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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup imbdds
*/
#include "BLI_utildefines.h"
#include <DirectDrawSurface.h>
#include <FlipDXT.h>
#include <Stream.h>
#include <cstddef>
#include <cstdio> /* printf */
#include <dds_api.h>
#include <fstream>
#if defined(WIN32)
# include "utfconv.h"
#endif
#include "IMB_allocimbuf.h"
#include "IMB_imbuf.h"
#include "IMB_imbuf_types.h"
#include "imbuf.h"
#include "IMB_colormanagement.h"
#include "IMB_colormanagement_intern.h"
extern "C" {
bool imb_save_dds(struct ImBuf *ibuf, const char *name, int /*flags*/)
{
return false; /* TODO: finish this function. */
/* check image buffer */
if (ibuf == nullptr) {
return false;
}
if (ibuf->rect == nullptr) {
return false;
}
/* open file for writing */
std::ofstream fildes;
#if defined(WIN32)
wchar_t *wname = alloc_utf16_from_8(name, 0);
fildes.open(wname);
free(wname);
#else
fildes.open(name);
#endif
/* write header */
fildes << "DDS ";
fildes.close();
return true;
}
bool imb_is_a_dds(const uchar *mem, const size_t size)
{
if (size < 8) {
return false;
}
/* heuristic check to see if mem contains a DDS file */
/* header.fourcc == FOURCC_DDS */
if ((mem[0] != 'D') || (mem[1] != 'D') || (mem[2] != 'S') || (mem[3] != ' ')) {
return false;
}
/* header.size == 124 */
if ((mem[4] != 124) || mem[5] || mem[6] || mem[7]) {
return false;
}
return true;
}
struct ImBuf *imb_load_dds(const uchar *mem, size_t size, int flags, char colorspace[IM_MAX_SPACE])
{
struct ImBuf *ibuf = nullptr;
DirectDrawSurface dds((uchar *)mem, size); /* reads header */
uchar bits_per_pixel;
uint *rect;
Image img;
uint numpixels = 0;
int col;
uchar *cp = (uchar *)&col;
Color32 pixel;
Color32 *pixels = nullptr;
/* OCIO_TODO: never was able to save DDS, so can't test loading
* but profile used to be set to sRGB and can't see rect_float here, so
* default byte space should work fine
*/
colorspace_set_default_role(colorspace, IM_MAX_SPACE, COLOR_ROLE_DEFAULT_BYTE);
if (!imb_is_a_dds(mem, size)) {
return nullptr;
}
/* check if DDS is valid and supported */
if (!dds.isValid()) {
/* no need to print error here, just testing if it is a DDS */
if (flags & IB_test) {
return nullptr;
}
printf("DDS: not valid; header follows\n");
dds.printInfo();
return nullptr;
}
if (!dds.isSupported()) {
printf("DDS: format not supported\n");
return nullptr;
}
if ((dds.width() > 65535) || (dds.height() > 65535)) {
printf("DDS: dimensions too large\n");
return nullptr;
}
/* convert DDS into ImBuf */
dds.mipmap(&img, 0, 0); /* load first face, first mipmap */
pixels = img.pixels();
numpixels = dds.width() * dds.height();
bits_per_pixel = 24;
if (img.format() == Image::Format_ARGB) {
/* check that there is effectively an alpha channel */
for (uint i = 0; i < numpixels; i++) {
pixel = pixels[i];
if (pixel.a != 255) {
bits_per_pixel = 32;
break;
}
}
}
ibuf = IMB_allocImBuf(dds.width(), dds.height(), bits_per_pixel, 0);
if (ibuf == nullptr) {
return nullptr; /* memory allocation failed */
}
ibuf->ftype = IMB_FTYPE_DDS;
ibuf->dds_data.fourcc = dds.fourCC();
ibuf->dds_data.nummipmaps = dds.mipmapCount();
if ((flags & IB_test) == 0) {
if (!imb_addrectImBuf(ibuf)) {
return ibuf;
}
if (ibuf->rect == nullptr) {
return ibuf;
}
rect = ibuf->rect;
cp[3] = 0xff; /* default alpha if alpha channel is not present */
for (uint i = 0; i < numpixels; i++) {
pixel = pixels[i];
cp[0] = pixel.r; /* set R component of col */
cp[1] = pixel.g; /* set G component of col */
cp[2] = pixel.b; /* set B component of col */
if (dds.hasAlpha()) {
cp[3] = pixel.a; /* set A component of col */
}
rect[i] = col;
}
if (ibuf->dds_data.fourcc != FOURCC_DDS) {
ibuf->dds_data.data = (uchar *)dds.readData(ibuf->dds_data.size);
/* flip compressed texture */
if (ibuf->dds_data.data) {
FlipDXTCImage(dds.width(),
dds.height(),
ibuf->dds_data.nummipmaps,
dds.fourCC(),
ibuf->dds_data.data,
ibuf->dds_data.size,
&ibuf->dds_data.nummipmaps);
}
}
else {
ibuf->dds_data.data = nullptr;
ibuf->dds_data.size = 0;
}
/* flip uncompressed texture */
IMB_flipy(ibuf);
}
return ibuf;
}
} /* extern "C" */
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