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/* Copyright (C) 2017 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* support routines for 2d texture access/writing.
*/
#include "precompiled.h"
#include "tex.h"
#include <math.h>
#include <stdlib.h>
#include <algorithm>
#include "lib/timer.h"
#include "lib/bits.h"
#include "lib/allocators/shared_ptr.h"
#include "lib/sysdep/cpu.h"
#include "tex_codec.h"
static const StatusDefinition texStatusDefinitions[] = {
{ ERR::TEX_FMT_INVALID, L"Invalid/unsupported texture format" },
{ ERR::TEX_INVALID_COLOR_TYPE, L"Invalid color type" },
{ ERR::TEX_NOT_8BIT_PRECISION, L"Not 8-bit channel precision" },
{ ERR::TEX_INVALID_LAYOUT, L"Unsupported texel layout, e.g. right-to-left" },
{ ERR::TEX_COMPRESSED, L"Unsupported texture compression" },
{ WARN::TEX_INVALID_DATA, L"Warning: invalid texel data encountered" },
{ ERR::TEX_INVALID_SIZE, L"Texture size is incorrect" },
{ INFO::TEX_CODEC_CANNOT_HANDLE, L"Texture codec cannot handle the given format" }
};
STATUS_ADD_DEFINITIONS(texStatusDefinitions);
//-----------------------------------------------------------------------------
// validation
//-----------------------------------------------------------------------------
// be careful not to use other tex_* APIs here because they call us.
Status Tex::validate() const
{
if(m_Flags & TEX_UNDEFINED_FLAGS)
WARN_RETURN(ERR::_1);
// pixel data (only check validity if the image is still in memory;
// ogl_tex frees the data after uploading to GL)
if(m_Data)
{
// file size smaller than header+pixels.
// possible causes: texture file header is invalid,
// or file wasn't loaded completely.
if(m_DataSize < m_Ofs + m_Width*m_Height*m_Bpp/8)
WARN_RETURN(ERR::_2);
}
// bits per pixel
// (we don't bother checking all values; a sanity check is enough)
if(m_Bpp % 4 || m_Bpp > 32)
WARN_RETURN(ERR::_3);
// flags
// .. DXT value
const size_t dxt = m_Flags & TEX_DXT;
if(dxt != 0 && dxt != 1 && dxt != DXT1A && dxt != 3 && dxt != 5)
WARN_RETURN(ERR::_4);
// .. orientation
const size_t orientation = m_Flags & TEX_ORIENTATION;
if(orientation == (TEX_BOTTOM_UP|TEX_TOP_DOWN))
WARN_RETURN(ERR::_5);
return INFO::OK;
}
#define CHECK_TEX(t) RETURN_STATUS_IF_ERR((t->validate()))
// check if the given texture format is acceptable: 8bpp grey,
// 24bpp color or 32bpp color+alpha (BGR / upside down are permitted).
// basically, this is the "plain" format understood by all codecs and
// tex_codec_plain_transform.
Status tex_validate_plain_format(size_t bpp, size_t flags)
{
const bool alpha = (flags & TEX_ALPHA ) != 0;
const bool grey = (flags & TEX_GREY ) != 0;
const bool dxt = (flags & TEX_DXT ) != 0;
const bool mipmaps = (flags & TEX_MIPMAPS) != 0;
if(dxt || mipmaps)
WARN_RETURN(ERR::TEX_FMT_INVALID);
// grey must be 8bpp without alpha, or it's invalid.
if(grey)
{
if(bpp == 8 && !alpha)
return INFO::OK;
WARN_RETURN(ERR::TEX_FMT_INVALID);
}
if(bpp == 24 && !alpha)
return INFO::OK;
if(bpp == 32 && alpha)
return INFO::OK;
WARN_RETURN(ERR::TEX_FMT_INVALID);
}
//-----------------------------------------------------------------------------
// mipmaps
//-----------------------------------------------------------------------------
void tex_util_foreach_mipmap(size_t w, size_t h, size_t bpp, const u8* pixels, int levels_to_skip, size_t data_padding, MipmapCB cb, void* RESTRICT cbData)
{
ENSURE(levels_to_skip >= 0 || levels_to_skip == TEX_BASE_LEVEL_ONLY);
size_t level_w = w, level_h = h;
const u8* level_data = pixels;
// we iterate through the loop (necessary to skip over image data),
// but do not actually call back until the requisite number of
// levels have been skipped (i.e. level == 0).
