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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 "plugins/gimp/file-jxl-save.h"
#include <jxl/encode.h>
#include <jxl/encode_cxx.h>
#include <jxl/types.h>
#include <cmath>
#include <utility>
#include "gobject/gsignal.h"
#define PLUG_IN_BINARY "file-jxl"
#define SAVE_PROC "file-jxl-save"
namespace jxl {
namespace {
constexpr size_t kScaleWidth = 200;
#ifndef g_clear_signal_handler
// g_clear_signal_handler was added in glib 2.62
void g_clear_signal_handler(gulong* handler, gpointer instance) {
if (handler != nullptr && *handler != 0) {
g_signal_handler_disconnect(instance, *handler);
*handler = 0;
}
}
#endif // g_clear_signal_handler
class JpegXlSaveOpts {
public:
float distance;
float quality;
bool lossless = false;
bool is_linear = false;
bool has_alpha = false;
bool is_gray = false;
bool icc_attached = false;
bool advanced_mode = false;
bool use_container = true;
bool save_exif = false;
int encoding_effort = 7;
int faster_decoding = 0;
std::string babl_format_str = "RGB u16";
std::string babl_type_str = "u16";
std::string babl_model_str = "RGB";
JxlPixelFormat pixel_format;
JxlBasicInfo basic_info;
// functions
JpegXlSaveOpts();
bool SetDistance(float dist);
bool SetQuality(float qual);
bool SetDimensions(int x, int y);
bool SetNumChannels(int channels);
bool UpdateDistance();
bool UpdateQuality();
bool SetModel(bool is_linear_);
bool UpdateBablFormat();
bool SetBablModel(std::string model);
bool SetBablType(std::string type);
bool SetPrecision(int gimp_precision);
private:
}; // class JpegXlSaveOpts
JpegXlSaveOpts jxl_save_opts;
class JpegXlSaveGui {
public:
bool SaveDialog();
private:
GtkWidget* toggle_lossless = nullptr;
GtkAdjustment* entry_distance = nullptr;
GtkAdjustment* entry_quality = nullptr;
GtkAdjustment* entry_effort = nullptr;
GtkAdjustment* entry_faster = nullptr;
GtkWidget* frame_advanced = nullptr;
GtkWidget* toggle_no_xyb = nullptr;
GtkWidget* toggle_raw = nullptr;
gulong handle_toggle_lossless = 0;
gulong handle_entry_quality = 0;
gulong handle_entry_distance = 0;
static bool GuiOnChangeQuality(GtkAdjustment* adj_qual, void* this_pointer);
static bool GuiOnChangeDistance(GtkAdjustment* adj_dist, void* this_pointer);
static bool GuiOnChangeEffort(GtkAdjustment* adj_effort);
static bool GuiOnChangeLossless(GtkWidget* toggle, void* this_pointer);
static bool GuiOnChangeCodestream(GtkWidget* toggle);
static bool GuiOnChangeNoXYB(GtkWidget* toggle);
static bool GuiOnChangeAdvancedMode(GtkWidget* toggle, void* this_pointer);
}; // class JpegXlSaveGui
JpegXlSaveGui jxl_save_gui;
bool JpegXlSaveGui::GuiOnChangeQuality(GtkAdjustment* adj_qual,
void* this_pointer) {
JpegXlSaveGui* self = static_cast<JpegXlSaveGui*>(this_pointer);
g_clear_signal_handler(&self->handle_entry_distance, self->entry_distance);
g_clear_signal_handler(&self->handle_entry_quality, self->entry_quality);
g_clear_signal_handler(&self->handle_toggle_lossless, self->toggle_lossless);
GtkAdjustment* adj_dist = self->entry_distance;
jxl_save_opts.SetQuality(gtk_adjustment_get_value(adj_qual));
gtk_adjustment_set_value(adj_dist, jxl_save_opts.distance);
self->handle_toggle_lossless = g_signal_connect(
self->toggle_lossless, "toggled", G_CALLBACK(GuiOnChangeLossless), self);
