d95794ec8a
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".
308 lines
12 KiB
C++
308 lines
12 KiB
C++
/**************************************************************************/
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/* image_loader_bmp.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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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_bmp.h"
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#include "core/io/file_access_memory.h"
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Error ImageLoaderBMP::convert_to_image(Ref<Image> p_image,
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const uint8_t *p_buffer,
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const uint8_t *p_color_buffer,
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const uint32_t color_table_size,
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const bmp_header_s &p_header) {
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Error err = OK;
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if (p_buffer == nullptr) {
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err = FAILED;
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}
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if (err == OK) {
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size_t index = 0;
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size_t width = (size_t)p_header.bmp_info_header.bmp_width;
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size_t height = (size_t)p_header.bmp_info_header.bmp_height;
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size_t bits_per_pixel = (size_t)p_header.bmp_info_header.bmp_bit_count;
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// Check whether we can load it
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if (bits_per_pixel == 1) {
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// Requires bit unpacking...
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ERR_FAIL_COND_V_MSG(width % 8 != 0, ERR_UNAVAILABLE,
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vformat("1-bpp BMP images must have a width that is a multiple of 8, but the imported BMP is %d pixels wide.", int(width)));
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ERR_FAIL_COND_V_MSG(height % 8 != 0, ERR_UNAVAILABLE,
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vformat("1-bpp BMP images must have a height that is a multiple of 8, but the imported BMP is %d pixels tall.", int(height)));
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} else if (bits_per_pixel == 4) {
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// Requires bit unpacking...
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ERR_FAIL_COND_V_MSG(width % 2 != 0, ERR_UNAVAILABLE,
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vformat("4-bpp BMP images must have a width that is a multiple of 2, but the imported BMP is %d pixels wide.", int(width)));
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ERR_FAIL_COND_V_MSG(height % 2 != 0, ERR_UNAVAILABLE,
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vformat("4-bpp BMP images must have a height that is a multiple of 2, but the imported BMP is %d pixels tall.", int(height)));
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} else if (bits_per_pixel == 16) {
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ERR_FAIL_V_MSG(ERR_UNAVAILABLE, "16-bpp BMP images are not supported.");
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}
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// Image data (might be indexed)
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Vector<uint8_t> data;
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int data_len = 0;
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if (bits_per_pixel <= 8) { // indexed
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data_len = width * height;
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} else { // color
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data_len = width * height * 4;
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}
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ERR_FAIL_COND_V_MSG(data_len == 0, ERR_BUG, "Couldn't parse the BMP image data.");
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err = data.resize(data_len);
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uint8_t *data_w = data.ptrw();
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uint8_t *write_buffer = data_w;
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const uint32_t width_bytes = width * bits_per_pixel / 8;
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const uint32_t line_width = (width_bytes + 3) & ~3;
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// The actual data traversal is determined by
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// the data width in case of 8/4/1 bit images
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const uint32_t w = bits_per_pixel >= 24 ? width : width_bytes;
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const uint8_t *line = p_buffer + (line_width * (height - 1));
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const uint8_t *end_buffer = p_buffer + p_header.bmp_file_header.bmp_file_size - p_header.bmp_file_header.bmp_file_offset;
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for (uint64_t i = 0; i < height; i++) {
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const uint8_t *line_ptr = line;
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for (unsigned int j = 0; j < w; j++) {
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ERR_FAIL_COND_V(line_ptr >= end_buffer, ERR_FILE_CORRUPT);
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switch (bits_per_pixel) {
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case 1: {
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uint8_t color_index = *line_ptr;
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write_buffer[index + 0] = (color_index >> 7) & 1;
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write_buffer[index + 1] = (color_index >> 6) & 1;
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write_buffer[index + 2] = (color_index >> 5) & 1;
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write_buffer[index + 3] = (color_index >> 4) & 1;
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write_buffer[index + 4] = (color_index >> 3) & 1;
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write_buffer[index + 5] = (color_index >> 2) & 1;
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write_buffer[index + 6] = (color_index >> 1) & 1;
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write_buffer[index + 7] = (color_index >> 0) & 1;
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index += 8;
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line_ptr += 1;
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} break;
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case 4: {
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uint8_t color_index = *line_ptr;
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write_buffer[index + 0] = (color_index >> 4) & 0x0f;
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write_buffer[index + 1] = color_index & 0x0f;
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index += 2;
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line_ptr += 1;
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} break;
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case 8: {
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uint8_t color_index = *line_ptr;
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write_buffer[index] = color_index;
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index += 1;
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line_ptr += 1;
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} break;