int level = (levels_to_skip == TEX_BASE_LEVEL_ONLY)? 0 : -levels_to_skip;
// until at level 1x1:
for(;;)
{
// used to skip past this mip level in <data>
const size_t level_dataSize = (size_t)(round_up(level_w, data_padding) * round_up(level_h, data_padding) * bpp/8);
if(level >= 0)
cb((size_t)level, level_w, level_h, level_data, level_dataSize, cbData);
level_data += level_dataSize;
// 1x1 reached - done
if(level_w == 1 && level_h == 1)
break;
level_w /= 2;
level_h /= 2;
// if the texture is non-square, one of the dimensions will become
// 0 before the other. to satisfy OpenGL's expectations, change it
// back to 1.
if(level_w == 0) level_w = 1;
if(level_h == 0) level_h = 1;
level++;
// special case: no mipmaps, we were only supposed to call for
// the base level
if(levels_to_skip == TEX_BASE_LEVEL_ONLY)
break;
}
}
struct CreateLevelData
{
size_t num_components;
size_t prev_level_w;
size_t prev_level_h;
const u8* prev_level_data;
size_t prev_level_dataSize;
};
// uses 2x2 box filter
static void create_level(size_t level, size_t level_w, size_t level_h, const u8* RESTRICT level_data, size_t level_dataSize, void* RESTRICT cbData)
{
CreateLevelData* cld = (CreateLevelData*)cbData;
const size_t src_w = cld->prev_level_w;
const size_t src_h = cld->prev_level_h;
const u8* src = cld->prev_level_data;
u8* dst = (u8*)level_data;
// base level - must be copied over from source buffer
if(level == 0)
{
ENSURE(level_dataSize == cld->prev_level_dataSize);
memcpy(dst, src, level_dataSize);
}
else
{
const size_t num_components = cld->num_components;
const size_t dx = num_components, dy = dx*src_w;
// special case: image is too small for 2x2 filter
if(cld->prev_level_w == 1 || cld->prev_level_h == 1)
{
// image is either a horizontal or vertical line.
// their memory layout is the same (packed pixels), so no special
// handling is needed; just pick max dimension.
for(size_t y = 0; y < std::max(src_w, src_h); y += 2)
{
for(size_t i = 0; i < num_components; i++)
{
*dst++ = (src[0]+src[dx]+1)/2;
src += 1;
}
src += dx; // skip to next pixel (since box is 2x2)
}
}
// normal
else
{
for(size_t y = 0; y < src_h; y += 2)
{
for(size_t x = 0; x < src_w; x += 2)
{
for(size_t i = 0; i < num_components; i++)
{
*dst++ = (src[0]+src[dx]+src[dy]+src[dx+dy]+2)/4;
src += 1;
}
src += dx; // skip to next pixel (since box is 2x2)
}
src += dy; // skip to next row (since box is 2x2)
}
}
ENSURE(dst == level_data + level_dataSize);
ENSURE(src == cld->prev_level_data + cld->prev_level_dataSize);
}
cld->prev_level_data = level_data;
cld->prev_level_dataSize = level_dataSize;
cld->prev_level_w = level_w;
cld->prev_level_h = level_h;
}
static Status add_mipmaps(Tex* t, size_t w, size_t h, size_t bpp, void* newData, size_t dataSize)
{
// this code assumes the image is of POT dimension; we don't
// go to the trouble of implementing image scaling because
// the only place this is used (ogl_tex_upload) requires POT anyway.
if(!is_pow2(w) || !is_pow2(h))
WARN_RETURN(ERR::TEX_INVALID_SIZE);
t->m_Flags |= TEX_MIPMAPS; // must come before tex_img_size!
const size_t mipmap_size = t->img_size();
shared_ptr<u8> mipmapData;
AllocateAligned(mipmapData, mipmap_size);
CreateLevelData cld = { bpp/8, w, h, (const u8*)newData, dataSize };
tex_util_foreach_mipmap(w, h, bpp, mipmapData.get(), 0, 1, create_level, &cld);
t->m_Data = mipmapData;
t->m_DataSize = mipmap_size;
t->m_Ofs = 0;
return INFO::OK;
}
//-----------------------------------------------------------------------------
// pixel format conversion (transformation)
//-----------------------------------------------------------------------------
TIMER_ADD_CLIENT(tc_plain_transform);
// handles BGR and row flipping in "plain" format (see below).