self->handle_entry_distance =
g_signal_connect(self->entry_distance, "value-changed",
G_CALLBACK(GuiOnChangeDistance), self);
self->handle_entry_quality =
g_signal_connect(self->entry_quality, "value-changed",
G_CALLBACK(GuiOnChangeQuality), self);
return true;
}
bool JpegXlSaveGui::GuiOnChangeDistance(GtkAdjustment* adj_dist,
void* this_pointer) {
JpegXlSaveGui* self = static_cast<JpegXlSaveGui*>(this_pointer);
GtkAdjustment* adj_qual = self->entry_quality;
g_clear_signal_handler(&self->handle_entry_distance, self->entry_distance);
g_clear_signal_handler(&self->handle_entry_quality, self->entry_quality);
g_clear_signal_handler(&self->handle_toggle_lossless, self->toggle_lossless);
jxl_save_opts.SetDistance(gtk_adjustment_get_value(adj_dist));
gtk_adjustment_set_value(adj_qual, jxl_save_opts.quality);
if (!(jxl_save_opts.distance < 0.001)) {
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->toggle_lossless),
false);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->toggle_no_xyb), false);
}
self->handle_toggle_lossless = g_signal_connect(
self->toggle_lossless, "toggled", G_CALLBACK(GuiOnChangeLossless), self);
self->handle_entry_distance =
g_signal_connect(self->entry_distance, "value-changed",
G_CALLBACK(GuiOnChangeDistance), self);
self->handle_entry_quality =
g_signal_connect(self->entry_quality, "value-changed",
G_CALLBACK(GuiOnChangeQuality), self);
return true;
}
bool JpegXlSaveGui::GuiOnChangeEffort(GtkAdjustment* adj_effort) {
float new_effort = 10 - gtk_adjustment_get_value(adj_effort);
jxl_save_opts.encoding_effort = new_effort;
return true;
}
bool JpegXlSaveGui::GuiOnChangeLossless(GtkWidget* toggle, void* this_pointer) {
JpegXlSaveGui* self = static_cast<JpegXlSaveGui*>(this_pointer);
GtkAdjustment* adj_distance = self->entry_distance;
GtkAdjustment* adj_quality = self->entry_quality;
GtkAdjustment* adj_effort = self->entry_effort;
jxl_save_opts.lossless =
gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(toggle));
g_clear_signal_handler(&self->handle_entry_distance, self->entry_distance);
g_clear_signal_handler(&self->handle_entry_quality, self->entry_quality);
g_clear_signal_handler(&self->handle_toggle_lossless, self->toggle_lossless);
if (jxl_save_opts.lossless) {
gtk_adjustment_set_value(adj_quality, 100.0);
gtk_adjustment_set_value(adj_distance, 0.0);
jxl_save_opts.distance = 0;
jxl_save_opts.UpdateQuality();
gtk_adjustment_set_value(adj_effort, 7);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->toggle_no_xyb), true);
} else {
gtk_adjustment_set_value(adj_quality, 90.0);
gtk_adjustment_set_value(adj_distance, 1.0);
jxl_save_opts.distance = 1.0;
jxl_save_opts.UpdateQuality();
gtk_adjustment_set_value(adj_effort, 3);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->toggle_no_xyb), false);
}
self->handle_toggle_lossless = g_signal_connect(
self->toggle_lossless, "toggled", G_CALLBACK(GuiOnChangeLossless), self);
self->handle_entry_distance =
g_signal_connect(self->entry_distance, "value-changed",
G_CALLBACK(GuiOnChangeDistance), self);
self->handle_entry_quality =
g_signal_connect(self->entry_quality, "value-changed",
G_CALLBACK(GuiOnChangeQuality), self);
return true;
}
bool JpegXlSaveGui::GuiOnChangeCodestream(GtkWidget* toggle) {