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case 24: {
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write_buffer[index + 2] = line_ptr[0];
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write_buffer[index + 1] = line_ptr[1];
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write_buffer[index + 0] = line_ptr[2];
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write_buffer[index + 3] = 0xff;
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index += 4;
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line_ptr += 3;
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} break;
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case 32: {
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write_buffer[index + 2] = line_ptr[0];
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write_buffer[index + 1] = line_ptr[1];
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write_buffer[index + 0] = line_ptr[2];
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write_buffer[index + 3] = line_ptr[3];
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index += 4;
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line_ptr += 4;
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} break;
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}
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}
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line -= line_width;
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}
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if (p_color_buffer == nullptr || color_table_size == 0) { // regular pixels
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p_image->set_data(width, height, false, Image::FORMAT_RGBA8, data);
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} else { // data is in indexed format, extend it
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// Palette data
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Vector<uint8_t> palette_data;
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palette_data.resize(color_table_size * 4);
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uint8_t *palette_data_w = palette_data.ptrw();
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uint8_t *pal = palette_data_w;
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const uint8_t *cb = p_color_buffer;
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for (unsigned int i = 0; i < color_table_size; ++i) {
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pal[i * 4 + 0] = cb[2];
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pal[i * 4 + 1] = cb[1];
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pal[i * 4 + 2] = cb[0];
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pal[i * 4 + 3] = 0xff;
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cb += 4;
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}
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// Extend palette to image
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Vector<uint8_t> extended_data;
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extended_data.resize(data.size() * 4);
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uint8_t *ex_w = extended_data.ptrw();
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uint8_t *dest = ex_w;
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const int num_pixels = width * height;
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for (int i = 0; i < num_pixels; i++) {
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dest[0] = pal[write_buffer[i] * 4 + 0];
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dest[1] = pal[write_buffer[i] * 4 + 1];
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dest[2] = pal[write_buffer[i] * 4 + 2];
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dest[3] = pal[write_buffer[i] * 4 + 3];
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dest += 4;
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}
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p_image->set_data(width, height, false, Image::FORMAT_RGBA8, extended_data);
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}
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}
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return err;
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}
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Error ImageLoaderBMP::load_image(Ref<Image> p_image, Ref<FileAccess> f, BitField<ImageFormatLoader::LoaderFlags> p_flags, float p_scale) {
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bmp_header_s bmp_header;
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Error err = ERR_INVALID_DATA;
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// A valid bmp file should always at least have a
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// file header and a minimal info header
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if (f->get_length() > BITMAP_FILE_HEADER_SIZE + BITMAP_INFO_HEADER_MIN_SIZE) {
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// File Header
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bmp_header.bmp_file_header.bmp_signature = f->get_16();
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if (bmp_header.bmp_file_header.bmp_signature == BITMAP_SIGNATURE) {
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bmp_header.bmp_file_header.bmp_file_size = f->get_32();
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bmp_header.bmp_file_header.bmp_file_padding = f->get_32();
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bmp_header.bmp_file_header.bmp_file_offset = f->get_32();
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// Info Header
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bmp_header.bmp_info_header.bmp_header_size = f->get_32();
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ERR_FAIL_COND_V_MSG(bmp_header.bmp_info_header.bmp_header_size < BITMAP_INFO_HEADER_MIN_SIZE, ERR_FILE_CORRUPT,
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vformat("Couldn't parse the BMP info header. The file is likely corrupt: %s", f->get_path()));
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bmp_header.bmp_info_header.bmp_width = f->get_32();
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bmp_header.bmp_info_header.bmp_height = f->get_32();
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bmp_header.bmp_info_header.bmp_planes = f->get_16();
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ERR_FAIL_COND_V_MSG(bmp_header.bmp_info_header.bmp_planes != 1, ERR_FILE_CORRUPT,
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vformat("Couldn't parse the BMP planes. The file is likely corrupt: %s", f->get_path()));
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bmp_header.bmp_info_header.bmp_bit_count = f->get_16();
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bmp_header.bmp_info_header.bmp_compression = f->get_32();
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bmp_header.bmp_info_header.bmp_size_image = f->get_32();
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bmp_header.bmp_info_header.bmp_pixels_per_meter_x = f->get_32();
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bmp_header.bmp_info_header.bmp_pixels_per_meter_y = f->get_32();
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bmp_header.bmp_info_header.bmp_colors_used = f->get_32();
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bmp_header.bmp_info_header.bmp_important_colors = f->get_32();
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switch (bmp_header.bmp_info_header.bmp_compression) {
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case BI_RLE8:
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case BI_RLE4:
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case BI_CMYKRLE8:
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case BI_CMYKRLE4: {
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// Stop parsing.
