forked from FFmpeg/FFmpeg
dddf536d3d
The underlying color mapping logic was ported as straightforwardly as possible from libplacebo, although the API and glue code has been very heavily refactored / rewritten. In particular, the generalization of gamut mapping methods is replaced by a single ICC intent selection, and constants have been hard-coded. To minimize the amount of overall operations, this gamut mapping LUT now embeds a direct end-to-end transformation to the output color space; something that libplacebo does in shaders, but which is prohibitively expensive in software. In order to preserve compatibility with dynamic tone mapping without severely regressing performance, we add the ability to generate a pair of "split" LUTS, one for encoding the input and output to the perceptual color space, and a third to embed the tone mapping operation. Additionally, this intermediate space could be used for additional subjective effect (e.g. changing saturation or brightness). The big downside of the new approach is that generating a static color mapping LUT is now fairly slow, as the chromaticity lobe peaks have to be recomputed for every single RGB value, since correlated RGB colors are not necessarily aligned in ICh space. Generating a split 3DLUT significantly alleviates this problem because the expensive step is done as part of the IPT input LUT, which can share the same hue peak calculation at least for all input intensities. |
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| .. | ||
| aarch64 | ||
| arm | ||
| loongarch | ||
| ppc | ||
| riscv | ||
| tests | ||
| x86 | ||
| alphablend.c | ||
| bayer_template.c | ||
| cms.c | ||
| cms.h | ||
| csputils.c | ||
| csputils.h | ||
| gamma.c | ||
| graph.c | ||
| graph.h | ||
| half2float.c | ||
| hscale.c | ||
| hscale_fast_bilinear.c | ||
| input.c | ||
| libswscale.v | ||
| log2_tab.c | ||
| Makefile | ||
| options.c | ||
| output.c | ||
| rgb2rgb.c | ||
| rgb2rgb.h | ||
| rgb2rgb_template.c | ||
| slice.c | ||
| swscale.c | ||
| swscale.h | ||
| swscale_internal.h | ||
| swscale_unscaled.c | ||
| swscaleres.rc | ||
| utils.c | ||
| utils.h | ||
| version.c | ||
| version.h | ||
| version_major.h | ||
| vscale.c | ||
| yuv2rgb.c | ||