jxl_save_opts.use_container =
!gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(toggle));
return true;
}
bool JpegXlSaveGui::GuiOnChangeNoXYB(GtkWidget* toggle) {
jxl_save_opts.basic_info.uses_original_profile =
gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(toggle));
return true;
}
bool JpegXlSaveGui::GuiOnChangeAdvancedMode(GtkWidget* toggle,
void* this_pointer) {
JpegXlSaveGui* self = static_cast<JpegXlSaveGui*>(this_pointer);
jxl_save_opts.advanced_mode =
gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(toggle));
gtk_widget_set_sensitive(self->frame_advanced, jxl_save_opts.advanced_mode);
if (!jxl_save_opts.advanced_mode) {
jxl_save_opts.basic_info.uses_original_profile = JXL_FALSE;
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->toggle_no_xyb), false);
jxl_save_opts.use_container = true;
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(self->toggle_raw), false);
jxl_save_opts.faster_decoding = 0;
gtk_adjustment_set_value(GTK_ADJUSTMENT(self->entry_faster), 0);
}
return true;
}
bool JpegXlSaveGui::SaveDialog() {
gboolean run;
GtkWidget* dialog;
GtkWidget* content_area;
GtkWidget* main_vbox;
GtkWidget* frame;
GtkWidget* toggle;
GtkWidget* table;
GtkWidget* vbox;
GtkWidget* separator;
// initialize export dialog
gimp_ui_init(PLUG_IN_BINARY, true);
dialog = gimp_export_dialog_new("JPEG XL", PLUG_IN_BINARY, SAVE_PROC);
gtk_window_set_resizable(GTK_WINDOW(dialog), false);
content_area = gimp_export_dialog_get_content_area(dialog);
main_vbox = gtk_vbox_new(false, 6);
gtk_container_set_border_width(GTK_CONTAINER(main_vbox), 6);
gtk_box_pack_start(GTK_BOX(content_area), main_vbox, true, true, 0);
gtk_widget_show(main_vbox);
// Standard Settings Frame
frame = gtk_frame_new(nullptr);
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start(GTK_BOX(main_vbox), frame, false, false, 0);
gtk_widget_show(frame);
vbox = gtk_vbox_new(false, 6);
gtk_container_set_border_width(GTK_CONTAINER(vbox), 6);
gtk_container_add(GTK_CONTAINER(frame), vbox);
gtk_widget_show(vbox);
// Layout Table
table = gtk_table_new(20, 3, false);
gtk_table_set_col_spacings(GTK_TABLE(table), 6);
gtk_box_pack_start(GTK_BOX(vbox), table, false, false, 0);
gtk_widget_show(table);
// Distance Slider
static gchar distance_help[] =
"Butteraugli distance target. Suggested values:"
"\n\td\u00A0=\u00A00.3\tExcellent"
"\n\td\u00A0=\u00A01\tVery Good"
"\n\td\u00A0=\u00A02\tGood"
"\n\td\u00A0=\u00A03\tFair"
"\n\td\u00A0=\u00A06\tPoor";
entry_distance = reinterpret_cast<GtkAdjustment*>(
gimp_scale_entry_new(GTK_TABLE(table), 0, 0, "Distance", kScaleWidth, 0,
jxl_save_opts.distance, 0.0, 15.0, 0.001, 1.0, 3,
true, 0.0, 0.0, distance_help, SAVE_PROC));
gimp_scale_entry_set_logarithmic(reinterpret_cast<GtkObject*>(entry_distance),
true);
// Quality Slider
static gchar quality_help[] =
"JPEG-style Quality is remapped to distance. "
"Values roughly match libjpeg quality settings.";
entry_quality = reinterpret_cast<GtkAdjustment*>(gimp_scale_entry_new(
GTK_TABLE(table), 0, 1, "Quality", kScaleWidth, 0, jxl_save_opts.quality,
8.26, 100.0, 1.0, 10.0, 2, true, 0.0, 0.0, quality_help, SAVE_PROC));
// Distance and Quality Signals
handle_entry_distance = g_signal_connect(
