public static sbyte *stbi_zlib_decode_noheader_malloc(sbyte *buffer, int len, int *outlen)
{
var a = new stbi__zbuf();
var p = (sbyte *)stbi__malloc((ulong)16384);
if (p == null)
{
return(null);
}
a.zbuffer = (byte *)buffer;
a.zbuffer_end = (byte *)buffer + len;
if (stbi__do_zlib(&a, p, 16384, 1, 0) != 0)
{
if (outlen != null)
{
*outlen = (int)(a.zout - a.zout_start);
}
return(a.zout_start);
}
CRuntime.free(a.zout_start);
return(null);
}
public int InsertNode(int idx, int x, int y, int w)
{
if (NodesNumber + 1 > NodesCount)
{
NodesCount = NodesCount == 0 ? 8 : NodesCount * 2;
Nodes = (FontAtlasNode *)CRuntime.realloc(Nodes, (ulong)(sizeof(FontAtlasNode) * NodesCount));
if (Nodes == null)
{
return(0);
}
}
for (var i = NodesNumber; i > idx; i--)
{
Nodes[i] = Nodes[i - 1];
}
Nodes[idx].X = (short)x;
Nodes[idx].Y = (short)y;
Nodes[idx].Width = (short)w;
NodesNumber++;
return(1);
}
public static sbyte *stbi_zlib_decode_malloc_guesssize_headerflag(sbyte *buffer, int len, int initial_size, int *outlen, int parse_header)
{
var a = new stbi__zbuf();
var p = (sbyte *)stbi__malloc((ulong)initial_size);
if (p == null)
{
return(null);
}
a.zbuffer = (byte *)buffer;
a.zbuffer_end = (byte *)buffer + len;
if (stbi__do_zlib(&a, p, initial_size, 1, parse_header) != 0)
{
if (outlen != null)
{
*outlen = (int)(a.zout - a.zout_start);
}
return(a.zout_start);
}
CRuntime.free(a.zout_start);
return(null);
}
public static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel)
{
var row = 0;
var bytes_per_row = (ulong)(w * bytes_per_pixel);
var temp = stackalloc byte[2048];
var bytes = (byte *)image;
for (row = 0; row < h >> 1; row++)
{
var row0 = bytes + (ulong)row * bytes_per_row;
var row1 = bytes + (ulong)(h - row - 1) * bytes_per_row;
var bytes_left = bytes_per_row;
while (bytes_left != 0)
{
var bytes_copy = (bytes_left < 2048) ? bytes_left : 2048;
CRuntime.memcpy(temp, row0, bytes_copy);
CRuntime.memcpy(row0, row1, bytes_copy);
CRuntime.memcpy(row1, temp, bytes_copy);
row0 += bytes_copy;
row1 += bytes_copy;
bytes_left -= bytes_copy;
}
}
}
public static void *stbi__psd_load(stbi__context s, int *x, int *y, int *comp,
int req_comp, stbi__result_info *ri, int bpc)
{
var pixelCount = 0;
var channelCount = 0;
var compression = 0;
var channel = 0;
var i = 0;
var bitdepth = 0;
var w = 0;
var h = 0;
byte *_out_;
if (stbi__get32be(s) != 0x38425053)
{
return((byte *)(ulong)((stbi__err("not PSD") != 0) ? (byte *)null : null));
}
if (stbi__get16be(s) != 1)
{
return((byte *)(ulong)((stbi__err("wrong version") != 0) ? (byte *)null : null));
}
stbi__skip(s, 6);
channelCount = stbi__get16be(s);
if ((channelCount < 0) || (channelCount > 16))
{
return((byte *)(ulong)((stbi__err("wrong channel count") != 0) ? (byte *)null : null));
}
h = (int)stbi__get32be(s);
w = (int)stbi__get32be(s);
bitdepth = stbi__get16be(s);
if ((bitdepth != 8) && (bitdepth != 16))
{
return((byte *)(ulong)((stbi__err("unsupported bit depth") != 0) ? (byte *)null : null));
}
if (stbi__get16be(s) != 3)
{
return((byte *)(ulong)((stbi__err("wrong color format") != 0) ? (byte *)null : null));
}
stbi__skip(s, (int)stbi__get32be(s));
stbi__skip(s, (int)stbi__get32be(s));
stbi__skip(s, (int)stbi__get32be(s));
compression = stbi__get16be(s);
if (compression > 1)
{
return((byte *)(ulong)((stbi__err("bad compression") != 0) ? (byte *)null : null));
}
if (stbi__mad3sizes_valid(4, w, h, 0) == 0)
{
return((byte *)(ulong)((stbi__err("too large") != 0) ? (byte *)null : null));
}
if ((compression == 0) && (bitdepth == 16) && (bpc == 16))
{
_out_ = (byte *)stbi__malloc_mad3(8, w, h, 0);
ri->bits_per_channel = 16;
}
else
{
_out_ = (byte *)stbi__malloc((ulong)(4 * w * h));
}
if (_out_ == null)
{
return((byte *)(ulong)((stbi__err("outofmem") != 0) ? (byte *)null : null));
}
pixelCount = w * h;
if (compression != 0)
{
stbi__skip(s, h * channelCount * 2);
for (channel = 0; channel < 4; channel++)
{
byte *p;
p = _out_ + channel;
if (channel >= channelCount)
{
for (i = 0; i < pixelCount; i++, p += 4)
{
*p = (byte)((channel == 3) ? 255 : 0);
}
}
else
{
if (stbi__psd_decode_rle(s, p, pixelCount) == 0)
{
CRuntime.free(_out_);
return((byte *)(ulong)((stbi__err("corrupt") != 0) ? (byte *)null : null));
}
}
}
}
else
{
for (channel = 0; channel < 4; channel++)
{
if (channel >= channelCount)
{
if ((bitdepth == 16) && (bpc == 16))
{
var q = (ushort *)_out_ + channel;
var val = (ushort)((channel == 3) ? 65535 : 0);
for (i = 0; i < pixelCount; i++, q += 4)
{
*q = val;
}
}
else
{
var p = _out_ + channel;
var val = (byte)((channel == 3) ? 255 : 0);
for (i = 0; i < pixelCount; i++, p += 4)
{
*p = val;
}
}
}
else
{
if (ri->bits_per_channel == 16)
{
var q = (ushort *)_out_ + channel;
for (i = 0; i < pixelCount; i++, q += 4)
{
*q = (ushort)stbi__get16be(s);
}
}
else
{
var p = _out_ + channel;
if (bitdepth == 16)
{
for (i = 0; i < pixelCount; i++, p += 4)