//
// called by codecs after they get their format-specific transforms out of
// the way. note that this approach requires several passes over the image,
// but is much easier to maintain than providing all<->all conversion paths.
//
// somewhat optimized (loops are hoisted, cache associativity accounted for)
static Status plain_transform(Tex* t, size_t transforms)
{
TIMER_ACCRUE(tc_plain_transform);
// (this is also called directly instead of through ogl_tex, so
// we need to validate)
CHECK_TEX(t);
// extract texture info
const size_t w = t->m_Width, h = t->m_Height, bpp = t->m_Bpp;
const size_t flags = t->m_Flags;
u8* const srcStorage = t->get_data();
// sanity checks (not errors, we just can't handle these cases)
// .. unknown transform
if(transforms & ~(TEX_BGR|TEX_ORIENTATION|TEX_MIPMAPS|TEX_ALPHA))
return INFO::TEX_CODEC_CANNOT_HANDLE;
// .. data is not in "plain" format
RETURN_STATUS_IF_ERR(tex_validate_plain_format(bpp, flags));
// .. nothing to do
if(!transforms)
return INFO::OK;
const size_t srcSize = t->img_size();
size_t dstSize = srcSize;
if(transforms & TEX_ALPHA)
{
// add alpha channel
if(bpp == 24)
{
dstSize = (srcSize / 3) * 4;
t->m_Bpp = 32;
}
// remove alpha channel
else if(bpp == 32)
{
return INFO::TEX_CODEC_CANNOT_HANDLE;
}
// can't have alpha with grayscale
else
{
return INFO::TEX_CODEC_CANNOT_HANDLE;
}
}
// allocate copy of the image data.
// rationale: L1 cache is typically A2 => swapping in-place with a
// line buffer leads to thrashing. we'll assume the whole texture*2
// fits in cache, allocate a copy, and transfer directly from there.
//
// this is necessary even when not flipping because the initial data
// is read-only.
shared_ptr<u8> dstStorage;
AllocateAligned(dstStorage, dstSize);
// setup row source/destination pointers (simplifies outer loop)
u8* dst = (u8*)dstStorage.get();
const u8* src;
const size_t pitch = w * bpp/8; // source bpp (not necessarily dest bpp)
// .. avoid y*pitch multiply in row loop; instead, add row_ofs.
ssize_t row_ofs = (ssize_t)pitch;
// flipping rows (0,1,2 -> 2,1,0)
if(transforms & TEX_ORIENTATION)
{
src = (const u8*)srcStorage+srcSize-pitch; // last row
row_ofs = -(ssize_t)pitch;
}
// adding/removing alpha channel (can't convert in-place)
else if(transforms & TEX_ALPHA)
{
src = (const u8*)srcStorage;
}
// do other transforms in-place
else
{
src = (const u8*)dstStorage.get();
memcpy(dstStorage.get(), srcStorage, srcSize);
}
// no conversion necessary
if(!(transforms & (TEX_BGR | TEX_ALPHA)))
{
if(src != dst) // avoid overlapping memcpy if not flipping rows
{
for(size_t y = 0; y < h; y++)
{
memcpy(dst, src, pitch);
dst += pitch;
src += row_ofs;
}
}
}
// RGB -> BGRA, BGR -> RGBA
else if(bpp == 24 && (transforms & TEX_ALPHA) && (transforms & TEX_BGR))
{
for(size_t y = 0; y < h; y++)
{
for(size_t x = 0; x < w; x++)
{
// need temporaries in case src == dst (i.e. not flipping)
const u8 b = src[0], g = src[1], r = src[2];
dst[0] = r; dst[1] = g; dst[2] = b; dst[3] = 0xFF;
dst += 4;
src += 3;
}
src += row_ofs - pitch; // flip? previous row : stay
}
}
// RGB -> RGBA, BGR -> BGRA
else if(bpp == 24 && (transforms & TEX_ALPHA) && !(transforms & TEX_BGR))
{
for(size_t y = 0; y < h; y++)
{
for(size_t x = 0; x < w; x++)
{
// need temporaries in case src == dst (i.e. not flipping)
const u8 r = src[0], g = src[1], b = src[2];
dst[0] = r; dst[1] = g; dst[2] = b; dst[3] = 0xFF;
dst += 4;
src += 3;
}
src += row_ofs - pitch; // flip? previous row : stay
