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// 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/extras/dec/color_hints.h"
#include <jxl/encode.h>
#include "lib/extras/dec/color_description.h"
#include "lib/jxl/base/file_io.h"
namespace jxl {
namespace extras {
Status ApplyColorHints(const ColorHints& color_hints,
const bool color_already_set, const bool is_gray,
PackedPixelFile* ppf) {
if (color_already_set) {
return color_hints.Foreach(
[](const std::string& key, const std::string& /*value*/) {
JXL_WARNING("Decoder ignoring %s hint", key.c_str());
return true;
});
}
bool got_color_space = false;
JXL_RETURN_IF_ERROR(color_hints.Foreach(
[is_gray, ppf, &got_color_space](const std::string& key,
const std::string& value) -> Status {
if (key == "color_space") {
JxlColorEncoding c_original_external;
if (!ParseDescription(value, &c_original_external)) {
return JXL_FAILURE("Failed to apply color_space");
}
ppf->color_encoding = c_original_external;
if (is_gray !=
(ppf->color_encoding.color_space == JXL_COLOR_SPACE_GRAY)) {
return JXL_FAILURE("mismatch between file and color_space hint");
}
got_color_space = true;
} else if (key == "icc_pathname") {
JXL_RETURN_IF_ERROR(ReadFile(value, &ppf->icc));
got_color_space = true;
} else {
JXL_WARNING("Ignoring %s hint", key.c_str());
}
return true;
}));
if (!got_color_space) {
ppf->color_encoding.color_space =
is_gray ? JXL_COLOR_SPACE_GRAY : JXL_COLOR_SPACE_RGB;
ppf->color_encoding.white_point = JXL_WHITE_POINT_D65;
ppf->color_encoding.primaries = JXL_PRIMARIES_SRGB;
ppf->color_encoding.transfer_function = JXL_TRANSFER_FUNCTION_SRGB;
}
return true;
}
} // namespace extras
} // namespace jxl
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