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PNG: Fixed 1,2,4 bits palette support

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This commit is contained in:
C.Even
2021-04-18 20:02:59 +08:00
parent f0ba7cb88c
commit 2be26090ca
1 changed files with 48 additions and 15 deletions
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63
src/image_decode.cpp
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@@ -110,8 +110,8 @@ namespace bimg
case 1:
case 2:
case 4:
format = bimg::TextureFormat::R8;
palette = false;
palette = LCT_PALETTE == state.info_raw.colortype;
format = palette ? bimg::TextureFormat::RGBA8 : bimg::TextureFormat::R8;
supported = true;
break;
@@ -215,7 +215,10 @@ namespace bimg
const uint8_t* copyData = data;
TextureFormat::Enum dstFormat = format;
if (1 == state.info_raw.bitdepth
if (palette) {
copyData = NULL;
}
else if (1 == state.info_raw.bitdepth
|| 2 == state.info_raw.bitdepth
|| 4 == state.info_raw.bitdepth)
{
@@ -227,10 +230,6 @@ namespace bimg
dstFormat = bimg::TextureFormat::RGBA16;
copyData = NULL;
}
else if (palette)
{
copyData = NULL;
}
output = imageAlloc(_allocator
, dstFormat
@@ -243,7 +242,48 @@ namespace bimg
, copyData
);
if (1 == state.info_raw.bitdepth)
if (palette)
{
if (1 == state.info_raw.bitdepth) {
for (uint32_t ii = 0, num = width*height/8; ii < num; ++ii)
{
uint8_t* dst = (uint8_t*)output->m_data + ii*32;
bx::memCopy(dst, state.info_raw.palette + ( (data[ii]>>7)&0x1)*4, 4);
bx::memCopy(dst + 4, state.info_raw.palette + ( (data[ii]>>6)&0x1)*4, 4);
bx::memCopy(dst + 8, state.info_raw.palette + ( (data[ii]>>5)&0x1)*4, 4);
bx::memCopy(dst + 12, state.info_raw.palette + ( (data[ii]>>4)&0x1)*4, 4);
bx::memCopy(dst + 16, state.info_raw.palette + ( (data[ii]>>3)&0x1)*4, 4);
bx::memCopy(dst + 20, state.info_raw.palette + ( (data[ii]>>2)&0x1)*4, 4);
bx::memCopy(dst + 24, state.info_raw.palette + ( (data[ii]>>1)&0x1)*4, 4);
bx::memCopy(dst + 28, state.info_raw.palette + ( data[ii] &0x1)*4, 4);
}
}
else if (2 == state.info_raw.bitdepth) {
for (uint32_t ii = 0, num = width*height/4; ii < num; ++ii)
{
uint8_t* dst = (uint8_t*)output->m_data + ii*16;
bx::memCopy(dst, state.info_raw.palette + ( (data[ii]>>6)&0x3)*4, 4);
bx::memCopy(dst + 4, state.info_raw.palette + ( (data[ii]>>4)&0x3)*4, 4);
bx::memCopy(dst + 8, state.info_raw.palette + ( (data[ii]>>2)&0x3)*4, 4);
bx::memCopy(dst + 12, state.info_raw.palette + ( data[ii] &0x3)*4, 4);
}
}
else if (4 == state.info_raw.bitdepth) {
for (uint32_t ii = 0, num = width*height/2; ii < num; ++ii)
{
uint8_t* dst = (uint8_t*)output->m_data + ii*8;
bx::memCopy(dst, state.info_raw.palette + ( (data[ii]>>4)&0xf)*4, 4);
bx::memCopy(dst + 4, state.info_raw.palette + ( data[ii] &0xf)*4, 4);
}
}
else {
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);
}
}
}
else if (1 == state.info_raw.bitdepth)
{
for (uint32_t ii = 0, num = width*height/8; ii < num; ++ii)
{
@@ -305,13 +345,6 @@ namespace bimg
dst[3] = UINT16_MAX;
}
}
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);
}
}
switch (state.info_raw.colortype) //Check for alpha values
{