}
}
// RGB <-> BGR
else if(bpp == 24 && !(transforms & TEX_ALPHA))
{
for(size_t y = 0; y < h; y++)
{
for(size_t x = 0; x < w; x++)
{
// need temporaries in case src == dst (i.e. not flipping)
const u8 b = src[0], g = src[1], r = src[2];
dst[0] = r; dst[1] = g; dst[2] = b;
dst += 3;
src += 3;
}
src += row_ofs - pitch; // flip? previous row : stay
}
}
// RGBA <-> BGRA
else if(bpp == 32 && !(transforms & TEX_ALPHA))
{
for(size_t y = 0; y < h; y++)
{
for(size_t x = 0; x < w; x++)
{
// need temporaries in case src == dst (i.e. not flipping)
const u8 b = src[0], g = src[1], r = src[2], a = src[3];
dst[0] = r; dst[1] = g; dst[2] = b; dst[3] = a;
dst += 4;
src += 4;
}
src += row_ofs - pitch; // flip? previous row : stay
}
}
else
{
debug_warn(L"unsupported transform");
return INFO::TEX_CODEC_CANNOT_HANDLE;
}
t->m_Data = dstStorage;
t->m_DataSize = dstSize;
t->m_Ofs = 0;
if(!(t->m_Flags & TEX_MIPMAPS) && transforms & TEX_MIPMAPS)
RETURN_STATUS_IF_ERR(add_mipmaps(t, w, h, bpp, dstStorage.get(), dstSize));
CHECK_TEX(t);
return INFO::OK;
}
TIMER_ADD_CLIENT(tc_transform);
// change the pixel format by flipping the state of all TEX_* flags
// that are set in transforms.
Status Tex::transform(size_t transforms)
{
TIMER_ACCRUE(tc_transform);
CHECK_TEX(this);
const size_t target_flags = m_Flags ^ transforms;
size_t remaining_transforms;
for(;;)
{
remaining_transforms = target_flags ^ m_Flags;
// we're finished (all required transforms have been done)
if(remaining_transforms == 0)
return INFO::OK;
Status ret = tex_codec_transform(this, remaining_transforms);
if(ret != INFO::OK)
break;
}
// last chance
RETURN_STATUS_IF_ERR(plain_transform(this, remaining_transforms));
return INFO::OK;
}
// change the pixel format to the new format specified by <new_flags>.
// (note: this is equivalent to transform(t, t->flags^new_flags).
Status Tex::transform_to(size_t new_flags)
{
// transform takes care of validating
const size_t transforms = m_Flags ^ new_flags;
return transform(transforms);
}
//-----------------------------------------------------------------------------
// image orientation
//-----------------------------------------------------------------------------
// see "Default Orientation" in docs.
static int global_orientation = TEX_TOP_DOWN;
// set the orientation (either TEX_BOTTOM_UP or TEX_TOP_DOWN) to which
// all loaded images will automatically be converted
// (excepting file formats that don't specify their orientation, i.e. DDS).
void tex_set_global_orientation(int o)
{
ENSURE(o == TEX_TOP_DOWN || o == TEX_BOTTOM_UP);
global_orientation = o;
}
static void flip_to_global_orientation(Tex* t)
{
// (can't use normal CHECK_TEX due to void return)
WARN_IF_ERR(t->validate());
size_t orientation = t->m_Flags & TEX_ORIENTATION;
// if codec knows which way around the image is (i.e. not DDS):
if(orientation)
{
// flip image if necessary
size_t transforms = orientation ^ global_orientation;
WARN_IF_ERR(plain_transform(t, transforms));
}
// indicate image is at global orientation. this is still done even
// if the codec doesn't know: the default orientation should be chosen
// to make that work correctly (see "Default Orientation" in docs).
t->m_Flags = (t->m_Flags & ~TEX_ORIENTATION) | global_orientation;
// (can't use normal CHECK_TEX due to void return)
WARN_IF_ERR(t->validate());
}
// indicate if the orientation specified by <src_flags> matches
// dst_orientation (if the latter is 0, then the global_orientation).
