             :  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
      21             :  */
      22             : 
      23             : /*
      24             :  * TGA codec.
      25             :  */
      26             : 
      27             : #include "precompiled.h"
      28             : 
      29             : #include "lib/byte_order.h"
      30             : #include "tex_codec.h"
      31             : #include "lib/bits.h"
      32             : 
      33             : #pragma pack(push, 1)
      34             : 
      35             : enum TgaImgType
      36             : {
      37             :     TGA_TRUE_COLOR = 2, // uncompressed 24 or 32 bit direct RGB
      38             :     TGA_GREY        = 3     // uncompressed 8 bit direct greyscale
      39             : };
      40             : 
      41             : enum TgaImgDesc
      42             : {
      43             :     TGA_RIGHT_TO_LEFT = BIT(4),
      44             :     TGA_TOP_DOWN      = BIT(5),
      45             : };
      46             : 
      47             : typedef struct
      48             : {
      49             :     u8 img_id_len;          // 0 - no image identifier present
      50             :     u8 color_map_type;      // 0 - no color map present
      51             :     u8 img_type;            // see TgaImgType
      52             :     u8 color_map[5];        // unused
      53             : 
      54             :     u16 x_origin;           // unused
      55             :     u16 y_origin;           // unused
      56             : 
      57             :     u16 w;
      58             :     u16 h;
      59             :     u8 bpp;                 // bits per pixel
      60             : 
      61             :     u8 img_desc;
      62             : }
      63             : TgaHeader;
      64             : 
      65             : // TGA file: header [img id] [color map] image data
      66             : 
      67             : #pragma pack(pop)
      68             : 
      69             : 
      70          13 : Status TexCodecTga::transform(Tex* UNUSED(t), size_t UNUSED(transforms)) const
      71             : {
      72          13 :     return INFO::TEX_CODEC_CANNOT_HANDLE;
      73             : }
      74             : 
      75             : 
      76           1 : bool TexCodecTga::is_hdr(const u8* file) const
      77             : {
      78           1 :     TgaHeader* hdr = (TgaHeader*)file;
      79             : 
      80             :     // the first TGA header doesn't have a magic field;
      81             :     // we can only check if the first 4 bytes are valid
      82             :     // .. not direct color
      83           1 :     if(hdr->color_map_type != 0)
      84             :         return false;
      85             :     // .. wrong color type (not uncompressed greyscale or RGB)
      86           1 :     if(hdr->img_type != TGA_TRUE_COLOR && hdr->img_type != TGA_GREY)
      87           0 :         return false;
      88             : 
      89             :     // note: we can't check img_id_len or color_map[0] - they are
      90             :     // undefined and may assume any value.
      91             : 
      92             :     return true;
      93             : }
      94             : 
      95             : 
      96           0 : bool TexCodecTga::is_ext(const OsPath& extension) const
      97             : {
      98           0 :     return extension == L".tga";
      99             : }
     100             : 
     101             : 
     102           2 : size_t TexCodecTga::hdr_size(const u8* file) const
     103             : {
     104           2 :     size_t hdr_size = sizeof(TgaHeader);
     105           2 :     if(file)
     106             :     {
     107           1 :         TgaHeader* hdr = (TgaHeader*)file;
     108           1 :         hdr_size += hdr->img_id_len;
     109             :     }
     110           2 :     return hdr_size;
     111             : }
     112             : 
     113             : 
     114             : // requirements: uncompressed, direct color, bottom up
     115           1 : Status TexCodecTga::decode(u8* RESTRICT data, size_t UNUSED(size), Tex* RESTRICT t) const
     116             : {
     117           1 :     const TgaHeader* hdr = (const TgaHeader*)data;
     118           1 :     const u8 type  = hdr->img_type;
     119           1 :     const size_t w   = read_le16(&hdr->w);
     120           1 :     const size_t h   = read_le16(&hdr->h);
     121           1 :     const size_t bpp = hdr->bpp;
     122           1 :     const u8 desc  = hdr->img_desc;
     123             : 
     124           1 :     size_t flags = 0;
     125           1 :     flags |= (desc & TGA_TOP_DOWN)? TEX_TOP_DOWN : TEX_BOTTOM_UP;
     126           1 :     if(desc & 0x0F) // alpha bits
     127           1 :         flags |= TEX_ALPHA;
     128           1 :     if(bpp == 8)
     129           0 :         flags |= TEX_GREY;
     130           1 :     if(type == TGA_TRUE_COLOR)
     131           1 :         flags |= TEX_BGR;
     132             : 
     133             :     // sanity checks
     134             :     // .. storing right-to-left is just stupid;
     135             :     //    we're not going to bother converting it.
     136           1 :     if(desc & TGA_RIGHT_TO_LEFT)
     137           0 :         WARN_RETURN(ERR::TEX_INVALID_LAYOUT);
     138             : 
     139           1 :     t->m_Width  = w;
     140           1 :     t->m_Height = h;
     141           1 :     t->m_Bpp    = bpp;
     142           1 :     t->m_Flags  = flags;
     143           1 :     return INFO::OK;
     144             : }
     145             : 
     146             : 
     147           0 : Status TexCodecTga::encode(Tex* RESTRICT t, DynArray* RESTRICT da) const
     148             : {
     149           0 :     u8 img_desc = 0;
     150           0 :     if(t->m_Flags & TEX_TOP_DOWN)
     151           0 :         img_desc |= TGA_TOP_DOWN;
     152           0 :     if(t->m_Bpp == 32)
     153           0 :         img_desc |= 8;  // size of alpha channel
     154           0 :     TgaImgType img_type = (t->m_Flags & TEX_GREY)? TGA_GREY : TGA_TRUE_COLOR;
     155             : 
     156           0 :     size_t transforms = t->m_Flags;
     157           0 :     transforms &= ~TEX_ORIENTATION; // no flip needed - we can set top-down bit.
     158           0 :     transforms ^= TEX_BGR;          // TGA is native BGR.
     159             : 
     160           0 :     const TgaHeader hdr =
     161             :     {
     162             :         0,              // no image identifier present
     163             :         0,              // no color map present
     164             :         (u8)img_type,
     165             :         {0,0,0,0,0},    // unused (color map)
     166             :         0, 0,           // unused (origin)
     167           0 :         (u16)t->m_Width,
     168           0 :         (u16)t->m_Height,
     169             :         (u8)t->m_Bpp,
     170             :         img_desc
     171           0 :     };
     172           0 :     const size_t hdr_size = sizeof(hdr);
     173           0 :     return tex_codec_write(t, transforms, &hdr, hdr_size, da);
     174             : }
     175             : 

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