entry_distance, "value-changed", G_CALLBACK(GuiOnChangeDistance), this);
handle_entry_quality = g_signal_connect(entry_quality, "value-changed",
G_CALLBACK(GuiOnChangeQuality), this);
// ----------
separator = gtk_vseparator_new();
gtk_table_attach(GTK_TABLE(table), separator, 0, 2, 2, 3, GTK_EXPAND,
GTK_EXPAND, 9, 9);
gtk_widget_show(separator);
// Encoding Effort / Speed
static gchar effort_help[] =
"Adjust encoding speed. Higher values are faster because "
"the encoder uses less effort to hit distance targets. "
"As\u00A0a\u00A0result, image quality may be decreased. "
"Default\u00A0=\u00A03.";
entry_effort = reinterpret_cast<GtkAdjustment*>(
gimp_scale_entry_new(GTK_TABLE(table), 0, 3, "Speed", kScaleWidth, 0,
10 - jxl_save_opts.encoding_effort, 1, 9, 1, 2, 0,
true, 0.0, 0.0, effort_help, SAVE_PROC));
// effort signal
g_signal_connect(entry_effort, "value-changed", G_CALLBACK(GuiOnChangeEffort),
nullptr);
// ----------
separator = gtk_vseparator_new();
gtk_table_attach(GTK_TABLE(table), separator, 0, 2, 4, 5, GTK_EXPAND,
GTK_EXPAND, 9, 9);
gtk_widget_show(separator);
// Lossless Mode Convenience Checkbox
static gchar lossless_help[] =
"Compress using modular lossless mode. "
"Speed\u00A0is adjusted to improve performance.";
toggle_lossless = gtk_check_button_new_with_label("Lossless Mode");
gimp_help_set_help_data(toggle_lossless, lossless_help, nullptr);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(toggle_lossless),
jxl_save_opts.lossless);
gtk_table_attach_defaults(GTK_TABLE(table), toggle_lossless, 0, 2, 5, 6);
gtk_widget_show(toggle_lossless);
// lossless signal
handle_toggle_lossless = g_signal_connect(
toggle_lossless, "toggled", G_CALLBACK(GuiOnChangeLossless), this);
// ----------
separator = gtk_vseparator_new();
gtk_box_pack_start(GTK_BOX(main_vbox), separator, false, false, 1);
gtk_widget_show(separator);
// Advanced Settings Frame
frame_advanced = gtk_frame_new("Advanced Settings");
gimp_help_set_help_data(frame_advanced,
"Some advanced settings may produce malformed files.",
nullptr);
gtk_frame_set_shadow_type(GTK_FRAME(frame_advanced), GTK_SHADOW_ETCHED_IN);
gtk_box_pack_start(GTK_BOX(main_vbox), frame_advanced, true, true, 0);
gtk_widget_show(frame_advanced);
gtk_widget_set_sensitive(frame_advanced, false);
vbox = gtk_vbox_new(false, 6);
gtk_container_set_border_width(GTK_CONTAINER(vbox), 6);
gtk_container_add(GTK_CONTAINER(frame_advanced), vbox);
gtk_widget_show(vbox);
// uses_original_profile
static gchar uses_original_profile_help[] =
"Prevents conversion to the XYB colorspace. "
"File sizes are approximately doubled.";
toggle_no_xyb = gtk_check_button_new_with_label("Do not use XYB colorspace");
gimp_help_set_help_data(toggle_no_xyb, uses_original_profile_help, nullptr);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(toggle_no_xyb),
jxl_save_opts.basic_info.uses_original_profile);
gtk_box_pack_start(GTK_BOX(vbox), toggle_no_xyb, false, false, 0);
gtk_widget_show(toggle_no_xyb);
g_signal_connect(toggle_no_xyb, "toggled", G_CALLBACK(GuiOnChangeNoXYB),
nullptr);
// save raw codestream
static gchar codestream_help[] =
"Save the raw codestream, without a container. "
"The container is required for metadata and some other features.";
toggle_raw = gtk_check_button_new_with_label("Save Raw Codestream");
