/*************************************************************************/ /* image_loader_tga.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_loader_tga.h" #include "core/os/os.h" #include "core/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) { Error error; PoolVector pixels; error = pixels.resize(p_pixel_size); if (error != OK) return error; PoolVector::Write pixels_w = pixels.write(); 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 (c & 0x80) { for (size_t i = 0; i < p_pixel_size; i++) { pixels_w.ptr()[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.ptr()[j]; } output_pos += p_pixel_size; } } else { 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 p_image, const uint8_t *p_buffer, const tga_header_s &p_header, const uint8_t *p_palette, const bool p_is_monochrome) { #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((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; } PoolVector image_data; image_data.resize(width * height * sizeof(uint32_t)); PoolVector::Write image_data_w = image_data.write(); 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) { 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) { 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) { 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) { 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; } } image_data_w.release(); p_image->create(width, height, 0, Image::FORMAT_RGBA8, image_data); return OK; } Error ImageLoaderTGA::load_image(Ref p_image, FileAccess *f, bool p_force_linear, float p_scale) { PoolVector src_image; int src_image_len = f->get_len(); ERR_FAIL_COND_V(src_image_len == 0, ERR_FILE_CORRUPT); ERR_FAIL_COND_V(src_image_len < (int)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(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); PoolVector 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) { PoolVector::Write palette_w = palette.write(); f->get_buffer(&palette_w[0], color_map_size); } else { return OK; } } PoolVector::Write src_image_w = src_image.write(); f->get_buffer(&src_image_w[0], src_image_len - f->get_position()); PoolVector::Read src_image_r = src_image.read(); const size_t pixel_size = tga_header.pixel_depth >> 3; const size_t buffer_size = (tga_header.image_width * tga_header.image_height) * pixel_size; PoolVector uncompressed_buffer; uncompressed_buffer.resize(buffer_size); PoolVector::Write uncompressed_buffer_w = uncompressed_buffer.write(); PoolVector::Read uncompressed_buffer_r; const uint8_t *buffer = NULL; if (is_encoded) { err = decode_tga_rle(src_image_r.ptr(), pixel_size, uncompressed_buffer_w.ptr(), buffer_size); if (err == OK) { uncompressed_buffer_r = uncompressed_buffer.read(); buffer = uncompressed_buffer_r.ptr(); } } else { buffer = src_image_r.ptr(); }; if (err == OK) { PoolVector::Read palette_r = palette.read(); err = convert_to_image(p_image, buffer, tga_header, palette_r.ptr(), is_monochrome); } } f->close(); return err; } void ImageLoaderTGA::get_recognized_extensions(List *p_extensions) const { p_extensions->push_back("tga"); } ImageLoaderTGA::ImageLoaderTGA() { }