forked from 0ad/0ad
historic_bruno
b1c4e29ac8
NOTE: requires update-workspaces and may require correction of some modded actors/scenarios This was SVN commit r16438.
176 lines
4.4 KiB
C++
176 lines
4.4 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* TGA codec.
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*/
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#include "precompiled.h"
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#include "lib/byte_order.h"
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#include "tex_codec.h"
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#include "lib/bits.h"
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#pragma pack(push, 1)
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enum TgaImgType
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{
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TGA_TRUE_COLOR = 2, // uncompressed 24 or 32 bit direct RGB
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TGA_GREY = 3 // uncompressed 8 bit direct greyscale
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};
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enum TgaImgDesc
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{
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TGA_RIGHT_TO_LEFT = BIT(4),
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TGA_TOP_DOWN = BIT(5),
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};
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typedef struct
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{
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u8 img_id_len; // 0 - no image identifier present
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u8 color_map_type; // 0 - no color map present
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u8 img_type; // see TgaImgType
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u8 color_map[5]; // unused
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u16 x_origin; // unused
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u16 y_origin; // unused
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u16 w;
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u16 h;
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u8 bpp; // bits per pixel
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u8 img_desc;
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}
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TgaHeader;
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// TGA file: header [img id] [color map] image data
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#pragma pack(pop)
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Status TexCodecTga::transform(Tex* UNUSED(t), size_t UNUSED(transforms)) const
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{
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return INFO::TEX_CODEC_CANNOT_HANDLE;
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}
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bool TexCodecTga::is_hdr(const u8* file) const
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{
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TgaHeader* hdr = (TgaHeader*)file;
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// the first TGA header doesn't have a magic field;
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// we can only check if the first 4 bytes are valid
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// .. not direct color
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if(hdr->color_map_type != 0)
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return false;
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// .. wrong color type (not uncompressed greyscale or RGB)
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if(hdr->img_type != TGA_TRUE_COLOR && hdr->img_type != TGA_GREY)
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return false;
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// note: we can't check img_id_len or color_map[0] - they are
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// undefined and may assume any value.
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return true;
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}
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bool TexCodecTga::is_ext(const OsPath& extension) const
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{
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return extension == L".tga";
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}
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size_t TexCodecTga::hdr_size(const u8* file) const
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{
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size_t hdr_size = sizeof(TgaHeader);
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if(file)
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{
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TgaHeader* hdr = (TgaHeader*)file;
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hdr_size += hdr->img_id_len;
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}
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return hdr_size;
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}
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// requirements: uncompressed, direct color, bottom up
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Status TexCodecTga::decode(rpU8 data, size_t UNUSED(size), Tex* RESTRICT t) const
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{
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const TgaHeader* hdr = (const TgaHeader*)data;
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const u8 type = hdr->img_type;
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const size_t w = read_le16(&hdr->w);
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const size_t h = read_le16(&hdr->h);
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const size_t bpp = hdr->bpp;
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const u8 desc = hdr->img_desc;
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size_t flags = 0;
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flags |= (desc & TGA_TOP_DOWN)? TEX_TOP_DOWN : TEX_BOTTOM_UP;
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if(desc & 0x0F) // alpha bits
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flags |= TEX_ALPHA;
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if(bpp == 8)
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flags |= TEX_GREY;
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if(type == TGA_TRUE_COLOR)
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flags |= TEX_BGR;
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// sanity checks
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// .. storing right-to-left is just stupid;
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// we're not going to bother converting it.
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if(desc & TGA_RIGHT_TO_LEFT)
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WARN_RETURN(ERR::TEX_INVALID_LAYOUT);
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t->m_Width = w;
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t->m_Height = h;
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t->m_Bpp = bpp;
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t->m_Flags = flags;
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return INFO::OK;
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}
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Status TexCodecTga::encode(Tex* RESTRICT t, DynArray* RESTRICT da) const
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{
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u8 img_desc = 0;
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if(t->m_Flags & TEX_TOP_DOWN)
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img_desc |= TGA_TOP_DOWN;
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if(t->m_Bpp == 32)
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img_desc |= 8; // size of alpha channel
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TgaImgType img_type = (t->m_Flags & TEX_GREY)? TGA_GREY : TGA_TRUE_COLOR;
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size_t transforms = t->m_Flags;
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transforms &= ~TEX_ORIENTATION; // no flip needed - we can set top-down bit.
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transforms ^= TEX_BGR; // TGA is native BGR.
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const TgaHeader hdr =
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{
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0, // no image identifier present
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0, // no color map present
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(u8)img_type,
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{0,0,0,0,0}, // unused (color map)
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0, 0, // unused (origin)
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(u16)t->m_Width,
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(u16)t->m_Height,
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(u8)t->m_Bpp,
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img_desc
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};
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const size_t hdr_size = sizeof(hdr);
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return tex_codec_write(t, transforms, &hdr, hdr_size, da);
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}
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