{
*p = (byte)(stbi__get16be(s) >> 8);
}
}
else
{
for (i = 0; i < pixelCount; i++, p += 4)
{
*p = stbi__get8(s);
}
}
}
}
}
}
if (channelCount >= 4)
{
if (ri->bits_per_channel == 16)
{
for (i = 0; i < w * h; ++i)
{
var pixel = (ushort *)_out_ + 4 * i;
if ((pixel[3] != 0) && (pixel[3] != 65535))
{
var a = pixel[3] / 65535.0f;
var ra = 1.0f / a;
var inv_a = 65535.0f * (1 - ra);
pixel[0] = (ushort)(pixel[0] * ra + inv_a);
pixel[1] = (ushort)(pixel[1] * ra + inv_a);
pixel[2] = (ushort)(pixel[2] * ra + inv_a);
}
}
}
else
{
for (i = 0; i < w * h; ++i)
{
var pixel = _out_ + 4 * i;
if ((pixel[3] != 0) && (pixel[3] != 255))
{
var a = pixel[3] / 255.0f;
var ra = 1.0f / a;
var inv_a = 255.0f * (1 - ra);
pixel[0] = (byte)(pixel[0] * ra + inv_a);
pixel[1] = (byte)(pixel[1] * ra + inv_a);
pixel[2] = (byte)(pixel[2] * ra + inv_a);
}
}
}
}
if ((req_comp != 0) && (req_comp != 4))
{
if (ri->bits_per_channel == 16)
{
_out_ = (byte *)stbi__convert_format16((ushort *)_out_, 4, req_comp, (uint)w, (uint)h);
}
else
{
_out_ = stbi__convert_format(_out_, 4, req_comp, (uint)w, (uint)h);
}
if (_out_ == null)
{
return(_out_);
}
}
if (comp != null)
{
*comp = 4;
}
*y = h;
*x = w;
return(_out_);
}
public static void *stbi__load_gif_main(stbi__context s, int **delays, int *x, int *y, int *z, int *comp, int req_comp)
{
if (stbi__gif_test(s) != 0)
{
var layers = 0;
byte *u = null;
byte *_out_ = null;
byte *two_back = null;
var g = new stbi__gif();
var stride = 0;
if (delays != null)
{
*delays = null;
}
do
{
u = stbi__gif_load_next(s, g, comp, req_comp, two_back);
if (u != null)
{
*x = g.w;
*y = g.h;
++layers;
stride = g.w * g.h * 4;
if (_out_ != null)
{
_out_ = (byte *)CRuntime.realloc(_out_, (ulong)(layers * stride));
if (delays != null)
{
*delays = (int *)CRuntime.realloc(*delays, (ulong)(sizeof(int) * layers));
}
}
else
{
_out_ = (byte *)stbi__malloc((ulong)(layers * stride));
if (delays != null)
{
*delays = (int *)stbi__malloc((ulong)(layers * sizeof(int)));
}
}
CRuntime.memcpy(_out_ + (layers - 1) * stride, u, (ulong)stride);
if (layers >= 2)
{
two_back = _out_ - 2 * stride;
}
if (delays != null)
{
(*delays)[layers - 1U] = g.delay;
}
}
}while(u != null);
CRuntime.free(g._out_);
CRuntime.free(g.history);
CRuntime.free(g.background);
if ((req_comp != 0) && (req_comp != 4))
{
_out_ = stbi__convert_format(_out_, 4, req_comp, (uint)(layers * g.w), (uint)g.h);
}
*z = layers;
return(_out_);
}
return((byte *)(ulong)((stbi__err("not GIF") != 0) ? (byte *)null : null));
}
public static byte *stbi__gif_load_next(stbi__context s, stbi__gif g, int *comp, int req_comp, byte *two_back)
{
var dispose = 0;
var first_frame = 0;
var pi = 0;
var pcount = 0;
first_frame = 0;
if (g._out_ == null)
{
if (stbi__gif_header(s, g, comp, 0) == 0)
{
return(null);
}
if (stbi__mad3sizes_valid(4, g.w, g.h, 0) == 0)
{
return((byte *)(ulong)((stbi__err("too large") != 0) ? (byte *)null : null));
}
pcount = g.w * g.h;
g._out_ = (byte *)stbi__malloc((ulong)(4 * pcount));
g.background = (byte *)stbi__malloc((ulong)(4 * pcount));
g.history = (byte *)stbi__malloc((ulong)pcount);
if ((g._out_ == null) || (g.background == null) || (g.history == null))
{
return((byte *)(ulong)((stbi__err("outofmem") != 0) ? (byte *)null : null));
}
CRuntime.memset(g._out_, 0x00, (ulong)(4 * pcount));
CRuntime.memset(g.background, 0x00, (ulong)(4 * pcount));
CRuntime.memset(g.history, 0x00, (ulong)pcount);
first_frame = 1;
}
else
{
dispose = (g.eflags & 0x1C) >> 2;
pcount = g.w * g.h;
if ((dispose == 3) && (two_back == null))
{
dispose = 2;
}
if (dispose == 3)
{
for (pi = 0; pi < pcount; ++pi)
{
if (g.history[pi] != 0)
{
CRuntime.memcpy(&g._out_[pi * 4], &two_back[pi * 4], (ulong)4);
}
}
}
else
{
if (dispose == 2)
{
for (pi = 0; pi < pcount; ++pi)
{
if (g.history[pi] != 0)
{
CRuntime.memcpy(&g._out_[pi * 4], &g.background[pi * 4], (ulong)4);
}
}
}
}
CRuntime.memcpy(g.background, g._out_, (ulong)(4 * g.w * g.h));
}
CRuntime.memset(g.history, 0x00, (ulong)(g.w * g.h));
for (; ;)
{
var tag = (int)stbi__get8(s);
switch (tag)
{
case 0x2C:
{
var x = 0;
var y = 0;
var w = 0;
var h = 0;
byte *o;
x = stbi__get16le(s);
y = stbi__get16le(s);
w = stbi__get16le(s);
h = stbi__get16le(s);
if (((x + w) > g.w) || ((y + h) > g.h))
{
return((byte *)(ulong)((stbi__err("bad Image Descriptor") != 0) ? (byte *)null : null));
}
g.line_size = g.w * 4;
g.start_x = x * 4;
g.start_y = y * g.line_size;
g.max_x = g.start_x + w * 4;
g.max_y = g.start_y + h * g.line_size;
g.cur_x = g.start_x;
g.cur_y = g.start_y;
if (w == 0)
{
g.cur_y = g.max_y;
}
g.lflags = stbi__get8(s);
if ((g.lflags & 0x40) != 0)
{
g.step = 8 * g.line_size;
g.parse = 3;
}
else
{
g.step = g.line_size;
g.parse = 0;
}
if ((g.lflags & 0x80) != 0)
{
stbi__gif_parse_colortable(s, g.lpal, 2 << (g.lflags & 7), (g.eflags & 0x01) != 0 ? g.transparent : -1);
g.color_table = g.lpal;
}
