349 lines
10 KiB
C++
349 lines
10 KiB
C++
/*************************************************************************/
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/* image_loader_tga.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) 2007-2021 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2021 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_tga.h"
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#include "core/error/error_macros.h"
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#include "core/io/file_access_memory.h"
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#include "core/os/os.h"
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#include "core/string/print_string.h"
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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) {
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Error error;
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Vector<uint8_t> pixels;
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error = pixels.resize(p_pixel_size);
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if (error != OK) {
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return error;
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}
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uint8_t *pixels_w = pixels.ptrw();
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size_t compressed_pos = 0;
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size_t output_pos = 0;
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size_t c = 0;
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size_t count = 0;
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while (output_pos < p_output_size) {
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c = p_compressed_buffer[compressed_pos];
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compressed_pos += 1;
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count = (c & 0x7f) + 1;
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if (output_pos + count * p_pixel_size > output_pos) {
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return ERR_PARSE_ERROR;
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}
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if (c & 0x80) {
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for (size_t i = 0; i < p_pixel_size; i++) {
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pixels_w[i] = p_compressed_buffer[compressed_pos];
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compressed_pos += 1;
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}
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for (size_t i = 0; i < count; i++) {
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for (size_t j = 0; j < p_pixel_size; j++) {
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p_uncompressed_buffer[output_pos + j] = pixels_w[j];
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}
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output_pos += p_pixel_size;
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}
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} else {
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count *= p_pixel_size;
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for (size_t i = 0; i < count; i++) {
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p_uncompressed_buffer[output_pos] = p_compressed_buffer[compressed_pos];
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compressed_pos += 1;
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output_pos += 1;
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}
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}
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}
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return OK;
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}
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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_output_size) {
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#define TGA_PUT_PIXEL(r, g, b, a) \
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int image_data_ofs = ((y * width) + x); \
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image_data_w[image_data_ofs * 4 + 0] = r; \
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image_data_w[image_data_ofs * 4 + 1] = g; \
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image_data_w[image_data_ofs * 4 + 2] = b; \
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image_data_w[image_data_ofs * 4 + 3] = a;
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uint32_t width = p_header.image_width;
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uint32_t height = p_header.image_height;
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tga_origin_e origin = static_cast<tga_origin_e>((p_header.image_descriptor & TGA_ORIGIN_MASK) >> TGA_ORIGIN_SHIFT);
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uint32_t x_start;
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int32_t x_step;
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uint32_t x_end;
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uint32_t y_start;
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int32_t y_step;
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uint32_t y_end;
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if (origin == TGA_ORIGIN_TOP_LEFT || origin == TGA_ORIGIN_TOP_RIGHT) {
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y_start = 0;
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y_step = 1;
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y_end = height;
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} else {
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y_start = height - 1;
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y_step = -1;
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y_end = -1;
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}
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if (origin == TGA_ORIGIN_TOP_LEFT || origin == TGA_ORIGIN_BOTTOM_LEFT) {
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x_start = 0;
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x_step = 1;
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x_end = width;
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} else {
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x_start = width - 1;
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x_step = -1;
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x_end = -1;
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}
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Vector<uint8_t> image_data;
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image_data.resize(width * height * sizeof(uint32_t));
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uint8_t *image_data_w = image_data.ptrw();
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size_t i = 0;
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uint32_t x = x_start;
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uint32_t y = y_start;
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if (p_header.pixel_depth == 8) {
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if (p_is_monochrome) {
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while (y != y_end) {
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while (x != x_end) {
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if (i > p_output_size) {
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return ERR_PARSE_ERROR;
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}
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uint8_t shade = p_buffer[i];
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TGA_PUT_PIXEL(shade, shade, shade, 0xff)
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x += x_step;
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i += 1;
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}
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x = x_start;
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y += y_step;
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}
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} else {
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while (y != y_end) {
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while (x != x_end) {
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if (i > p_output_size) {
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return ERR_PARSE_ERROR;
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}
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uint8_t index = p_buffer[i];
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uint8_t r = 0x00;
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uint8_t g = 0x00;
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uint8_t b = 0x00;
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uint8_t a = 0xff;
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if (p_header.color_map_depth == 24) {
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// Due to low-high byte order, the color table must be
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// read in the same order as image data (little endian)
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r = (p_palette[(index * 3) + 2]);
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g = (p_palette[(index * 3) + 1]);
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b = (p_palette[(index * 3) + 0]);
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} else {
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return ERR_INVALID_DATA;
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}
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TGA_PUT_PIXEL(r, g, b, a)
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x += x_step;
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i += 1;
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}
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x = x_start;
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y += y_step;
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}
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}
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} else if (p_header.pixel_depth == 24) {
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while (y != y_end) {
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while (x != x_end) {
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if (i + 2 > p_output_size) {
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return ERR_PARSE_ERROR;
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}
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uint8_t r = p_buffer[i + 2];
