310 lines
11 KiB
C++
310 lines
11 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) 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_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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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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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->create(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->create(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, FileAccess *f,
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bool p_force_linear, 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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f->close();
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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 +
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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 -
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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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f->close();
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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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FileAccessMemory memfile;
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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.instance();
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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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