else
{
if ((g.flags & 0x80) != 0)
{
g.color_table = g.pal;
}
else
{
return((byte *)(ulong)((stbi__err("missing color table") != 0) ? (byte *)null : null));
}
}
o = stbi__process_gif_raster(s, g);
if (o == null)
{
return(null);
}
pcount = g.w * g.h;
if (first_frame != 0 && g.bgindex > 0)
{
for (pi = 0; pi < pcount; ++pi)
{
if (g.history[pi] == 0)
{
g.pal[g.bgindex * 4 + 3] = 255;
CRuntime.memcpy(&g._out_[pi * 4], &g.pal[g.bgindex], (ulong)4);
}
}
}
return(o);
}
case 0x21:
{
var len = 0;
var ext = (int)stbi__get8(s);
if (ext == 0xF9)
{
len = stbi__get8(s);
if (len == 4)
{
g.eflags = stbi__get8(s);
g.delay = 10 * stbi__get16le(s);
if (g.transparent >= 0)
{
g.pal[g.transparent * 4 + 3] = 255;
}
if ((g.eflags & 0x01) != 0)
{
g.transparent = stbi__get8(s);
if (g.transparent >= 0)
{
g.pal[g.transparent * 4 + 3] = 0;
}
}
else
{
stbi__skip(s, 1);
g.transparent = -1;
}
}
else
{
stbi__skip(s, len);
break;
}
}
while ((len = stbi__get8(s)) != 0)
{
stbi__skip(s, len);
}
break;
}
case 0x3B:
{
return(null);
}
default:
{
return((byte *)(ulong)((stbi__err("unknown code") != 0) ? (byte *)null : null));
}
}
}
}
public void ExpandAtlas(int width, int height)
{
var i = 0;
var maxy = 0;
width = Math.Max(width, _params_.Width);
height = Math.Max(height, _params_.Height);
if (width == _params_.Width && height == _params_.Height)
{
return;
}
Texture = null;
var data = new byte[width * height];
for (i = 0; i < _params_.Height; i++)
{
fixed(byte *dst = &data[i *width])
{
fixed(byte *src = &_texData[i *_params_.Width])
{
CRuntime.memcpy(dst, src, (ulong)_params_.Width);
if (width > _params_.Width)
{
CRuntime.memset(dst + _params_.Width, 0, (ulong)(width - _params_.Width));
}
}
}
}
if (height > _params_.Height)
{
Array.Clear(data, _params_.Height * width, (height - _params_.Height) * width);
}
_texData = data;
_colorData = new Color[width * height];
for (i = 0; i < width * height; ++i)
{
_colorData[i].R = _texData[i];
_colorData[i].G = _texData[i];
_colorData[i].B = _texData[i];
_colorData[i].A = _texData[i];
}
_atlas.Expand(width, height);
for (i = 0; i < _atlas.NodesNumber; i++)
{
maxy = Math.Max(maxy, _atlas.Nodes[i].Y);
}
_dirtyRect[0] = 0;
_dirtyRect[1] = 0;
_dirtyRect[2] = _params_.Width;
_dirtyRect[3] = maxy;
_params_.Width = width;
_params_.Height = height;
_itw = 1.0f / _params_.Width;
_ith = 1.0f / _params_.Height;
}
public static void *stbi__load_gif_main(StbiContext s, int **delays, int *x, int *y, int *z, int *comp,
int reqComp)
{
if (stbi__gif_test(s) != 0)
{
var layers = 0;
byte *u = null;
byte *out_ = null;
byte *two_back = null;
var g = new StbiGif();
var stride = 0;
if (delays != null)
{
*delays = null;
}
do
{
u = stbi__gif_load_next(s, g, comp, reqComp, two_back);
if (u != null)
{
*x = g.W;
*y = g.H;
++layers;
stride = g.W * g.H * 4;
if (out_ != null)
{
out_ = (byte *)CRuntime.Realloc(out_, (ulong)(layers * stride));
if (delays != null)
{
*delays = (int *)CRuntime.Realloc(*delays, (ulong)(sizeof(int) * layers));
}
}
else
{
out_ = (byte *)stbi__malloc((ulong)(layers * stride));
if (delays != null)
{
*delays = (int *)stbi__malloc((ulong)(layers * sizeof(int)));
}
}
CRuntime.Memcpy(out_ + (layers - 1) * stride, u, (ulong)stride);
if (layers >= 2)
{
two_back = out_ - 2 * stride;
}
if (delays != null)
{
(*delays)[layers - 1U] = g.Delay;
}
}
} while (u != null);
CRuntime.Free(g.Out);
CRuntime.Free(g.History);
CRuntime.Free(g.Background);
if (reqComp != 0 && reqComp != 4)
{
out_ = stbi__convert_format(out_, 4, reqComp, (uint)(layers * g.W), (uint)g.H);
}
*z = layers;
return(out_);
}
return((byte *)(ulong)(stbi__err("not GIF") != 0 ? (byte *)null : null));
}
public static IMemoryHolder Load(BinReader s, ReadState ri)
{
var info = new PsdInfo();
if (!ParseHeader(s, ri, ref info))
{
return(null);
}
if (AreValidMad3Sizes(4, ri.Width, ri.Height, 0) == 0)
{
s.Error(ErrorCode.TooLarge);
return(null);
}
byte *_out_ = (byte *)MAllocMad3((4 * ri.OutDepth + 7) / 8, ri.Width, ri.Height, 0);
if (_out_ == null)
{
s.Error(ErrorCode.OutOfMemory);
return(null);
}
int pixelCount = ri.Width * ri.Height;
if (info.compression != 0)
{
s.Skip(ri.Height * info.channelCount * 2);
for (int channel = 0; channel < 4; channel++)
{
byte *dst;
dst = _out_ + channel;
if (channel >= info.channelCount)
{
for (int i = 0; i < pixelCount; i++, dst += 4)
{
*dst = (byte)(channel == 3 ? 255 : 0);
}
}
else
{
if (!DecodeRLE(s, dst, pixelCount))
{
CRuntime.Free(_out_);
throw new StbImageReadException(ErrorCode.Corrupt);
}
}
}
}
else
{
for (int channel = 0; channel < 4; channel++)
{
if (channel >= info.channelCount)
{
if (ri.Depth == 16)
{
ushort *q = ((ushort *)_out_) + channel;
ushort val = (ushort)(channel == 3 ? 65535 : 0);
for (int i = 0; i < pixelCount; i++, q += 4)
{
*q = val;
}
}
else
{
byte *p = _out_ + channel;
byte val = (byte)(channel == 3 ? 255 : 0);
for (int i = 0; i < pixelCount; i++, p += 4)