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uint8_t g = p_buffer[i + 1];
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uint8_t b = p_buffer[i + 0];
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TGA_PUT_PIXEL(r, g, b, 0xff)
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x += x_step;
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i += 3;
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}
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x = x_start;
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y += y_step;
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}
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} else if (p_header.pixel_depth == 32) {
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while (y != y_end) {
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while (x != x_end) {
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if (i + 3 > p_output_size) {
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return ERR_PARSE_ERROR;
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}
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uint8_t a = p_buffer[i + 3];
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uint8_t r = p_buffer[i + 2];
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uint8_t g = p_buffer[i + 1];
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uint8_t b = p_buffer[i + 0];
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TGA_PUT_PIXEL(r, g, b, a)
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x += x_step;
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i += 4;
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}
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x = x_start;
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y += y_step;
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}
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}
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p_image->create(width, height, false, Image::FORMAT_RGBA8, image_data);
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return OK;
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}
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Error ImageLoaderTGA::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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uint64_t 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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ERR_FAIL_COND_V(src_image_len < (int64_t)sizeof(tga_header_s), ERR_FILE_CORRUPT);
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src_image.resize(src_image_len);
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Error err = OK;
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tga_header_s tga_header;
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tga_header.id_length = f->get_8();
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tga_header.color_map_type = f->get_8();
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tga_header.image_type = static_cast<tga_type_e>(f->get_8());
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tga_header.first_color_entry = f->get_16();
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tga_header.color_map_length = f->get_16();
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tga_header.color_map_depth = f->get_8();
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tga_header.x_origin = f->get_16();
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tga_header.y_origin = f->get_16();
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tga_header.image_width = f->get_16();
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tga_header.image_height = f->get_16();
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tga_header.pixel_depth = f->get_8();
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tga_header.image_descriptor = f->get_8();
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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);
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bool has_color_map = (tga_header.image_type == TGA_TYPE_RLE_INDEXED || tga_header.image_type == TGA_TYPE_INDEXED);
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bool is_monochrome = (tga_header.image_type == TGA_TYPE_RLE_MONOCHROME || tga_header.image_type == TGA_TYPE_MONOCHROME);
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if (tga_header.image_type == TGA_TYPE_NO_DATA) {
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err = FAILED;
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}
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if (has_color_map) {
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if (tga_header.color_map_length > 256 || (tga_header.color_map_depth != 24) || tga_header.color_map_type != 1) {
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err = FAILED;
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}
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} else {
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if (tga_header.color_map_type) {
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err = FAILED;
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}
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}
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if (tga_header.image_width <= 0 || tga_header.image_height <= 0) {
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err = FAILED;
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}
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if (!(tga_header.pixel_depth == 8 || tga_header.pixel_depth == 24 || tga_header.pixel_depth == 32)) {
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err = FAILED;
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}
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if (err == OK) {
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f->seek(f->get_position() + tga_header.id_length);
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Vector<uint8_t> palette;
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if (has_color_map) {
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size_t color_map_size = tga_header.color_map_length * (tga_header.color_map_depth >> 3);
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err = palette.resize(color_map_size);
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if (err == OK) {
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uint8_t *palette_w = palette.ptrw();
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f->get_buffer(&palette_w[0], color_map_size);
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} else {
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return OK;
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}
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}
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uint8_t *src_image_w = src_image.ptrw();
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f->get_buffer(&src_image_w[0], src_image_len - f->get_position());
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const uint8_t *src_image_r = src_image.ptr();
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const size_t pixel_size = tga_header.pixel_depth >> 3;
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size_t buffer_size = (tga_header.image_width * tga_header.image_height) * pixel_size;
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Vector<uint8_t> uncompressed_buffer;
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uncompressed_buffer.resize(buffer_size);
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uint8_t *uncompressed_buffer_w = uncompressed_buffer.ptrw();
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const uint8_t *uncompressed_buffer_r;
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const uint8_t *buffer = nullptr;
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if (is_encoded) {
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err = decode_tga_rle(src_image_r, pixel_size, uncompressed_buffer_w, buffer_size);
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if (err == OK) {
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uncompressed_buffer_r = uncompressed_buffer.ptr();
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buffer = uncompressed_buffer_r;
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}
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} else {
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buffer = src_image_r;
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buffer_size = src_image_len;
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};
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if (err == OK) {
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const uint8_t *palette_r = palette.ptr();
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err = convert_to_image(p_image, buffer, tga_header, palette_r, is_monochrome, buffer_size);
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}
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}
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f->close();
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return err;
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}
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void ImageLoaderTGA::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("tga");
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}
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static Ref<Image> _tga_mem_loader_func(const uint8_t *p_tga, int p_size) {
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FileAccessMemory memfile;
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Error open_memfile_error = memfile.open_custom(p_tga, p_size);
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ERR_FAIL_COND_V_MSG(open_memfile_error, Ref<Image>(), "Could not create memfile for TGA image buffer.");
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Ref<Image> img;
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img.instance();
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Error load_error = ImageLoaderTGA().load_image(img, &memfile, false, 1.0f);
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ERR_FAIL_COND_V_MSG(load_error, Ref<Image>(), "Failed to load TGA image.");
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return img;
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}
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ImageLoaderTGA::ImageLoaderTGA() {
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Image::_tga_mem_loader_func = _tga_mem_loader_func;
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}
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