250 lines
7.7 KiB
C++
250 lines
7.7 KiB
C++
/*************************************************************************/
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/* image_loader_tinyexr.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "image_loader_tinyexr.h"
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#include "core/os/os.h"
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#include "core/print_string.h"
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#include "thirdparty/tinyexr/tinyexr.h"
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Error ImageLoaderTinyEXR::load_image(Ref<Image> p_image, FileAccess *f, bool p_force_linear, float p_scale) {
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Vector<uint8_t> src_image;
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int src_image_len = f->get_len();
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ERR_FAIL_COND_V(src_image_len == 0, ERR_FILE_CORRUPT);
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src_image.resize(src_image_len);
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uint8_t *w = src_image.ptrw();
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f->get_buffer(&w[0], src_image_len);
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f->close();
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// Re-implementation of tinyexr's LoadEXRFromMemory using Godot types to store the Image data
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// and Godot's error codes.
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// When debugging after updating the thirdparty library, check that we're still in sync with
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// their API usage in LoadEXRFromMemory.
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EXRVersion exr_version;
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EXRImage exr_image;
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EXRHeader exr_header;
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const char *err = nullptr;
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InitEXRHeader(&exr_header);
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int ret = ParseEXRVersionFromMemory(&exr_version, w, src_image_len);
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if (ret != TINYEXR_SUCCESS) {
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return ERR_FILE_CORRUPT;
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}
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ret = ParseEXRHeaderFromMemory(&exr_header, &exr_version, w, src_image_len, &err);
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if (ret != TINYEXR_SUCCESS) {
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if (err) {
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ERR_PRINT(String(err));
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}
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return ERR_FILE_CORRUPT;
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}
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// Read HALF channel as FLOAT. (GH-13490)
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for (int i = 0; i < exr_header.num_channels; i++) {
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if (exr_header.pixel_types[i] == TINYEXR_PIXELTYPE_HALF) {
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exr_header.requested_pixel_types[i] = TINYEXR_PIXELTYPE_FLOAT;
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}
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}
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InitEXRImage(&exr_image);
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ret = LoadEXRImageFromMemory(&exr_image, &exr_header, w, src_image_len, &err);
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if (ret != TINYEXR_SUCCESS) {
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if (err) {
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ERR_PRINT(String(err));
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}
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return ERR_FILE_CORRUPT;
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}
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// RGBA
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int idxR = -1;
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int idxG = -1;
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int idxB = -1;
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int idxA = -1;
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for (int c = 0; c < exr_header.num_channels; c++) {
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if (strcmp(exr_header.channels[c].name, "R") == 0) {
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idxR = c;
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} else if (strcmp(exr_header.channels[c].name, "G") == 0) {
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idxG = c;
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} else if (strcmp(exr_header.channels[c].name, "B") == 0) {
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idxB = c;
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} else if (strcmp(exr_header.channels[c].name, "A") == 0) {
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idxA = c;
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}
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}
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if (exr_header.num_channels == 1) {
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// Grayscale channel only.
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idxR = 0;
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idxG = 0;
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idxB = 0;
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idxA = 0;
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} else {
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// Assume RGB(A)
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if (idxR == -1) {
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ERR_PRINT("TinyEXR: R channel not found.");
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// @todo { free exr_image }
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return ERR_FILE_CORRUPT;
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}
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if (idxG == -1) {
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ERR_PRINT("TinyEXR: G channel not found.");
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// @todo { free exr_image }
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return ERR_FILE_CORRUPT;
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}
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if (idxB == -1) {
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ERR_PRINT("TinyEXR: B channel not found.");
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// @todo { free exr_image }
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return ERR_FILE_CORRUPT;
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}
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}
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// EXR image data loaded, now parse it into Godot-friendly image data
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Vector<uint8_t> imgdata;
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Image::Format format;
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int output_channels = 0;
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if (idxA != -1) {
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imgdata.resize(exr_image.width * exr_image.height * 8); //RGBA16
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format = Image::FORMAT_RGBAH;
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output_channels = 4;
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} else {
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imgdata.resize(exr_image.width * exr_image.height * 6); //RGB16
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format = Image::FORMAT_RGBH;
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output_channels = 3;
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}
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EXRTile single_image_tile;
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int num_tiles;
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int tile_width = 0;
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int tile_height = 0;
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const EXRTile *exr_tiles;
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if (!exr_header.tiled) {
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single_image_tile.images = exr_image.images;
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single_image_tile.width = exr_image.width;
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single_image_tile.height = exr_image.height;
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single_image_tile.level_x = exr_image.width;
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single_image_tile.level_y = exr_image.height;
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single_image_tile.offset_x = 0;
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single_image_tile.offset_y = 0;
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exr_tiles = &single_image_tile;
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num_tiles = 1;
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tile_width = exr_image.width;
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tile_height = exr_image.height;
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} else {
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tile_width = exr_header.tile_size_x;
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tile_height = exr_header.tile_size_y;
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num_tiles = exr_image.num_tiles;
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exr_tiles = exr_image.tiles;
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}
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{
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uint8_t *wd = imgdata.ptrw();
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uint16_t *iw = (uint16_t *)wd;
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// Assume `out_rgba` have enough memory allocated.
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for (int tile_index = 0; tile_index < num_tiles; tile_index++) {
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const EXRTile &tile = exr_tiles[tile_index];
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int tw = tile.width;
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int th = tile.height;
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const float *r_channel_start = reinterpret_cast<const float *>(tile.images[idxR]);
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const float *g_channel_start = reinterpret_cast<const float *>(tile.images[idxG]);
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const float *b_channel_start = reinterpret_cast<const float *>(tile.images[idxB]);
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const float *a_channel_start = nullptr;
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if (idxA != -1) {
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a_channel_start = reinterpret_cast<const float *>(tile.images[idxA]);
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}
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uint16_t *first_row_w = iw + (tile.offset_y * tile_height * exr_image.width + tile.offset_x * tile_width) * output_channels;
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for (int y = 0; y < th; y++) {
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const float *r_channel = r_channel_start + y * tile_width;
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const float *g_channel = g_channel_start + y * tile_width;
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const float *b_channel = b_channel_start + y * tile_width;
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const float *a_channel = nullptr;
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if (a_channel_start) {
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a_channel = a_channel_start + y * tile_width;
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}
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uint16_t *row_w = first_row_w + (y * exr_image.width * output_channels);
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for (int x = 0; x < tw; x++) {
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Color color(*r_channel++, *g_channel++, *b_channel++);
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if (p_force_linear)
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color = color.to_linear();
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*row_w++ = Math::make_half_float(color.r);
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*row_w++ = Math::make_half_float(color.g);
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*row_w++ = Math::make_half_float(color.b);
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if (idxA != -1) {
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*row_w++ = Math::make_half_float(*a_channel++);
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}
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}
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}
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}
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}
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p_image->create(exr_image.width, exr_image.height, false, format, imgdata);
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FreeEXRHeader(&exr_header);
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FreeEXRImage(&exr_image);
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return OK;
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}
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void ImageLoaderTinyEXR::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("exr");
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}
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ImageLoaderTinyEXR::ImageLoaderTinyEXR() {
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}
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