{
*p = val;
}
}
}
else
{
if (ri.OutDepth == 16)
{
ushort *q = ((ushort *)_out_) + channel;
for (int i = 0; i < pixelCount; i++, q += 4)
{
*q = (ushort)s.ReadInt16BE();
}
}
else
{
byte *p = _out_ + channel;
if (ri.OutDepth == 16)
{
for (int i = 0; i < pixelCount; i++, p += 4)
{
*p = (byte)(s.ReadInt16BE() >> 8);
}
}
else
{
for (int i = 0; i < pixelCount; i++, p += 4)
{
*p = s.ReadByte();
}
}
}
}
}
}
if (info.channelCount >= 4)
{
if (ri.OutDepth == 16)
{
for (int i = 0; i < pixelCount; ++i)
{
ushort *pixel = (ushort *)_out_ + 4 * i;
if ((pixel[3] != 0) && (pixel[3] != 65535))
{
float a = pixel[3] / 65535.0f;
float ra = 1f / a;
float inv_a = 65535.0f * (1 - ra);
pixel[0] = (ushort)(pixel[0] * ra + inv_a);
pixel[1] = (ushort)(pixel[1] * ra + inv_a);
pixel[2] = (ushort)(pixel[2] * ra + inv_a);
}
}
}
else
{
for (int i = 0; i < pixelCount; ++i)
{
byte *pixel = _out_ + 4 * i;
if ((pixel[3] != 0) && (pixel[3] != 255))
{
float a = pixel[3] / 255f;
float ra = 1f / a;
float inv_a = 255f * (1 - ra);
pixel[0] = (byte)(pixel[0] * ra + inv_a);
pixel[1] = (byte)(pixel[1] * ra + inv_a);
pixel[2] = (byte)(pixel[2] * ra + inv_a);
}
}
}
}
IMemoryHolder result = new HGlobalMemoryHolder(
_out_, (ri.Width * ri.Height * ri.OutComponents * ri.OutDepth + 7) / 8);
var errorCode = ConvertFormat(result, ri, out var convertedResult);
if (errorCode != ErrorCode.Ok)
{
return(null);
}
return(convertedResult);
}
public static float *stbi__hdr_load(stbi__context s, int *x, int *y, int *comp, int req_comp,
stbi__result_info *ri)
{
var buffer = stackalloc sbyte[1024];
sbyte *token;
var valid = 0;
var width = 0;
var height = 0;
byte * scanline;
float *hdr_data;
var len = 0;
byte count = 0;
byte value = 0;
var i = 0;
var j = 0;
var k = 0;
var c1 = 0;
var c2 = 0;
var z = 0;
sbyte *headerToken;
headerToken = stbi__hdr_gettoken(s, buffer);
if (CRuntime.strcmp(headerToken, "#?RADIANCE") != 0 && CRuntime.strcmp(headerToken, "#?RGBE") != 0)
{
return((float *)(ulong)(stbi__err("not HDR") != 0 ? (byte *)null : null));
}
for (; ;)
{
token = stbi__hdr_gettoken(s, buffer);
if (token[0] == 0)
{
break;
}
if (CRuntime.strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0)
{
valid = 1;
}
}
if (valid == 0)
{
return((float *)(ulong)(stbi__err("unsupported format") != 0 ? (byte *)null : null));
}
token = stbi__hdr_gettoken(s, buffer);
if (CRuntime.strncmp(token, "-Y ", (ulong)3) != 0)
{
return((float *)(ulong)(stbi__err("unsupported data layout") != 0 ? (byte *)null : null));
}
token += 3;
height = (int)CRuntime.strtol(token, &token, 10);
while (*token == ' ')
{
++token;
}
if (CRuntime.strncmp(token, "+X ", (ulong)3) != 0)
{
return((float *)(ulong)(stbi__err("unsupported data layout") != 0 ? (byte *)null : null));
}
token += 3;
width = (int)CRuntime.strtol(token, null, 10);
*x = width;
*y = height;
if (comp != null)
{
*comp = 3;
}
if (req_comp == 0)
{
req_comp = 3;
}
if (stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0) == 0)
{
return((float *)(ulong)(stbi__err("too large") != 0 ? (byte *)null : null));
}
hdr_data = (float *)stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
if (hdr_data == null)
{
return((float *)(ulong)(stbi__err("outofmem") != 0 ? (byte *)null : null));
}
main_decode_loop:
var enterMainDecode = false;
if (enterMainDecode)
{
for (; j < height; ++j)
{
for (; i < width; ++i)
{
var rgbe = stackalloc byte[4];
stbi__getn(s, rgbe, 4);
stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
}
}
goto finish;
}
if (width < 8 || width >= 32768)
{
i = j = 0;
enterMainDecode = true;
goto main_decode_loop;
}
else
{
scanline = null;
for (j = 0; j < height; ++j)
{
c1 = stbi__get8(s);
c2 = stbi__get8(s);
len = stbi__get8(s);
if (c1 != 2 || c2 != 2 || (len & 0x80) != 0)
{
var rgbe = stackalloc byte[4];
rgbe[0] = (byte)c1;
rgbe[1] = (byte)c2;
rgbe[2] = (byte)len;
rgbe[3] = stbi__get8(s);
stbi__hdr_convert(hdr_data, rgbe, req_comp);
i = 1;
j = 0;
CRuntime.free(scanline);
enterMainDecode = true;
goto main_decode_loop;
}
len <<= 8;
len |= stbi__get8(s);
if (len != width)
{
CRuntime.free(hdr_data);
CRuntime.free(scanline);
return((float *)(ulong)(stbi__err("invalid decoded scanline length") != 0
? (byte *)null
: null));
}
if (scanline == null)
{
scanline = (byte *)stbi__malloc_mad2(width, 4, 0);
if (scanline == null)
{
CRuntime.free(hdr_data);
return((float *)(ulong)(stbi__err("outofmem") != 0 ? (byte *)null : null));
}
}
for (k = 0; k < 4; ++k)
{
var nleft = 0;
i = 0;
while ((nleft = width - i) > 0)
{
count = stbi__get8(s);
if (count > 128)
{
value = stbi__get8(s);
count -= 128;
if (count > nleft)
{
CRuntime.free(hdr_data);
CRuntime.free(scanline);
return((float *)(ulong)(stbi__err("corrupt") != 0 ? (byte *)null : null));
}
for (z = 0; z < count; ++z)
{
scanline[i++ *4 + k] = value;
}
}
else
{
if (count > nleft)
{
CRuntime.free(hdr_data);
CRuntime.free(scanline);
