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godot/modules/tga/image_loader_tga.cpp
Rémi Verschelde d95794ec8a
One Copyright Update to rule them all 
As many open source projects have started doing it, we're removing the
current year from the copyright notice, so that we don't need to bump
it every year.

It seems like only the first year of publication is technically
relevant for copyright notices, and even that seems to be something
that many companies stopped listing altogether (in a version controlled
codebase, the commits are a much better source of date of publication
than a hardcoded copyright statement).

We also now list Godot Engine contributors first as we're collectively
the current maintainers of the project, and we clarify that the
"exclusive" copyright of the co-founders covers the timespan before
opensourcing (their further contributions are included as part of Godot
Engine contributors).

Also fixed "cf." Frenchism - it's meant as "refer to / see".
2023-01-05 13:25:55 +01:00

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/**************************************************************************/
/* image_loader_tga.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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_loader_tga.h"
#include "core/error/error_macros.h"
#include "core/io/file_access_memory.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
Error ImageLoaderTGA::decode_tga_rle(const uint8_t *p_compressed_buffer, size_t p_pixel_size, uint8_t *p_uncompressed_buffer, size_t p_output_size, size_t p_input_size) {
Error error;
Vector<uint8_t> pixels;
error = pixels.resize(p_pixel_size);
if (error != OK) {
return error;
}
uint8_t *pixels_w = pixels.ptrw();
size_t compressed_pos = 0;
size_t output_pos = 0;
size_t c = 0;
size_t count = 0;
while (output_pos < p_output_size) {
c = p_compressed_buffer[compressed_pos];
compressed_pos += 1;
count = (c & 0x7f) + 1;
if (output_pos + count * p_pixel_size > p_output_size) {
return ERR_PARSE_ERROR;
}
if (c & 0x80) {
if (compressed_pos + p_pixel_size > p_input_size) {
return ERR_PARSE_ERROR;
}
for (size_t i = 0; i < p_pixel_size; i++) {
pixels_w[i] = p_compressed_buffer[compressed_pos];
compressed_pos += 1;
}
for (size_t i = 0; i < count; i++) {
for (size_t j = 0; j < p_pixel_size; j++) {
p_uncompressed_buffer[output_pos + j] = pixels_w[j];
}
output_pos += p_pixel_size;
}
} else {
if (compressed_pos + count * p_pixel_size > p_input_size) {
return ERR_PARSE_ERROR;
}
count *= p_pixel_size;
for (size_t i = 0; i < count; i++) {
p_uncompressed_buffer[output_pos] = p_compressed_buffer[compressed_pos];
compressed_pos += 1;
output_pos += 1;
}
}
}
return OK;
}
Error ImageLoaderTGA::convert_to_image(Ref<Image> p_image, const uint8_t *p_buffer, const tga_header_s &p_header, const uint8_t *p_palette, const bool p_is_monochrome, size_t p_input_size) {
#define TGA_PUT_PIXEL(r, g, b, a) \
int image_data_ofs = ((y * width) + x); \
image_data_w[image_data_ofs * 4 + 0] = r; \
image_data_w[image_data_ofs * 4 + 1] = g; \
image_data_w[image_data_ofs * 4 + 2] = b; \
image_data_w[image_data_ofs * 4 + 3] = a;
uint32_t width = p_header.image_width;
uint32_t height = p_header.image_height;
tga_origin_e origin = static_cast<tga_origin_e>((p_header.image_descriptor & TGA_ORIGIN_MASK) >> TGA_ORIGIN_SHIFT);
uint8_t alpha_bits = p_header.image_descriptor & TGA_IMAGE_DESCRIPTOR_ALPHA_MASK;