gimp_help_set_help_data(toggle_raw, codestream_help, nullptr);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(toggle_raw),
!jxl_save_opts.use_container);
gtk_box_pack_start(GTK_BOX(vbox), toggle_raw, false, false, 0);
gtk_widget_show(toggle_raw);
g_signal_connect(toggle_raw, "toggled", G_CALLBACK(GuiOnChangeCodestream),
nullptr);
// ----------
separator = gtk_vseparator_new();
gtk_box_pack_start(GTK_BOX(vbox), separator, false, false, 1);
gtk_widget_show(separator);
// Faster Decoding / Decoding Speed
static gchar faster_help[] =
"Improve decoding speed at the expense of quality. "
"Default\u00A0=\u00A00.";
table = gtk_table_new(1, 3, false);
gtk_table_set_col_spacings(GTK_TABLE(table), 6);
gtk_container_add(GTK_CONTAINER(vbox), table);
gtk_widget_show(table);
entry_faster = reinterpret_cast<GtkAdjustment*>(
gimp_scale_entry_new(GTK_TABLE(table), 0, 0, "Faster Decoding",
kScaleWidth, 0, jxl_save_opts.faster_decoding, 0, 4,
1, 1, 0, true, 0.0, 0.0, faster_help, SAVE_PROC));
// Faster Decoding Signals
g_signal_connect(entry_faster, "value-changed",
G_CALLBACK(gimp_int_adjustment_update),
&jxl_save_opts.faster_decoding);
// Enable Advanced Settings
frame = gtk_frame_new(nullptr);
gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_NONE);
gtk_box_pack_start(GTK_BOX(main_vbox), frame, true, true, 0);
gtk_widget_show(frame);
vbox = gtk_vbox_new(false, 6);
gtk_container_set_border_width(GTK_CONTAINER(vbox), 6);
gtk_container_add(GTK_CONTAINER(frame), vbox);
gtk_widget_show(vbox);
static gchar advanced_help[] =
"Some advanced settings may produce malformed files.";
toggle = gtk_check_button_new_with_label("Enable Advanced Settings");
gimp_help_set_help_data(toggle, advanced_help, nullptr);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(toggle),
jxl_save_opts.advanced_mode);
gtk_box_pack_start(GTK_BOX(vbox), toggle, false, false, 0);
gtk_widget_show(toggle);
g_signal_connect(toggle, "toggled", G_CALLBACK(GuiOnChangeAdvancedMode),
this);
// show dialog
gtk_widget_show(dialog);
GtkAllocation allocation;
gtk_widget_get_allocation(dialog, &allocation);
int height = allocation.height;
gtk_widget_set_size_request(dialog, height * 1.5, height);
run = (gimp_dialog_run(GIMP_DIALOG(dialog)) == GTK_RESPONSE_OK);
gtk_widget_destroy(dialog);
return run;
} // JpegXlSaveGui::SaveDialog
JpegXlSaveOpts::JpegXlSaveOpts() {
SetDistance(1.0);
pixel_format.num_channels = 4;
pixel_format.data_type = JXL_TYPE_FLOAT;
pixel_format.endianness = JXL_NATIVE_ENDIAN;
pixel_format.align = 0;
JxlEncoderInitBasicInfo(&basic_info);
} // JpegXlSaveOpts constructor
bool JpegXlSaveOpts::SetModel(bool is_linear_) {
int channels;
std::string model;
if (is_gray) {
channels = 1;
if (is_linear_) {
model = "Y";
} else {
model = "Y'";
}
} else {
channels = 3;
if (is_linear_) {
model = "RGB";
} else {
model = "R'G'B'";
}
}
if (has_alpha) {
SetBablModel(model + "A");
SetNumChannels(channels + 1);
} else {
SetBablModel(model);
SetNumChannels(channels);
}
return true;
} // JpegXlSaveOpts::SetModel
bool JpegXlSaveOpts::SetDistance(float dist) {
distance = dist;
return UpdateQuality();
}
bool JpegXlSaveOpts::SetQuality(float qual) {
quality = qual;
return UpdateDistance();
}
bool JpegXlSaveOpts::UpdateQuality() {