return((float *)(ulong)(stbi__err("corrupt") != 0 ? (byte *)null : null));
}
for (z = 0; z < count; ++z)
{
scanline[i++ *4 + k] = stbi__get8(s);
}
}
}
}
for (i = 0; i < width; ++i)
{
stbi__hdr_convert(hdr_data + (j * width + i) * req_comp, scanline + i * 4, req_comp);
}
}
if (scanline != null)
{
CRuntime.free(scanline);
}
}
finish:
return(hdr_data);
}
public static int stbi__zbuild_huffman(stbi__zhuffman *z, byte *sizelist, int num)
{
var i = 0;
var k = 0;
var code = 0;
var next_code = stackalloc int[16];
var sizes = stackalloc int[17];
CRuntime.memset(sizes, 0, (ulong)sizeof(int));
CRuntime.memset(z->fast, 0, (ulong)((1 << 9) * sizeof(ushort)));
for (i = 0; i < num; ++i)
{
++sizes[sizelist[i]];
}
sizes[0] = 0;
for (i = 1; i < 16; ++i)
{
if (sizes[i] > (1 << i))
{
return(stbi__err("bad sizes"));
}
}
code = 0;
for (i = 1; i < 16; ++i)
{
next_code[i] = code;
z->firstcode[i] = (ushort)code;
z->firstsymbol[i] = (ushort)k;
code = code + sizes[i];
if (sizes[i] != 0)
{
if ((code - 1) >= (1 << i))
{
return(stbi__err("bad codelengths"));
}
}
z->maxcode[i] = code << (16 - i);
code <<= 1;
k += sizes[i];
}
z->maxcode[16] = 0x10000;
for (i = 0; i < num; ++i)
{
var s = (int)sizelist[i];
if (s != 0)
{
var c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
var fastv = (ushort)((s << 9) | i);
z->size[c] = (byte)s;
z->value[c] = (ushort)i;
if (s <= 9)
{
var j = stbi__bit_reverse(next_code[s], s);
while (j < (1 << 9))
{
z->fast[j] = fastv;
j += 1 << s;
}
}
++next_code[s];
}
}
return(1);
}
public static int stbi__compute_huffman_codes(stbi__zbuf *a)
{
var z_codelength = new stbi__zhuffman();
var lencodes = stackalloc byte[286 + 32 + 137];
var codelength_sizes = stackalloc byte[19];
var i = 0;
var n = 0;
var hlit = (int)(stbi__zreceive(a, 5) + 257);
var hdist = (int)(stbi__zreceive(a, 5) + 1);
var hclen = (int)(stbi__zreceive(a, 4) + 4);
var ntot = hlit + hdist;
CRuntime.memset(codelength_sizes, 0, (ulong)(19 * sizeof(byte)));
for (i = 0; i < hclen; ++i)
{
var s = (int)stbi__zreceive(a, 3);
codelength_sizes[length_dezigzag[i]] = (byte)s;
}
if (stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19) == 0)
{
return(0);
}
n = 0;
while (n < ntot)
{
var c = stbi__zhuffman_decode(a, &z_codelength);
if ((c < 0) || (c >= 19))
{
return(stbi__err("bad codelengths"));
}
if (c < 16)
{
lencodes[n++] = (byte)c;
}
else
{
var fill = (byte)0;
if (c == 16)
{
c = (int)(stbi__zreceive(a, 2) + 3);
if (n == 0)
{
return(stbi__err("bad codelengths"));
}
fill = lencodes[n - 1];
}
else
{
if (c == 17)
{
c = (int)(stbi__zreceive(a, 3) + 3);
}
else
{
c = (int)(stbi__zreceive(a, 7) + 11);
}
}
if ((ntot - n) < c)
{
return(stbi__err("bad codelengths"));
}
CRuntime.memset(lencodes + n, fill, (ulong)c);
n += c;
}
}
if (n != ntot)
{
return(stbi__err("bad codelengths"));
}
if (stbi__zbuild_huffman(&a->z_length, lencodes, hlit) == 0)
{
return(0);
}
if (stbi__zbuild_huffman(&a->z_distance, lencodes + hlit, hdist) == 0)
{
return(0);
}
return(1);
}
internal static float __modf(float a, float b)
{
return((float)(CRuntime.fmod((float)(a), (float)(b))));
}
public static ushort *stbi__convert_format16(ushort *data, int img_n, int req_comp, uint x, uint y)
{
var i = 0;
var j = 0;
ushort *good;
if (req_comp == img_n)
{
return(data);
}
good = (ushort *)stbi__malloc((ulong)(req_comp * x * y * 2));
if (good == null)
{
CRuntime.free(data);
return((ushort *)(byte *)(ulong)((stbi__err("outofmem") != 0) ? (byte *)null : null));
}
for (j = 0; j < (int)y; ++j)
{
var src = data + j * x * img_n;
var dest = good + j * x * req_comp;
switch (img_n * 8 + req_comp)
{
case (1 * 8 + 2):
{
for (i = (int)(x - 1); i >= 0; --i, src += 1, dest += 2)
{
dest[0] = src[0];
dest[1] = 0xffff;
}
break;
}
case (1 * 8 + 3):
{
for (i = (int)(x - 1); i >= 0; --i, src += 1, dest += 3)
{
dest[0] = dest[1] = dest[2] = src[0];
}
break;
}
case (1 * 8 + 4):
{
for (i = (int)(x - 1); i >= 0; --i, src += 1, dest += 4)
{
dest[0] = dest[1] = dest[2] = src[0];
dest[3] = 0xffff;
}
break;
}
case (2 * 8 + 1):
{
for (i = (int)(x - 1); i >= 0; --i, src += 2, dest += 1)
{
dest[0] = src[0];
}
break;
}
case (2 * 8 + 3):
{
for (i = (int)(x - 1); i >= 0; --i, src += 2, dest += 3)
{
dest[0] = dest[1] = dest[2] = src[0];
}
break;
}
case (2 * 8 + 4):
{
for (i = (int)(x - 1); i >= 0; --i, src += 2, dest += 4)
{
dest[0] = dest[1] = dest[2] = src[0];
dest[3] = src[1];
}
break;
}
case (3 * 8 + 4):
{
for (i = (int)(x - 1); i >= 0; --i, src += 3, dest += 4)
{
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
dest[3] = 0xffff;
}
break;
}
case (3 * 8 + 1):
{
for (i = (int)(x - 1); i >= 0; --i, src += 3, dest += 1)
{
dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
}
break;
}
case (3 * 8 + 2):
{
for (i = (int)(x - 1); i >= 0; --i, src += 3, dest += 2)
{
dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
dest[1] = 0xffff;
}
break;
}
case (4 * 8 + 1):