uint32_t x_start;
int32_t x_step;
uint32_t x_end;
uint32_t y_start;
int32_t y_step;
uint32_t y_end;
if (origin == TGA_ORIGIN_TOP_LEFT || origin == TGA_ORIGIN_TOP_RIGHT) {
y_start = 0;
y_step = 1;
y_end = height;
} else {
y_start = height - 1;
y_step = -1;
y_end = -1;
}
if (origin == TGA_ORIGIN_TOP_LEFT || origin == TGA_ORIGIN_BOTTOM_LEFT) {
x_start = 0;
x_step = 1;
x_end = width;
} else {
x_start = width - 1;
x_step = -1;
x_end = -1;
}
Vector<uint8_t> image_data;
image_data.resize(width * height * sizeof(uint32_t));
uint8_t *image_data_w = image_data.ptrw();
size_t i = 0;
uint32_t x = x_start;
uint32_t y = y_start;
if (p_header.pixel_depth == 8) {
if (p_is_monochrome) {
while (y != y_end) {
while (x != x_end) {
if (i >= p_input_size) {
return ERR_PARSE_ERROR;
}
uint8_t shade = p_buffer[i];
TGA_PUT_PIXEL(shade, shade, shade, 0xff)
x += x_step;
i += 1;
}
x = x_start;
y += y_step;
}
} else {
while (y != y_end) {
while (x != x_end) {
if (i >= p_input_size) {
return ERR_PARSE_ERROR;
}
uint8_t index = p_buffer[i];
uint8_t r = 0x00;
uint8_t g = 0x00;
uint8_t b = 0x00;
uint8_t a = 0xff;
if (p_header.color_map_depth == 24) {
// Due to low-high byte order, the color table must be
// read in the same order as image data (little endian)
r = (p_palette[(index * 3) + 2]);
g = (p_palette[(index * 3) + 1]);
b = (p_palette[(index * 3) + 0]);
} else {
return ERR_INVALID_DATA;
}
TGA_PUT_PIXEL(r, g, b, a)
x += x_step;
i += 1;
}
x = x_start;
y += y_step;
}
}
} else if (p_header.pixel_depth == 16) {
while (y != y_end) {
while (x != x_end) {
if (i + 1 >= p_input_size) {
return ERR_PARSE_ERROR;
}
// Always stored as RGBA5551
uint8_t r = (p_buffer[i + 1] & 0x7c) << 1;
uint8_t g = ((p_buffer[i + 1] & 0x03) << 6) | ((p_buffer[i + 0] & 0xe0) >> 2);
uint8_t b = (p_buffer[i + 0] & 0x1f) << 3;
uint8_t a = (p_buffer[i + 1] & 0x80) ? 0xff : 0;
TGA_PUT_PIXEL(r, g, b, alpha_bits ? a : 0xff);
x += x_step;
i += 2;
}
x = x_start;
y += y_step;
}
} else if (p_header.pixel_depth == 24) {
while (y != y_end) {
while (x != x_end) {
if (i + 2 >= p_input_size) {
return ERR_PARSE_ERROR;
}
uint8_t r = p_buffer[i + 2];
uint8_t g = p_buffer[i + 1];
uint8_t b = p_buffer[i + 0];
TGA_PUT_PIXEL(r, g, b, 0xff)
x += x_step;
i += 3;
}
x = x_start;
y += y_step;
}
} else if (p_header.pixel_depth == 32) {
while (y != y_end) {
while (x != x_end) {
if (i + 3 >= p_input_size) {
return ERR_PARSE_ERROR;
}
uint8_t a = p_buffer[i + 3];
uint8_t r = p_buffer[i + 2];
uint8_t g = p_buffer[i + 1];
uint8_t b = p_buffer[i + 0];
TGA_PUT_PIXEL(r, g, b, a)
x += x_step;
i += 4;
}
x = x_start;
y += y_step;
}
}
p_image->initialize_data(width, height, false, Image::FORMAT_RGBA8, image_data);
return OK;
}
Error ImageLoaderTGA::load_image(Ref<Image> p_image, Ref<FileAccess> f, BitField<ImageFormatLoader::LoaderFlags> p_flags, float p_scale) {
Vector<uint8_t> src_image;
uint64_t src_image_len = f->get_length();
ERR_FAIL_COND_V(src_image_len == 0, ERR_FILE_CORRUPT);
ERR_FAIL_COND_V(src_image_len < (int64_t)sizeof(tga_header_s), ERR_FILE_CORRUPT);
src_image.resize(src_image_len);
Error err = OK;
tga_header_s tga_header;
tga_header.id_length = f->get_8();
tga_header.color_map_type = f->get_8();
tga_header.image_type = static_cast<tga_type_e>(f->get_8());
tga_header.first_color_entry = f->get_16();
tga_header.color_map_length = f->get_16();
tga_header.color_map_depth = f->get_8();