float qual;
if (distance < 0.1) {
qual = 100;
} else if (distance > 6.4) {
qual = -5.0 / 53.0 * sqrt(6360.0 * distance - 39975.0) + 1725.0 / 53.0;
lossless = false;
} else {
qual = 100 - (distance - 0.1) / 0.09;
lossless = false;
}
if (qual < 0) {
quality = 0.0;
} else if (qual >= 100) {
quality = 100.0;
} else {
quality = qual;
}
return true;
}
bool JpegXlSaveOpts::UpdateDistance() {
float dist = JxlEncoderDistanceFromQuality(quality);
if (dist > 25) {
distance = 25;
} else {
distance = dist;
}
return true;
}
bool JpegXlSaveOpts::SetDimensions(int x, int y) {
basic_info.xsize = x;
basic_info.ysize = y;
return true;
}
bool JpegXlSaveOpts::SetNumChannels(int channels) {
switch (channels) {
case 1:
pixel_format.num_channels = 1;
basic_info.num_color_channels = 1;
basic_info.num_extra_channels = 0;
basic_info.alpha_bits = 0;
basic_info.alpha_exponent_bits = 0;
break;
case 2:
pixel_format.num_channels = 2;
basic_info.num_color_channels = 1;
basic_info.num_extra_channels = 1;
basic_info.alpha_bits =
static_cast<int>(std::fmin(16, basic_info.bits_per_sample));
basic_info.alpha_exponent_bits = 0;
break;
case 3:
pixel_format.num_channels = 3;
basic_info.num_color_channels = 3;
basic_info.num_extra_channels = 0;
basic_info.alpha_bits = 0;
basic_info.alpha_exponent_bits = 0;
break;
case 4:
pixel_format.num_channels = 4;
basic_info.num_color_channels = 3;
basic_info.num_extra_channels = 1;
basic_info.alpha_bits =
static_cast<int>(std::fmin(16, basic_info.bits_per_sample));
basic_info.alpha_exponent_bits = 0;
break;
default:
SetNumChannels(3);
} // switch
return true;
} // JpegXlSaveOpts::SetNumChannels
bool JpegXlSaveOpts::UpdateBablFormat() {
babl_format_str = babl_model_str + " " + babl_type_str;
return true;
}
bool JpegXlSaveOpts::SetBablModel(std::string model) {
babl_model_str = std::move(model);
return UpdateBablFormat();
}
bool JpegXlSaveOpts::SetBablType(std::string type) {
babl_type_str = std::move(type);
return UpdateBablFormat();
}
bool JpegXlSaveOpts::SetPrecision(int gimp_precision) {
switch (gimp_precision) {
case GIMP_PRECISION_HALF_GAMMA:
case GIMP_PRECISION_HALF_LINEAR:
basic_info.bits_per_sample = 16;
basic_info.exponent_bits_per_sample = 5;
break;
// UINT32 not supported by encoder; using FLOAT instead
case GIMP_PRECISION_U32_GAMMA:
case GIMP_PRECISION_U32_LINEAR:
case GIMP_PRECISION_FLOAT_GAMMA:
case GIMP_PRECISION_FLOAT_LINEAR:
basic_info.bits_per_sample = 32;
basic_info.exponent_bits_per_sample = 8;
break;
case GIMP_PRECISION_U16_GAMMA:
case GIMP_PRECISION_U16_LINEAR:
basic_info.bits_per_sample = 16;
basic_info.exponent_bits_per_sample = 0;
break;
default:
case GIMP_PRECISION_U8_LINEAR:
case GIMP_PRECISION_U8_GAMMA:
basic_info.bits_per_sample = 8;
basic_info.exponent_bits_per_sample = 0;
break;
}
return true;
} // JpegXlSaveOpts::SetPrecision
} // namespace
bool SaveJpegXlImage(const gint32 image_id, const gint32 drawable_id,
const gint32 orig_image_id, const gchar* const filename) {
if (!jxl_save_gui.SaveDialog()) {
return true;
}
gint32 nlayers;
gint32* layers;
gint32 duplicate = gimp_image_duplicate(image_id);
JpegXlGimpProgress gimp_save_progress(
("Saving JPEG XL file:" + std::string(filename)).c_str());
gimp_save_progress.update();
// try to get ICC color profile...