{
for (i = (int)(x - 1); i >= 0; --i, src += 4, dest += 1)
{
dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
}
break;
}
case (4 * 8 + 2):
{
for (i = (int)(x - 1); i >= 0; --i, src += 4, dest += 2)
{
dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
dest[1] = src[3];
}
break;
}
case (4 * 8 + 3):
{
for (i = (int)(x - 1); i >= 0; --i, src += 4, dest += 3)
{
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
}
break;
}
default:
{
return((ushort *)(byte *)(ulong)((stbi__err("0") != 0) ? (byte *)null : null));
}
}
}
CRuntime.free(data);
return(good);
}
public static int stbi__hdr_info(stbi__context s, int *x, int *y, int *comp)
{
var buffer = stackalloc sbyte[1024];
sbyte *token;
var valid = 0;
var dummy = 0;
if (x == null)
{
x = &dummy;
}
if (y == null)
{
y = &dummy;
}
if (comp == null)
{
comp = &dummy;
}
if (stbi__hdr_test(s) == 0)
{
stbi__rewind(s);
return(0);
}
for (; ;)
{
token = stbi__hdr_gettoken(s, buffer);
if (token[0] == 0)
{
break;
}
if (CRuntime.strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0)
{
valid = 1;
}
}
if (valid == 0)
{
stbi__rewind(s);
return(0);
}
token = stbi__hdr_gettoken(s, buffer);
if (CRuntime.strncmp(token, "-Y ", (ulong)3) != 0)
{
stbi__rewind(s);
return(0);
}
token += 3;
*y = (int)CRuntime.strtol(token, &token, 10);
while (*token == ' ')
{
++token;
}
if (CRuntime.strncmp(token, "+X ", (ulong)3) != 0)
{
stbi__rewind(s);
return(0);
}
token += 3;
*x = (int)CRuntime.strtol(token, null, 10);
*comp = 3;
return(1);
}
public static void *stbi__tga_load(stbi__context s, int *x, int *y, int *comp,
int req_comp, stbi__result_info *ri)
{
var tga_offset = (int)stbi__get8(s);
var tga_indexed = (int)stbi__get8(s);
var tga_image_type = (int)stbi__get8(s);
var tga_is_RLE = 0;
var tga_palette_start = stbi__get16le(s);
var tga_palette_len = stbi__get16le(s);
var tga_palette_bits = (int)stbi__get8(s);
var tga_x_origin = stbi__get16le(s);
var tga_y_origin = stbi__get16le(s);
var tga_width = stbi__get16le(s);
var tga_height = stbi__get16le(s);
var tga_bits_per_pixel = (int)stbi__get8(s);
var tga_comp = 0;
var tga_rgb16 = 0;
var tga_inverted = (int)stbi__get8(s);
byte *tga_data;
byte *tga_palette = null;
var i = 0;
var j = 0;
var raw_data = stackalloc byte[4];
raw_data[0] = 0;
var RLE_count = 0;
var RLE_repeating = 0;
var read_next_pixel = 1;
if (tga_image_type >= 8)
{
tga_image_type -= 8;
tga_is_RLE = 1;
}
tga_inverted = 1 - ((tga_inverted >> 5) & 1);
if (tga_indexed != 0)
{
tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
}
else
{
tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) ? 1 : 0, &tga_rgb16);
}
if (tga_comp == 0)
{
return((byte *)(ulong)((stbi__err("bad format") != 0) ? (byte *)null : null));
}
*x = tga_width;
*y = tga_height;
if (comp != null)
{
*comp = tga_comp;
}
if (stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0) == 0)
{
return((byte *)(ulong)((stbi__err("too large") != 0) ? (byte *)null : null));
}
tga_data = (byte *)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
if (tga_data == null)
{
return((byte *)(ulong)((stbi__err("outofmem") != 0) ? (byte *)null : null));
}
stbi__skip(s, tga_offset);
if ((tga_indexed == 0) && (tga_is_RLE == 0) && (tga_rgb16 == 0))
{
for (i = 0; i < tga_height; ++i)
{
var row = tga_inverted != 0 ? tga_height - i - 1 : i;
var tga_row = tga_data + row * tga_width * tga_comp;
stbi__getn(s, tga_row, tga_width * tga_comp);
}
}
else
{
if (tga_indexed != 0)
{
stbi__skip(s, tga_palette_start);
tga_palette = (byte *)stbi__malloc_mad2(tga_palette_len, tga_comp, 0);
if (tga_palette == null)
{
CRuntime.free(tga_data);
return((byte *)(ulong)((stbi__err("outofmem") != 0) ? (byte *)null : null));
}
if (tga_rgb16 != 0)
{
var pal_entry = tga_palette;
for (i = 0; i < tga_palette_len; ++i)
{
stbi__tga_read_rgb16(s, pal_entry);
pal_entry += tga_comp;
}
}
else
{
if (stbi__getn(s, tga_palette, tga_palette_len * tga_comp) == 0)
{
CRuntime.free(tga_data);
CRuntime.free(tga_palette);
return((byte *)(ulong)((stbi__err("bad palette") != 0) ? (byte *)null : null));
}
}
}
for (i = 0; i < tga_width * tga_height; ++i)
{
if (tga_is_RLE != 0)
{
if (RLE_count == 0)
{
var RLE_cmd = (int)stbi__get8(s);
RLE_count = 1 + (RLE_cmd & 127);
RLE_repeating = RLE_cmd >> 7;
read_next_pixel = 1;
}
else
{
if (RLE_repeating == 0)
{
read_next_pixel = 1;
}
}
}
else
{
read_next_pixel = 1;
}
if (read_next_pixel != 0)
{
if (tga_indexed != 0)
{
var pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
if (pal_idx >= tga_palette_len)
{
pal_idx = 0;
}
pal_idx *= tga_comp;
for (j = 0; j < tga_comp; ++j)
{
raw_data[j] = tga_palette[pal_idx + j];
}
}
else
{
if (tga_rgb16 != 0)
{
stbi__tga_read_rgb16(s, raw_data);
}
else
{
for (j = 0; j < tga_comp; ++j)
{
raw_data[j] = stbi__get8(s);
}
}
}
read_next_pixel = 0;
}
for (j = 0; j < tga_comp; ++j)
{
tga_data[i * tga_comp + j] = raw_data[j];
}
--RLE_count;
