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Diffstat (limited to '')
| -rw-r--r-- | third_party/jpeg-xl/lib/jxl/blending.cc | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/blending.cc b/third_party/jpeg-xl/lib/jxl/blending.cc new file mode 100644 index 0000000000..ab37fdabb5 --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/blending.cc @@ -0,0 +1,152 @@ +// Copyright (c) the JPEG XL Project Authors. All rights reserved. +// +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include "lib/jxl/blending.h" + +#include "lib/jxl/alpha.h" +#include "lib/jxl/image_ops.h" + +namespace jxl { + +bool NeedsBlending(PassesDecoderState* dec_state) { + const PassesSharedState& state = *dec_state->shared; + if (!(state.frame_header.frame_type == FrameType::kRegularFrame || + state.frame_header.frame_type == FrameType::kSkipProgressive)) { + return false; + } + const auto& info = state.frame_header.blending_info; + bool replace_all = (info.mode == BlendMode::kReplace); + for (const auto& ec_i : state.frame_header.extra_channel_blending_info) { + if (ec_i.mode != BlendMode::kReplace) { + replace_all = false; + } + } + // Replace the full frame: nothing to do. + if (!state.frame_header.custom_size_or_origin && replace_all) { + return false; + } + return true; +} + +void PerformBlending(const float* const* bg, const float* const* fg, + float* const* out, size_t x0, size_t xsize, + const PatchBlending& color_blending, + const PatchBlending* ec_blending, + const std::vector<ExtraChannelInfo>& extra_channel_info) { + bool has_alpha = false; + size_t num_ec = extra_channel_info.size(); + for (size_t i = 0; i < num_ec; i++) { + if (extra_channel_info[i].type == jxl::ExtraChannel::kAlpha) { + has_alpha = true; + break; + } + } + ImageF tmp(xsize, 3 + num_ec); + // Blend extra channels first so that we use the pre-blending alpha. + for (size_t i = 0; i < num_ec; i++) { + if (ec_blending[i].mode == PatchBlendMode::kAdd) { + for (size_t x = 0; x < xsize; x++) { + tmp.Row(3 + i)[x] = bg[3 + i][x + x0] + fg[3 + i][x + x0]; + } + } else if (ec_blending[i].mode == PatchBlendMode::kBlendAbove) { + size_t alpha = ec_blending[i].alpha_channel; + bool is_premultiplied = extra_channel_info[alpha].alpha_associated; + PerformAlphaBlending(bg[3 + i] + x0, bg[3 + alpha] + x0, fg[3 + i] + x0, + fg[3 + alpha] + x0, tmp.Row(3 + i), xsize, + is_premultiplied, ec_blending[i].clamp); + } else if (ec_blending[i].mode == PatchBlendMode::kBlendBelow) { + size_t alpha = ec_blending[i].alpha_channel; + bool is_premultiplied = extra_channel_info[alpha].alpha_associated; + PerformAlphaBlending(fg[3 + i] + x0, fg[3 + alpha] + x0, bg[3 + i] + x0, + bg[3 + alpha] + x0, tmp.Row(3 + i), xsize, + is_premultiplied, ec_blending[i].clamp); + } else if (ec_blending[i].mode == PatchBlendMode::kAlphaWeightedAddAbove) { + size_t alpha = ec_blending[i].alpha_channel; + PerformAlphaWeightedAdd(bg[3 + i] + x0, fg[3 + i] + x0, + fg[3 + alpha] + x0, tmp.Row(3 + i), xsize, + ec_blending[i].clamp); + } else if (ec_blending[i].mode == PatchBlendMode::kAlphaWeightedAddBelow) { + size_t alpha = ec_blending[i].alpha_channel; + PerformAlphaWeightedAdd(fg[3 + i] + x0, bg[3 + i] + x0, + bg[3 + alpha] + x0, tmp.Row(3 + i), xsize, + ec_blending[i].clamp); + } else if (ec_blending[i].mode == PatchBlendMode::kMul) { + PerformMulBlending(bg[3 + i] + x0, fg[3 + i] + x0, tmp.Row(3 + i), xsize, + ec_blending[i].clamp); + } else if (ec_blending[i].mode == PatchBlendMode::kReplace) { + memcpy(tmp.Row(3 + i), fg[3 + i] + x0, xsize * sizeof(**fg)); + } else if (ec_blending[i].mode == PatchBlendMode::kNone) { + if (xsize) memcpy(tmp.Row(3 + i), bg[3 + i] + x0, xsize * sizeof(**fg)); + } else { + JXL_ABORT("Unreachable"); + } + } + size_t alpha = color_blending.alpha_channel; + + if (color_blending.mode == PatchBlendMode::kAdd || + (color_blending.mode == PatchBlendMode::kAlphaWeightedAddAbove && + !has_alpha) || + (color_blending.mode == PatchBlendMode::kAlphaWeightedAddBelow && + !has_alpha)) { + for (int p = 0; p < 3; p++) { + float* out = tmp.Row(p); + for (size_t x = 0; x < xsize; x++) { + out[x] = bg[p][x + x0] + fg[p][x + x0]; + } + } + } else if (color_blending.mode == PatchBlendMode::kBlendAbove + // blend without alpha is just replace + && has_alpha) { + bool is_premultiplied = extra_channel_info[alpha].alpha_associated; + PerformAlphaBlending( + {bg[0] + x0, bg[1] + x0, bg[2] + x0, bg[3 + alpha] + x0}, + {fg[0] + x0, fg[1] + x0, fg[2] + x0, fg[3 + alpha] + x0}, + {tmp.Row(0), tmp.Row(1), tmp.Row(2), tmp.Row(3 + alpha)}, xsize, + is_premultiplied, color_blending.clamp); + } else if (color_blending.mode == PatchBlendMode::kBlendBelow + // blend without alpha is just replace + && has_alpha) { + bool is_premultiplied = extra_channel_info[alpha].alpha_associated; + PerformAlphaBlending( + {fg[0] + x0, fg[1] + x0, fg[2] + x0, fg[3 + alpha] + x0}, + {bg[0] + x0, bg[1] + x0, bg[2] + x0, bg[3 + alpha] + x0}, + {tmp.Row(0), tmp.Row(1), tmp.Row(2), tmp.Row(3 + alpha)}, xsize, + is_premultiplied, color_blending.clamp); + } else if (color_blending.mode == PatchBlendMode::kAlphaWeightedAddAbove) { + JXL_DASSERT(has_alpha); + for (size_t c = 0; c < 3; c++) { + PerformAlphaWeightedAdd(bg[c] + x0, fg[c] + x0, fg[3 + alpha] + x0, + tmp.Row(c), xsize, color_blending.clamp); + } + } else if (color_blending.mode == PatchBlendMode::kAlphaWeightedAddBelow) { + JXL_DASSERT(has_alpha); + for (size_t c = 0; c < 3; c++) { + PerformAlphaWeightedAdd(fg[c] + x0, bg[c] + x0, bg[3 + alpha] + x0, + tmp.Row(c), xsize, color_blending.clamp); + } + } else if (color_blending.mode == PatchBlendMode::kMul) { + for (int p = 0; p < 3; p++) { + PerformMulBlending(bg[p] + x0, fg[p] + x0, tmp.Row(p), xsize, + color_blending.clamp); + } + } else if (color_blending.mode == PatchBlendMode::kReplace || + color_blending.mode == PatchBlendMode::kBlendAbove || + color_blending.mode == PatchBlendMode::kBlendBelow) { // kReplace + for (size_t p = 0; p < 3; p++) { + memcpy(tmp.Row(p), fg[p] + x0, xsize * sizeof(**fg)); + } + } else if (color_blending.mode == PatchBlendMode::kNone) { + for (size_t p = 0; p < 3; p++) { + memcpy(tmp.Row(p), bg[p] + x0, xsize * sizeof(**fg)); + } + } else { + JXL_ABORT("Unreachable"); + } + for (size_t i = 0; i < 3 + num_ec; i++) { + if (xsize != 0) memcpy(out[i] + x0, tmp.Row(i), xsize * sizeof(**out)); + } +} + +} // namespace jxl |