std::vector<uint8_t> icc;
GimpColorProfile* profile = gimp_image_get_effective_color_profile(image_id);
jxl_save_opts.is_gray = gimp_color_profile_is_gray(profile);
jxl_save_opts.is_linear = gimp_color_profile_is_linear(profile);
profile = gimp_image_get_color_profile(image_id);
if (profile) {
g_printerr(SAVE_PROC " Info: Extracting ICC Profile...\n");
gsize icc_size;
const guint8* const icc_bytes =
gimp_color_profile_get_icc_profile(profile, &icc_size);
icc.assign(icc_bytes, icc_bytes + icc_size);
} else {
g_printerr(SAVE_PROC " Info: No ICC profile. Exporting image anyway.\n");
}
gimp_save_progress.update();
jxl_save_opts.SetDimensions(gimp_image_width(image_id),
gimp_image_height(image_id));
jxl_save_opts.SetPrecision(gimp_image_get_precision(image_id));
layers = gimp_image_get_layers(duplicate, &nlayers);
for (int i = 0; i < nlayers; i++) {
if (gimp_drawable_has_alpha(layers[i])) {
jxl_save_opts.has_alpha = true;
break;
}
}
gimp_save_progress.update();
// layers need to match image size, for now
for (int i = 0; i < nlayers; i++) {
gimp_layer_resize_to_image_size(layers[i]);
}
// treat layers as animation frames, for now
if (nlayers > 1) {
jxl_save_opts.basic_info.have_animation = JXL_TRUE;
jxl_save_opts.basic_info.animation.tps_numerator = 100;
}
gimp_save_progress.update();
// multi-threaded parallel runner.
auto runner = JxlResizableParallelRunnerMake(nullptr);
JxlResizableParallelRunnerSetThreads(
runner.get(),
JxlResizableParallelRunnerSuggestThreads(jxl_save_opts.basic_info.xsize,
jxl_save_opts.basic_info.ysize));
auto enc = JxlEncoderMake(/*memory_manager=*/nullptr);
JxlEncoderUseContainer(enc.get(), jxl_save_opts.use_container);
if (JXL_ENC_SUCCESS != JxlEncoderSetParallelRunner(enc.get(),
JxlResizableParallelRunner,
runner.get())) {
g_printerr(SAVE_PROC " Error: JxlEncoderSetParallelRunner failed\n");
return false;
}
// this sets some basic_info properties
jxl_save_opts.SetModel(jxl_save_opts.is_linear);
if (JXL_ENC_SUCCESS !=
JxlEncoderSetBasicInfo(enc.get(), &jxl_save_opts.basic_info)) {
g_printerr(SAVE_PROC " Error: JxlEncoderSetBasicInfo failed\n");
return false;
}
// try to use ICC profile
if (!icc.empty() && !jxl_save_opts.is_gray) {
if (JXL_ENC_SUCCESS ==
JxlEncoderSetICCProfile(enc.get(), icc.data(), icc.size())) {
jxl_save_opts.icc_attached = true;
} else {
g_printerr(SAVE_PROC " Warning: JxlEncoderSetICCProfile failed.\n");
jxl_save_opts.basic_info.uses_original_profile = JXL_FALSE;
jxl_save_opts.lossless = false;
}
} else {
g_printerr(SAVE_PROC " Warning: Using internal profile.\n");
jxl_save_opts.basic_info.uses_original_profile = JXL_FALSE;
jxl_save_opts.lossless = false;
}
// set up internal color profile
JxlColorEncoding color_encoding = {};
if (jxl_save_opts.is_linear) {
JxlColorEncodingSetToLinearSRGB(&color_encoding,
TO_JXL_BOOL(jxl_save_opts.is_gray));
} else {
JxlColorEncodingSetToSRGB(&color_encoding,
TO_JXL_BOOL(jxl_save_opts.is_gray));
}
if (JXL_ENC_SUCCESS !=
JxlEncoderSetColorEncoding(enc.get(), &color_encoding)) {
g_printerr(SAVE_PROC " Warning: JxlEncoderSetColorEncoding failed\n");
}
// set encoder options
JxlEncoderFrameSettings* frame_settings;
frame_settings = JxlEncoderFrameSettingsCreate(enc.get(), nullptr);
JxlEncoderFrameSettingsSetOption(frame_settings, JXL_ENC_FRAME_SETTING_EFFORT,
jxl_save_opts.encoding_effort);
JxlEncoderFrameSettingsSetOption(frame_settings,
JXL_ENC_FRAME_SETTING_DECODING_SPEED,
jxl_save_opts.faster_decoding);
// lossless mode
if (jxl_save_opts.lossless || jxl_save_opts.distance < 0.01) {
if (jxl_save_opts.basic_info.exponent_bits_per_sample > 0) {
// lossless mode doesn't work well with floating point
jxl_save_opts.distance = 0.01;
jxl_save_opts.lossless = false;
JxlEncoderSetFrameLossless(frame_settings, JXL_FALSE);
JxlEncoderSetFrameDistance(frame_settings, 0.01);
} else {
JxlEncoderSetFrameDistance(frame_settings, 0);
JxlEncoderSetFrameLossless(frame_settings, JXL_TRUE);
}
} else {
jxl_save_opts.lossless = false;
JxlEncoderSetFrameLossless(frame_settings, JXL_FALSE);
JxlEncoderSetFrameDistance(frame_settings, jxl_save_opts.distance);
}
// convert precision and colorspace
if (jxl_save_opts.is_linear &&
jxl_save_opts.basic_info.bits_per_sample < 32) {
gimp_image_convert_precision(duplicate, GIMP_PRECISION_FLOAT_LINEAR);
} else {
gimp_image_convert_precision(duplicate, GIMP_PRECISION_FLOAT_GAMMA);
}
// process layers and compress into JXL
size_t buffer_size =
jxl_save_opts.basic_info.xsize * jxl_save_opts.basic_info.ysize *
jxl_save_opts.pixel_format.num_channels * 4; // bytes per sample
for (int i = nlayers - 1; i >= 0; i--) {
gimp_save_progress.update();
// copy image into buffer...