}
if (tga_inverted != 0)
{
for (j = 0; j * 2 < tga_height; ++j)
{
var index1 = j * tga_width * tga_comp;
var index2 = (tga_height - 1 - j) * tga_width * tga_comp;
for (i = tga_width * tga_comp; i > 0; --i)
{
var temp = tga_data[index1];
tga_data[index1] = tga_data[index2];
tga_data[index2] = temp;
++index1;
++index2;
}
}
}
if (tga_palette != null)
{
CRuntime.free(tga_palette);
}
}
if ((tga_comp >= 3) && (tga_rgb16 == 0))
{
var tga_pixel = tga_data;
for (i = 0; i < tga_width * tga_height; ++i)
{
var temp = tga_pixel[0];
tga_pixel[0] = tga_pixel[2];
tga_pixel[2] = temp;
tga_pixel += tga_comp;
}
}
if (req_comp != 0 && req_comp != tga_comp)
{
tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, (uint)tga_width, (uint)tga_height);
}
tga_palette_start = tga_palette_len = tga_palette_bits = tga_x_origin = tga_y_origin = 0;
return(tga_data);
}
public static void *stbi__bmp_load(stbi__context s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
{
byte *_out_;
var mr = (uint)0;
var mg = (uint)0;
var mb = (uint)0;
var ma = (uint)0;
uint all_a = 0;
var pal = stackalloc byte[256 * 4];
var psize = 0;
var i = 0;
var j = 0;
var width = 0;
var flip_vertically = 0;
var pad = 0;
var target = 0;
var info = new stbi__bmp_data();
info.all_a = 255;
if (stbi__bmp_parse_header(s, &info) == null)
{
return(null);
}
flip_vertically = ((int)s.img_y > 0) ? 1 : 0;
s.img_y = (uint)CRuntime.abs((int)s.img_y);
mr = info.mr;
mg = info.mg;
mb = info.mb;
ma = info.ma;
all_a = info.all_a;
if (info.hsz == 12)
{
if (info.bpp < 24)
{
psize = (info.offset - 14 - 24) / 3;
}
}
else
{
if (info.bpp < 16)
{
psize = (info.offset - 14 - info.hsz) >> 2;
}
}
s.img_n = (ma != 0) ? 4 : 3;
if ((req_comp != 0) && (req_comp >= 3))
{
target = req_comp;
}
else
{
target = s.img_n;
}
if (stbi__mad3sizes_valid(target, (int)s.img_x, (int)s.img_y, 0) == 0)
{
return((byte *)(ulong)((stbi__err("too large") != 0) ? (byte *)null : null));
}
_out_ = (byte *)stbi__malloc_mad3(target, (int)s.img_x, (int)s.img_y, 0);
if (_out_ == null)
{
return((byte *)(ulong)((stbi__err("outofmem") != 0) ? (byte *)null : null));
}
if (info.bpp < 16)
{
var z = 0;
if ((psize == 0) || (psize > 256))
{
CRuntime.free(_out_);
return((byte *)(ulong)((stbi__err("invalid") != 0) ? (byte *)null : null));
}
for (i = 0; i < psize; ++i)
{
pal[i * 4 + 2] = stbi__get8(s);
pal[i * 4 + 1] = stbi__get8(s);
pal[i * 4 + 0] = stbi__get8(s);
if (info.hsz != 12)
{
stbi__get8(s);
}
pal[i * 4 + 3] = 255;
}
stbi__skip(s, info.offset - 14 - info.hsz - psize * ((info.hsz == 12) ? 3 : 4));
if (info.bpp == 1)
{
width = (int)((s.img_x + 7) >> 3);
}
else
{
if (info.bpp == 4)
{
width = (int)((s.img_x + 1) >> 1);
}
else
{
if (info.bpp == 8)
{
width = (int)s.img_x;
}
else
{
CRuntime.free(_out_);
return((byte *)(ulong)((stbi__err("bad bpp") != 0) ? (byte *)null : null));
}
}
}
pad = -width & 3;
if (info.bpp == 1)
{
for (j = 0; j < (int)s.img_y; ++j)
{
var bit_offset = 7;
var v = (int)stbi__get8(s);
for (i = 0; i < (int)s.img_x; ++i)
{
var color = (v >> bit_offset) & 0x1;
_out_[z++] = pal[color * 4 + 0];
_out_[z++] = pal[color * 4 + 1];
_out_[z++] = pal[color * 4 + 2];
if (target == 4)
{
_out_[z++] = 255;
}
if ((i + 1) == (int)s.img_x)
{
break;
}
if ((--bit_offset) < 0)
{
bit_offset = 7;
v = stbi__get8(s);
}
}
stbi__skip(s, pad);
}
}
else
{
for (j = 0; j < (int)s.img_y; ++j)
{
for (i = 0; i < (int)s.img_x; i += 2)
{
var v = (int)stbi__get8(s);
var v2 = 0;
if (info.bpp == 4)
{
v2 = v & 15;
v >>= 4;
}
_out_[z++] = pal[v * 4 + 0];
_out_[z++] = pal[v * 4 + 1];
_out_[z++] = pal[v * 4 + 2];
if (target == 4)
{
_out_[z++] = 255;
}
if ((i + 1) == (int)s.img_x)
{
break;
}
v = (info.bpp == 8) ? stbi__get8(s) : v2;
_out_[z++] = pal[v * 4 + 0];
_out_[z++] = pal[v * 4 + 1];
_out_[z++] = pal[v * 4 + 2];
if (target == 4)
{
_out_[z++] = 255;
}
}
stbi__skip(s, pad);
}
}
}
else
{
var rshift = 0;
var gshift = 0;
var bshift = 0;
var ashift = 0;
var rcount = 0;
var gcount = 0;
var bcount = 0;
var acount = 0;
var z = 0;
var easy = 0;
stbi__skip(s, info.offset - 14 - info.hsz);
if (info.bpp == 24)
{
width = (int)(3 * s.img_x);
}
else
{
if (info.bpp == 16)
{
width = (int)(2 * s.img_x);
}
else
{
width = 0;
}
}
pad = -width & 3;
if (info.bpp == 24)
{
easy = 1;
}
else
{
if (info.bpp == 32)
{
if ((mb == 0xff) && (mg == 0xff00) && (mr == 0x00ff0000) && (ma == 0xff000000))
{
easy = 2;
}
}
}
if (easy == 0)
{
if ((mr == 0) || (mg == 0) || (mb == 0))
{
CRuntime.free(_out_);
return((byte *)(ulong)((stbi__err("bad masks") != 0) ? (byte *)null : null));
}
rshift = stbi__high_bit(mr) - 7;
rcount = stbi__bitcount(mr);
gshift = stbi__high_bit(mg) - 7;
gcount = stbi__bitcount(mg);
bshift = stbi__high_bit(mb) - 7;
bcount = stbi__bitcount(mb);
ashift = stbi__high_bit(ma) - 7;
acount = stbi__bitcount(ma);
}
for (j = 0; j < (int)s.img_y; ++j)
{
if (easy != 0)
{
for (i = 0; i < (int)s.img_x; ++i)