tga_header.x_origin = f->get_16();
tga_header.y_origin = f->get_16();
tga_header.image_width = f->get_16();
tga_header.image_height = f->get_16();
tga_header.pixel_depth = f->get_8();
tga_header.image_descriptor = f->get_8();
bool is_encoded = (tga_header.image_type == TGA_TYPE_RLE_INDEXED || tga_header.image_type == TGA_TYPE_RLE_RGB || tga_header.image_type == TGA_TYPE_RLE_MONOCHROME);
bool has_color_map = (tga_header.image_type == TGA_TYPE_RLE_INDEXED || tga_header.image_type == TGA_TYPE_INDEXED);
bool is_monochrome = (tga_header.image_type == TGA_TYPE_RLE_MONOCHROME || tga_header.image_type == TGA_TYPE_MONOCHROME);
if (tga_header.image_type == TGA_TYPE_NO_DATA) {
err = FAILED;
}
uint64_t color_map_size;
if (has_color_map) {
if (tga_header.color_map_length > 256 || (tga_header.color_map_depth != 24) || tga_header.color_map_type != 1) {
err = FAILED;
}
color_map_size = tga_header.color_map_length * (tga_header.color_map_depth >> 3);
} else {
if (tga_header.color_map_type) {
err = FAILED;
}
color_map_size = 0;
}
if ((src_image_len - f->get_position()) < (tga_header.id_length + color_map_size)) {
err = FAILED; // TGA data appears to be truncated (fewer bytes than expected).
}
if (tga_header.image_width <= 0 || tga_header.image_height <= 0) {
err = FAILED;
}
if (!(tga_header.pixel_depth == 8 || tga_header.pixel_depth == 16 || tga_header.pixel_depth == 24 || tga_header.pixel_depth == 32)) {
err = FAILED;
}
if (err == OK) {
f->seek(f->get_position() + tga_header.id_length);
Vector<uint8_t> palette;
if (has_color_map) {
err = palette.resize(color_map_size);
if (err == OK) {
uint8_t *palette_w = palette.ptrw();
f->get_buffer(&palette_w[0], color_map_size);
} else {
return OK;
}
}
uint8_t *src_image_w = src_image.ptrw();
f->get_buffer(&src_image_w[0], src_image_len - f->get_position());
const uint8_t *src_image_r = src_image.ptr();
const size_t pixel_size = tga_header.pixel_depth >> 3;
size_t buffer_size = (tga_header.image_width * tga_header.image_height) * pixel_size;
Vector<uint8_t> uncompressed_buffer;
uncompressed_buffer.resize(buffer_size);
uint8_t *uncompressed_buffer_w = uncompressed_buffer.ptrw();
const uint8_t *uncompressed_buffer_r;
const uint8_t *buffer = nullptr;
if (is_encoded) {
err = decode_tga_rle(src_image_r, pixel_size, uncompressed_buffer_w, buffer_size, src_image_len);
if (err == OK) {
uncompressed_buffer_r = uncompressed_buffer.ptr();
buffer = uncompressed_buffer_r;
}
} else {
buffer = src_image_r;
buffer_size = src_image_len;
};
if (err == OK) {
const uint8_t *palette_r = palette.ptr();
err = convert_to_image(p_image, buffer, tga_header, palette_r, is_monochrome, buffer_size);
}
}
return err;
}
void ImageLoaderTGA::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("tga");
}
static Ref<Image> _tga_mem_loader_func(const uint8_t *p_tga, int p_size) {
Ref<FileAccessMemory> memfile;
memfile.instantiate();
Error open_memfile_error = memfile->open_custom(p_tga, p_size);
ERR_FAIL_COND_V_MSG(open_memfile_error, Ref<Image>(), "Could not create memfile for TGA image buffer.");
Ref<Image> img;
img.instantiate();
Error load_error = ImageLoaderTGA().load_image(img, memfile, false, 1.0f);
ERR_FAIL_COND_V_MSG(load_error, Ref<Image>(), "Failed to load TGA image.");
return img;
}
ImageLoaderTGA::ImageLoaderTGA() {
Image::_tga_mem_loader_func = _tga_mem_loader_func;
}
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