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godot/modules/tinyexr/image_saver_tinyexr.cpp

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/*************************************************************************/
/* image_saver_tinyexr.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "image_saver_tinyexr.h"
#include "core/math/math_funcs.h"
#include "thirdparty/tinyexr/tinyexr.h"
static bool is_supported_format(Image::Format p_format) {
// This is checked before anything else.
// Mostly uncompressed formats are considered.
switch (p_format) {
case Image::FORMAT_RF:
case Image::FORMAT_RGF:
case Image::FORMAT_RGBF:
case Image::FORMAT_RGBAF:
case Image::FORMAT_RH:
case Image::FORMAT_RGH:
case Image::FORMAT_RGBH:
case Image::FORMAT_RGBAH:
case Image::FORMAT_R8:
case Image::FORMAT_RG8:
case Image::FORMAT_RGB8:
case Image::FORMAT_RGBA8:
return true;
default:
return false;
}
}
enum SrcPixelType {
SRC_FLOAT,
SRC_HALF,
SRC_BYTE
};
static SrcPixelType get_source_pixel_type(Image::Format p_format) {
switch (p_format) {
case Image::FORMAT_RF:
case Image::FORMAT_RGF:
case Image::FORMAT_RGBF:
case Image::FORMAT_RGBAF:
return SRC_FLOAT;
case Image::FORMAT_RH:
case Image::FORMAT_RGH:
case Image::FORMAT_RGBH:
case Image::FORMAT_RGBAH:
return SRC_HALF;
case Image::FORMAT_R8:
case Image::FORMAT_RG8:
case Image::FORMAT_RGB8:
case Image::FORMAT_RGBA8:
return SRC_BYTE;
default:
CRASH_NOW();
}
}
static int get_target_pixel_type(Image::Format p_format) {
switch (p_format) {
case Image::FORMAT_RF:
case Image::FORMAT_RGF:
case Image::FORMAT_RGBF:
case Image::FORMAT_RGBAF:
return TINYEXR_PIXELTYPE_FLOAT;
case Image::FORMAT_RH:
case Image::FORMAT_RGH:
case Image::FORMAT_RGBH:
case Image::FORMAT_RGBAH:
// EXR doesn't support 8-bit channels so in that case we'll convert
case Image::FORMAT_R8:
case Image::FORMAT_RG8:
case Image::FORMAT_RGB8:
case Image::FORMAT_RGBA8:
return TINYEXR_PIXELTYPE_HALF;
default:
CRASH_NOW();
}
}
static int get_pixel_type_size(int p_pixel_type) {
switch (p_pixel_type) {
case TINYEXR_PIXELTYPE_HALF:
return 2;
case TINYEXR_PIXELTYPE_FLOAT:
return 4;
}
CRASH_NOW();
}
static int get_channel_count(Image::Format p_format) {
switch (p_format) {
case Image::FORMAT_RF:
case Image::FORMAT_RH:
case Image::FORMAT_R8:
return 1;
case Image::FORMAT_RGF:
case Image::FORMAT_RGH:
case Image::FORMAT_RG8:
return 2;
case Image::FORMAT_RGBF:
case Image::FORMAT_RGBH:
case Image::FORMAT_RGB8:
return 3;
case Image::FORMAT_RGBAF:
case Image::FORMAT_RGBAH:
case Image::FORMAT_RGBA8:
return 4;
default:
CRASH_NOW();
}
}
Error save_exr(const String &p_path, const Ref<Image> &p_img, bool p_grayscale) {
Image::Format format = p_img->get_format();
if (!is_supported_format(format)) {
// Format not supported
print_error("Image format not supported for saving as EXR. Consider saving as PNG.");
return ERR_UNAVAILABLE;
}
EXRHeader header;
InitEXRHeader(&header);
EXRImage image;
InitEXRImage(&image);
const int max_channels = 4;
// Godot does not support more than 4 channels,
// so we can preallocate header infos on the stack and use only the subset we need
PoolByteArray channels[max_channels];
unsigned char *channels_ptrs[max_channels];
EXRChannelInfo channel_infos[max_channels];
int pixel_types[max_channels];
int requested_pixel_types[max_channels] = { -1 };
// Gimp and Blender are a bit annoying so order of channels isn't straightforward.
