mirror/godot
2
0
Fork 0
mirror of https://github.com/godotengine/godot.git synced 2024-12-15 10:12:40 +08:00
Code Issues Packages Projects Releases Wiki Activity
e3a06c3a9e
godot/modules/tga/image_loader_tga.cpp

355 lines
11 KiB
C++
Raw Blame History

/*************************************************************************/
/* image_loader_tga.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 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_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);
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 == 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->create(width, height, false, Image::FORMAT_RGBA8, image_data);
return OK;
}
Error ImageLoaderTGA::load_image(Ref<Image> p_image, FileAccess *f, bool p_force_linear, 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;
}
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;
}
} else {
if (tga_header.color_map_type) {
err = FAILED;
}
}
if (tga_header.image_width <= 0 || tga_header.image_height <= 0) {
err = FAILED;
}
if (!(tga_header.pixel_depth == 8 || 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) {
size_t color_map_size = tga_header.color_map_length * (tga_header.color_map_depth >> 3);
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);
}
}
f->close();
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) {
FileAccessMemory memfile;
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;
}
Reference in New Issue View Git Blame Copy Permalink