// (we ask for src_flags instead of src_orientation so callers don't
// have to mask off TEX_ORIENTATION)
bool tex_orientations_match(size_t src_flags, size_t dst_orientation)
{
const size_t src_orientation = src_flags & TEX_ORIENTATION;
if(dst_orientation == 0)
dst_orientation = global_orientation;
return (src_orientation == dst_orientation);
}
//-----------------------------------------------------------------------------
// misc. API
//-----------------------------------------------------------------------------
// indicate if <filename>'s extension is that of a texture format
// supported by Tex::load. case-insensitive.
//
// rationale: Tex::load complains if the given file is of an
// unsupported type. this API allows users to preempt that warning
// (by checking the filename themselves), and also provides for e.g.
// enumerating only images in a file picker.
// an alternative might be a flag to suppress warning about invalid files,
// but this is open to misuse.
bool tex_is_known_extension(const VfsPath& pathname)
{
const ITexCodec* dummy;
// found codec for it => known extension
const OsPath extension = pathname.Extension();
if(tex_codec_for_filename(extension, &dummy) == INFO::OK)
return true;
return false;
}
// store the given image data into a Tex object; this will be as if
// it had been loaded via Tex::load.
//
// rationale: support for in-memory images is necessary for
// emulation of glCompressedTexImage2D and useful overall.
// however, we don't want to provide an alternate interface for each API;
// these would have to be changed whenever fields are added to Tex.
// instead, provide one entry point for specifying images.
//
// we need only add bookkeeping information and "wrap" it in
// our Tex struct, hence the name.
Status Tex::wrap(size_t w, size_t h, size_t bpp, size_t flags, const shared_ptr<u8>& data, size_t ofs)
{
m_Width = w;
m_Height = h;
m_Bpp = bpp;
m_Flags = flags;
m_Data = data;
m_DataSize = ofs + w*h*bpp/8;
m_Ofs = ofs;
CHECK_TEX(this);
return INFO::OK;
}
// free all resources associated with the image and make further
// use of it impossible.
void Tex::free()
{
// do not validate - this is called from Tex::load if loading
// failed, so not all fields may be valid.
m_Data.reset();
// do not zero out the fields! that could lead to trouble since
// ogl_tex_upload followed by ogl_tex_free is legit, but would
// cause OglTex_validate to fail (since its Tex.w is == 0).
}
//-----------------------------------------------------------------------------
// getters
//-----------------------------------------------------------------------------
// returns a pointer to the image data (pixels), taking into account any
// header(s) that may come before it.
u8* Tex::get_data()
{
// (can't use normal CHECK_TEX due to u8* return value)
WARN_IF_ERR(validate());
u8* p = m_Data.get();
if(!p)
return 0;
return p + m_Ofs;
}
// returns color of 1x1 mipmap level
u32 Tex::get_average_color() const
{
// require mipmaps
if(!(m_Flags & TEX_MIPMAPS))
return 0;
// find the total size of image data
size_t size = img_size();
// compute the size of the last (1x1) mipmap level
const size_t data_padding = (m_Flags & TEX_DXT)? 4 : 1;
size_t last_level_size = (size_t)(data_padding * data_padding * m_Bpp/8);
// construct a new texture based on the current one,
// but only include the last mipmap level
// do this so that we can use the general conversion methods for the pixel data
Tex basetex = *this;
uint8_t *data = new uint8_t[last_level_size];
memcpy(data, m_Data.get() + m_Ofs + size - last_level_size, last_level_size);
shared_ptr<uint8_t> sdata(data, ArrayDeleter());
basetex.wrap(1, 1, m_Bpp, m_Flags, sdata, 0);
// convert to BGRA
WARN_IF_ERR(basetex.transform_to(TEX_BGR | TEX_ALPHA));
// extract components into u32
ENSURE(basetex.m_DataSize >= basetex.m_Ofs+4);
u8 b = basetex.m_Data.get()[basetex.m_Ofs];
u8 g = basetex.m_Data.get()[basetex.m_Ofs+1];
u8 r = basetex.m_Data.get()[basetex.m_Ofs+2];
u8 a = basetex.m_Data.get()[basetex.m_Ofs+3];
return b + (g << 8) + (r << 16) + (a << 24);
}
static void add_level_size(size_t UNUSED(level), size_t UNUSED(level_w), size_t UNUSED(level_h), const u8* RESTRICT UNUSED(level_data), size_t level_dataSize, void* RESTRICT cbData)
{
size_t* ptotal_size = (size_t*)cbData;
*ptotal_size += level_dataSize;
}
// return total byte size of the image pixels. (including mipmaps!)