const int channel_mappings[4][4] = {
{ 0 }, // R
{ 1, 0 }, // GR
{ 2, 1, 0 }, // BGR
{ 2, 1, 0, 3 } // BGRA
};
int channel_count = get_channel_count(format);
ERR_FAIL_COND_V(p_grayscale && channel_count != 1, ERR_INVALID_PARAMETER);
int target_pixel_type = get_target_pixel_type(format);
int target_pixel_type_size = get_pixel_type_size(target_pixel_type);
SrcPixelType src_pixel_type = get_source_pixel_type(format);
const int pixel_count = p_img->get_width() * p_img->get_height();
const int *channel_mapping = channel_mappings[channel_count - 1];
{
PoolByteArray src_data = p_img->get_data();
PoolByteArray::Read src_r = src_data.read();
for (int channel_index = 0; channel_index < channel_count; ++channel_index) {
// De-interleave channels
PoolByteArray &dst = channels[channel_index];
dst.resize(pixel_count * target_pixel_type_size);
PoolByteArray::Write dst_w = dst.write();
if (src_pixel_type == SRC_FLOAT && target_pixel_type == TINYEXR_PIXELTYPE_FLOAT) {
// Note: we don't save mipmaps
CRASH_COND(src_data.size() < pixel_count * channel_count * target_pixel_type_size);
const float *src_rp = (float *)src_r.ptr();
float *dst_wp = (float *)dst_w.ptr();
for (int i = 0; i < pixel_count; ++i) {
dst_wp[i] = src_rp[channel_index + i * channel_count];
}
} else if (src_pixel_type == SRC_HALF && target_pixel_type == TINYEXR_PIXELTYPE_HALF) {
CRASH_COND(src_data.size() < pixel_count * channel_count * target_pixel_type_size);
const uint16_t *src_rp = (uint16_t *)src_r.ptr();
uint16_t *dst_wp = (uint16_t *)dst_w.ptr();
for (int i = 0; i < pixel_count; ++i) {
dst_wp[i] = src_rp[channel_index + i * channel_count];
}
} else if (src_pixel_type == SRC_BYTE && target_pixel_type == TINYEXR_PIXELTYPE_HALF) {
CRASH_COND(src_data.size() < pixel_count * channel_count);
const uint8_t *src_rp = (uint8_t *)src_r.ptr();
uint16_t *dst_wp = (uint16_t *)dst_w.ptr();
for (int i = 0; i < pixel_count; ++i) {
dst_wp[i] = Math::make_half_float(src_rp[channel_index + i * channel_count] / 255.f);
}
} else {
CRASH_NOW();
}
int remapped_index = channel_mapping[channel_index];
channels_ptrs[remapped_index] = dst_w.ptr();
// No conversion
pixel_types[remapped_index] = target_pixel_type;
requested_pixel_types[remapped_index] = target_pixel_type;
// Write channel name
if (p_grayscale) {
channel_infos[remapped_index].name[0] = 'Y';
channel_infos[remapped_index].name[1] = '\0';
} else {
const char *rgba = "RGBA";
channel_infos[remapped_index].name[0] = rgba[channel_index];
channel_infos[remapped_index].name[1] = '\0';
}
}
}
image.images = channels_ptrs;
image.num_channels = channel_count;
image.width = p_img->get_width();
image.height = p_img->get_height();
header.num_channels = image.num_channels;
header.channels = channel_infos;
header.pixel_types = pixel_types;
header.requested_pixel_types = requested_pixel_types;
CharString utf8_filename = p_path.utf8();
const char *err;
int ret = SaveEXRImageToFile(&image, &header, utf8_filename.ptr(), &err);
if (ret != TINYEXR_SUCCESS) {
print_error(String("Saving EXR failed. Error: {0}").format(varray(err)));
return ERR_FILE_CANT_WRITE;
}
return OK;
}
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