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Added support for palettized and 1-bit .png files.

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This commit is contained in:
Branimir Karadžić
2017-04-21 18:20:28 -07:00
parent b0bdc18c27
commit 8c79e05df0
2 changed files with 60 additions and 13 deletions
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66
src/image_decode.cpp
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@@ -91,28 +91,44 @@ namespace bimg
if (0 == error)
{
bool palette = false;
bool supported = false;
switch (state.info_raw.bitdepth)
{
case 1:
format = bimg::TextureFormat::R1;
palette = true;
supported = true;
break;
case 8:
switch (state.info_raw.colortype)
{
case LCT_GREY:
format = bimg::TextureFormat::R8;
supported = true;
break;
case LCT_GREY_ALPHA:
format = bimg::TextureFormat::RG8;
supported = true;
break;
case LCT_RGB:
format = bimg::TextureFormat::RGB8;
supported = true;
break;
case LCT_RGBA:
format = bimg::TextureFormat::RGBA8;
supported = true;
break;
case LCT_PALETTE:
format = bimg::TextureFormat::RGBA8;
palette = true;
supported = true;
break;
}
break;
@@ -127,6 +143,7 @@ namespace bimg
rgba[0] = bx::toHostEndian(rgba[0], false);
}
format = bimg::TextureFormat::R16;
supported = true;
break;
case LCT_GREY_ALPHA:
@@ -137,6 +154,7 @@ namespace bimg
rgba[1] = bx::toHostEndian(rgba[1], false);
}
format = bimg::TextureFormat::RG16;
supported = true;
break;
case LCT_RGBA:
@@ -149,6 +167,7 @@ namespace bimg
rgba[3] = bx::toHostEndian(rgba[3], false);
}
format = bimg::TextureFormat::RGBA16;
supported = true;
break;
case LCT_RGB:
@@ -161,16 +180,43 @@ namespace bimg
break;
}
output = imageAlloc(_allocator
, format
, uint16_t(width)
, uint16_t(height)
, 0
, 1
, false
, false
, data
);
if (supported)
{
output = imageAlloc(_allocator
, bimg::TextureFormat::R1 == format ? bimg::TextureFormat::R8 : format
, uint16_t(width)
, uint16_t(height)
, 0
, 1
, false
, false
, palette ? NULL : data
);
if (bimg::TextureFormat::R1 == format)
{
for (uint32_t ii = 0, num = width*height/8; ii < num; ++ii)
{
uint8_t value = data[ii];
uint8_t* dst = (uint8_t*)output->m_data + ii * 8;
dst[0] = value & 0x01 ? 255 : 0;
dst[1] = value & 0x02 ? 255 : 0;
dst[2] = value & 0x04 ? 255 : 0;
dst[3] = value & 0x08 ? 255 : 0;
dst[4] = value & 0x10 ? 255 : 0;
dst[5] = value & 0x20 ? 255 : 0;
dst[6] = value & 0x40 ? 255 : 0;
dst[7] = value & 0x80 ? 255 : 0;
}
}
else if (palette)
{
for (uint32_t ii = 0, num = width*height; ii < num; ++ii)
{
bx::memCopy( (uint8_t*)output->m_data + ii*4, state.info_raw.palette + data[ii]*4, 4);
}
}
}
}
lodepng_state_cleanup(&state);