gpointer pixels_buffer_1;
gpointer pixels_buffer_2;
pixels_buffer_1 = g_malloc(buffer_size);
pixels_buffer_2 = g_malloc(buffer_size);
gimp_layer_resize_to_image_size(layers[i]);
GeglBuffer* buffer = gimp_drawable_get_buffer(layers[i]);
// using gegl_buffer_set_format to get the format because
// gegl_buffer_get_format doesn't always get the original format
const Babl* native_format = gegl_buffer_set_format(buffer, nullptr);
gegl_buffer_get(buffer,
GEGL_RECTANGLE(0, 0, jxl_save_opts.basic_info.xsize,
jxl_save_opts.basic_info.ysize),
1.0, native_format, pixels_buffer_1, GEGL_AUTO_ROWSTRIDE,
GEGL_ABYSS_NONE);
g_clear_object(&buffer);
// use babl to fix gamma mismatch issues
jxl_save_opts.SetModel(jxl_save_opts.is_linear);
jxl_save_opts.pixel_format.data_type = JXL_TYPE_FLOAT;
jxl_save_opts.SetBablType("float");
const Babl* destination_format =
babl_format(jxl_save_opts.babl_format_str.c_str());
babl_process(
babl_fish(native_format, destination_format), pixels_buffer_1,
pixels_buffer_2,
jxl_save_opts.basic_info.xsize * jxl_save_opts.basic_info.ysize);
gimp_save_progress.update();
// send layer to encoder
if (JXL_ENC_SUCCESS !=
JxlEncoderAddImageFrame(frame_settings, &jxl_save_opts.pixel_format,
pixels_buffer_2, buffer_size)) {
g_printerr(SAVE_PROC " Error: JxlEncoderAddImageFrame failed\n");
return false;
}
}
JxlEncoderCloseInput(enc.get());
// get data from encoder
std::vector<uint8_t> compressed;
compressed.resize(262144);
uint8_t* next_out = compressed.data();
size_t avail_out = compressed.size();
JxlEncoderStatus process_result = JXL_ENC_NEED_MORE_OUTPUT;
while (process_result == JXL_ENC_NEED_MORE_OUTPUT) {
gimp_save_progress.update();
process_result = JxlEncoderProcessOutput(enc.get(), &next_out, &avail_out);
if (process_result == JXL_ENC_NEED_MORE_OUTPUT) {
size_t offset = next_out - compressed.data();
compressed.resize(compressed.size() + 262144);
next_out = compressed.data() + offset;
avail_out = compressed.size() - offset;
}
}
compressed.resize(next_out - compressed.data());
if (JXL_ENC_SUCCESS != process_result) {
g_printerr(SAVE_PROC " Error: JxlEncoderProcessOutput failed\n");
return false;
}
// write file
std::ofstream outstream(filename, std::ios::out | std::ios::binary);
copy(compressed.begin(), compressed.end(),
std::ostream_iterator<uint8_t>(outstream));
gimp_save_progress.finished();
return true;
} // SaveJpegXlImage()
} // namespace jxl