{
byte a = 0;
_out_[z + 2] = stbi__get8(s);
_out_[z + 1] = stbi__get8(s);
_out_[z + 0] = stbi__get8(s);
z += 3;
a = (byte)((easy == 2) ? stbi__get8(s) : 255);
all_a |= a;
if (target == 4)
{
_out_[z++] = a;
}
}
}
else
{
var bpp = info.bpp;
for (i = 0; i < (int)s.img_x; ++i)
{
var v = (bpp == 16) ? (uint)stbi__get16le(s) : stbi__get32le(s);
uint a = 0;
_out_[z++] = (byte)(stbi__shiftsigned(v & mr, rshift, rcount) & 255);
_out_[z++] = (byte)(stbi__shiftsigned(v & mg, gshift, gcount) & 255);
_out_[z++] = (byte)(stbi__shiftsigned(v & mb, bshift, bcount) & 255);
a = (uint)((ma != 0) ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
all_a |= a;
if (target == 4)
{
_out_[z++] = (byte)(a & 255);
}
}
}
stbi__skip(s, pad);
}
}
if ((target == 4) && (all_a == 0))
{
for (i = (int)(4 * s.img_x * s.img_y - 1); i >= 0; i -= 4)
{
_out_[i] = 255;
}
}
if (flip_vertically != 0)
{
byte t = 0;
for (j = 0; j < (int)s.img_y >> 1; ++j)
{
var p1 = _out_ + j * s.img_x * target;
var p2 = _out_ + (s.img_y - 1 - j) * s.img_x * target;
for (i = 0; i < (int)s.img_x * target; ++i)
{
t = p1[i];
p1[i] = p2[i];
p2[i] = t;
}
}
}
if ((req_comp != 0) && (req_comp != target))
{
_out_ = stbi__convert_format(_out_, target, req_comp, s.img_x, s.img_y);
if (_out_ == null)
{
return(_out_);
}
}
*x = (int)s.img_x;
*y = (int)s.img_y;
if (comp != null)
{
*comp = s.img_n;
}
return(_out_);
}
private static void *stbi__malloc(int size)
{
return(CRuntime.malloc((ulong)size));
}
public static byte *stbi__gif_load_next(StbiContext s, StbiGif g, int *comp, int reqComp, byte *twoBack)
{
var dispose = 0;
var first_frame = 0;
var pi = 0;
var pcount = 0;
first_frame = 0;
if (g.Out == null)
{
if (stbi__gif_header(s, g, comp, 0) == 0)
{
return(null);
}
if (stbi__mad3sizes_valid(4, g.W, g.H, 0) == 0)
{
return((byte *)(ulong)(stbi__err("too large") != 0 ? (byte *)null : null));
}
pcount = g.W * g.H;
g.Out = (byte *)stbi__malloc((ulong)(4 * pcount));
g.Background = (byte *)stbi__malloc((ulong)(4 * pcount));
g.History = (byte *)stbi__malloc((ulong)pcount);
if (g.Out == null || g.Background == null || g.History == null)
{
return((byte *)(ulong)(stbi__err("outofmem") != 0 ? (byte *)null : null));
}
CRuntime.Memset(g.Out, 0x00, (ulong)(4 * pcount));
CRuntime.Memset(g.Background, 0x00, (ulong)(4 * pcount));
CRuntime.Memset(g.History, 0x00, (ulong)pcount);
first_frame = 1;
}
else
{
dispose = (g.Eflags & 0x1C) >> 2;
pcount = g.W * g.H;
if (dispose == 3 && twoBack == null)
{
dispose = 2;
}
if (dispose == 3)
{
for (pi = 0; pi < pcount; ++pi)
{
if (g.History[pi] != 0)
{
CRuntime.Memcpy(&g.Out[pi * 4], &twoBack[pi * 4], (ulong)4);
}
}
}
else if (dispose == 2)
{
for (pi = 0; pi < pcount; ++pi)
{
if (g.History[pi] != 0)
{
CRuntime.Memcpy(&g.Out[pi * 4], &g.Background[pi * 4], (ulong)4);
}
}
}
CRuntime.Memcpy(g.Background, g.Out, (ulong)(4 * g.W * g.H));
}
CRuntime.Memset(g.History, 0x00, (ulong)(g.W * g.H));
for (; ;)
{
var tag = (int)stbi__get8(s);
switch (tag)
{
case 0x2C:
{
var x = 0;
var y = 0;
var w = 0;
var h = 0;
byte *o;
x = stbi__get16le(s);
y = stbi__get16le(s);
w = stbi__get16le(s);
h = stbi__get16le(s);
if (x + w > g.W || y + h > g.H)
{
return((byte *)(ulong)(stbi__err("bad Image Descriptor") != 0 ? (byte *)null : null));
}
g.LineSize = g.W * 4;
g.StartX = x * 4;
g.StartY = y * g.LineSize;
g.MaxX = g.StartX + w * 4;
g.MaxY = g.StartY + h * g.LineSize;
g.CurX = g.StartX;
g.CurY = g.StartY;
if (w == 0)
{
g.CurY = g.MaxY;
}
g.Lflags = stbi__get8(s);
if ((g.Lflags & 0x40) != 0)
{
g.Step = 8 * g.LineSize;
g.Parse = 3;
}
else
{
g.Step = g.LineSize;
g.Parse = 0;
}
if ((g.Lflags & 0x80) != 0)
{
stbi__gif_parse_colortable(s, g.Lpal, 2 << (g.Lflags & 7),
(g.Eflags & 0x01) != 0 ? g.Transparent : -1);
g.ColorTable = g.Lpal;
}
else if ((g.Flags & 0x80) != 0)
{
g.ColorTable = g.Pal;
}
else
{
return((byte *)(ulong)(stbi__err("missing color table") != 0 ? (byte *)null : null));
}
o = stbi__process_gif_raster(s, g);
if (o == null)
{
return(null);
}
pcount = g.W * g.H;
if (first_frame != 0 && g.Bgindex > 0)
{
for (pi = 0; pi < pcount; ++pi)
{
if (g.History[pi] == 0)
{
g.Pal[g.Bgindex * 4 + 3] = 255;
CRuntime.Memcpy(&g.Out[pi * 4], &g.Pal[g.Bgindex], (ulong)4);
}
}
}
return(o);
}
case 0x21:
{
var len = 0;
var ext = (int)stbi__get8(s);
if (ext == 0xF9)
{
len = stbi__get8(s);
if (len == 4)
{
g.Eflags = stbi__get8(s);
g.Delay = 10 * stbi__get16le(s);
if (g.Transparent >= 0)
{
g.Pal[g.Transparent * 4 + 3] = 255;
}
if ((g.Eflags & 0x01) != 0)
{
g.Transparent = stbi__get8(s);
if (g.Transparent >= 0)
{
g.Pal[g.Transparent * 4 + 3] = 0;
}
}
else
{
stbi__skip(s, 1);
g.Transparent = -1;
}
}
else
{
stbi__skip(s, len);
break;
}
}
while ((len = stbi__get8(s)) != 0)
{
stbi__skip(s, len);
}
break;
}
case 0x3B:
return(null);
default:
return((byte *)(ulong)(stbi__err("unknown code") != 0 ? (byte *)null : null));
}
}
}
){kind=link}