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Clamp values when converting from higher-bit precission to lower.

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This commit is contained in:
Branimir Karadžić
2017-06-27 17:41:38 -07:00
parent 9031242773
commit 72428407f8
1 changed files with 11 additions and 43 deletions
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54
src/image_encode.cpp
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@@ -141,30 +141,11 @@ namespace bimg
const uint8_t* src = (const uint8_t*)_src;
switch (_dstFormat)
if (!imageConvert(_dst, _dstFormat, _src, TextureFormat::RGBA32F, _width, _height) )
{
case TextureFormat::RGBA8:
uint8_t* temp = (uint8_t*)BX_ALLOC(_allocator, _width*_height*4);
if (imageConvert(temp, TextureFormat::RGBA8, _src, TextureFormat::RGBA32F, _width, _height) )
{
uint8_t* dst = (uint8_t*)_dst;
for (uint32_t yy = 0; yy < _height; ++yy)
{
for (uint32_t xx = 0; xx < _width; ++xx)
{
const uint32_t offset = yy*_width + xx;
const float* input = (const float*)&src[offset * 16];
uint8_t* output = &dst[offset * 4];
output[0] = uint8_t(input[0]*255.0f + 0.5f);
output[1] = uint8_t(input[1]*255.0f + 0.5f);
output[2] = uint8_t(input[2]*255.0f + 0.5f);
output[3] = uint8_t(input[3]*255.0f + 0.5f);
}
}
}
break;
case TextureFormat::BC5:
{
uint8_t* temp = (uint8_t*)BX_ALLOC(_allocator, _width*_height*4);
for (uint32_t yy = 0; yy < _height; ++yy)
{
for (uint32_t xx = 0; xx < _width; ++xx)
@@ -172,33 +153,20 @@ namespace bimg
const uint32_t offset = yy*_width + xx;
const float* input = (const float*)&src[offset * 16];
uint8_t* output = &temp[offset * 4];
output[0] = uint8_t(input[0]*255.0f + 0.5f);
output[1] = uint8_t(input[1]*255.0f + 0.5f);
output[2] = uint8_t(input[2]*255.0f + 0.5f);
output[3] = uint8_t(input[3]*255.0f + 0.5f);
output[0] = uint8_t(bx::fsaturate(input[0])*255.0f + 0.5f);
output[1] = uint8_t(bx::fsaturate(input[1])*255.0f + 0.5f);
output[2] = uint8_t(bx::fsaturate(input[2])*255.0f + 0.5f);
output[3] = uint8_t(bx::fsaturate(input[3])*255.0f + 0.5f);
}
}
imageEncodeFromRgba8(_dst, temp, _width, _height, _dstFormat, _quality);
BX_FREE(_allocator, temp);
imageEncodeFromRgba8(_dst, temp, _width, _height, _dstFormat, _quality, _err);
}
break;
default:
if (!imageConvert(_dst, _dstFormat, _src, TextureFormat::RGBA32F, _width, _height) )
else
{
uint8_t* temp = (uint8_t*)BX_ALLOC(_allocator, _width*_height*4);
if (imageConvert(temp, TextureFormat::RGBA8, _src, TextureFormat::RGBA32F, _width, _height) )
{
imageEncodeFromRgba8(_dst, temp, _width, _height, _dstFormat, _quality, _err);
}
else
{
BX_ERROR_SET(_err, BIMG_ERROR, "Unable to convert between input/output formats!");
}
BX_FREE(_allocator, temp);
BX_ERROR_SET(_err, BIMG_ERROR, "Unable to convert between input/output formats!");
}
break;
BX_FREE(_allocator, temp);
}
}