// this is preferable to calculating manually because it's
// less error-prone (e.g. confusing bits_per_pixel with bytes).
size_t Tex::img_size() const
{
// (can't use normal CHECK_TEX due to size_t return value)
WARN_IF_ERR(validate());
const int levels_to_skip = (m_Flags & TEX_MIPMAPS)? 0 : TEX_BASE_LEVEL_ONLY;
const size_t data_padding = (m_Flags & TEX_DXT)? 4 : 1;
size_t out_size = 0;
tex_util_foreach_mipmap(m_Width, m_Height, m_Bpp, 0, levels_to_skip, data_padding, add_level_size, &out_size);
return out_size;
}
// return the minimum header size (i.e. offset to pixel data) of the
// file format indicated by <fn>'s extension (that is all it need contain:
// e.g. ".bmp"). returns 0 on error (i.e. no codec found).
// this can be used to optimize calls to tex_write: when allocating the
// buffer that will hold the image, allocate this much extra and
// pass the pointer as base+hdr_size. this allows writing the header
// directly into the output buffer and makes for zero-copy IO.
size_t tex_hdr_size(const VfsPath& filename)
{
const ITexCodec* c;
const OsPath extension = filename.Extension();
WARN_RETURN_STATUS_IF_ERR(tex_codec_for_filename(extension, &c));
return c->hdr_size(0);
}
//-----------------------------------------------------------------------------
// read/write from memory and disk
//-----------------------------------------------------------------------------
Status Tex::decode(const shared_ptr<u8>& Data, size_t DataSize)
{
const ITexCodec* c;
RETURN_STATUS_IF_ERR(tex_codec_for_header(Data.get(), DataSize, &c));
// make sure the entire header is available
const size_t min_hdr_size = c->hdr_size(0);
if(DataSize < min_hdr_size)
WARN_RETURN(ERR::TEX_INCOMPLETE_HEADER);
const size_t hdr_size = c->hdr_size(Data.get());
if(DataSize < hdr_size)
WARN_RETURN(ERR::TEX_INCOMPLETE_HEADER);
m_Data = Data;
m_DataSize = DataSize;
m_Ofs = hdr_size;
RETURN_STATUS_IF_ERR(c->decode(Data.get(), DataSize, this));
// sanity checks
if(!m_Width || !m_Height || m_Bpp > 32)
WARN_RETURN(ERR::TEX_FMT_INVALID);
if(m_DataSize < m_Ofs + img_size())
WARN_RETURN(ERR::TEX_INVALID_SIZE);
flip_to_global_orientation(this);
CHECK_TEX(this);
return INFO::OK;
}
Status Tex::encode(const OsPath& extension, DynArray* da)
{
CHECK_TEX(this);
WARN_RETURN_STATUS_IF_ERR(tex_validate_plain_format(m_Bpp, m_Flags));
// we could be clever here and avoid the extra alloc if our current
// memory block ensued from the same kind of texture file. this is
// most likely the case if in_img == get_data() + c->hdr_size(0).
// this would make for zero-copy IO.
const size_t max_out_size = img_size()*4 + 256*KiB;
RETURN_STATUS_IF_ERR(da_alloc(da, max_out_size));
const ITexCodec* c;
WARN_RETURN_STATUS_IF_ERR(tex_codec_for_filename(extension, &c));
// encode into <da>
Status err = c->encode(this, da);
if(err < 0)
{
(void)da_free(da);
WARN_RETURN(err);
}
return INFO::OK;
}
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