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ERR_FAIL_V_MSG(ERR_UNAVAILABLE,
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vformat("Compressed BMP files are not supported: %s", f->get_path()));
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} break;
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}
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// Don't rely on sizeof(bmp_file_header) as structure padding
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// adds 2 bytes offset leading to misaligned color table reading
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uint32_t ct_offset = BITMAP_FILE_HEADER_SIZE + bmp_header.bmp_info_header.bmp_header_size;
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f->seek(ct_offset);
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uint32_t color_table_size = 0;
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// bmp_colors_used may report 0 despite having a color table
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// for 4 and 1 bit images, so don't rely on this information
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if (bmp_header.bmp_info_header.bmp_bit_count <= 8) {
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// Support 256 colors max
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color_table_size = 1 << bmp_header.bmp_info_header.bmp_bit_count;
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ERR_FAIL_COND_V_MSG(color_table_size == 0, ERR_BUG,
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vformat("Couldn't parse the BMP color table: %s", f->get_path()));
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}
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Vector<uint8_t> bmp_color_table;
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// Color table is usually 4 bytes per color -> [B][G][R][0]
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bmp_color_table.resize(color_table_size * 4);
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uint8_t *bmp_color_table_w = bmp_color_table.ptrw();
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f->get_buffer(bmp_color_table_w, color_table_size * 4);
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f->seek(bmp_header.bmp_file_header.bmp_file_offset);
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uint32_t bmp_buffer_size = (bmp_header.bmp_file_header.bmp_file_size - bmp_header.bmp_file_header.bmp_file_offset);
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Vector<uint8_t> bmp_buffer;
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err = bmp_buffer.resize(bmp_buffer_size);
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if (err == OK) {
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uint8_t *bmp_buffer_w = bmp_buffer.ptrw();
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f->get_buffer(bmp_buffer_w, bmp_buffer_size);
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const uint8_t *bmp_buffer_r = bmp_buffer.ptr();
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const uint8_t *bmp_color_table_r = bmp_color_table.ptr();
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err = convert_to_image(p_image, bmp_buffer_r,
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bmp_color_table_r, color_table_size, bmp_header);
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}
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}
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}
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return err;
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}
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void ImageLoaderBMP::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("bmp");
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}
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static Ref<Image> _bmp_mem_loader_func(const uint8_t *p_bmp, int p_size) {
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Ref<FileAccessMemory> memfile;
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memfile.instantiate();
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Error open_memfile_error = memfile->open_custom(p_bmp, p_size);
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ERR_FAIL_COND_V_MSG(open_memfile_error, Ref<Image>(), "Could not create memfile for BMP image buffer.");
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Ref<Image> img;
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img.instantiate();
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Error load_error = ImageLoaderBMP().load_image(img, memfile, false, 1.0f);
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ERR_FAIL_COND_V_MSG(load_error, Ref<Image>(), "Failed to load BMP image.");
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return img;
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}
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ImageLoaderBMP::ImageLoaderBMP() {
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Image::_bmp_mem_loader_func = _bmp_mem_loader_func;
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}
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