6484da5721
Add some sanity checks according to bmp specification. Read color table and index data within the same scope and then simply extend the color palette. This particular implementation has one limitation: not all 4/1 bit images can be imported as it requires bit unpacking (size dimensions must be a multiple of 8 for 1-bit and 2 (even) for 4-bit images).
299 lines
10 KiB
C++
299 lines
10 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) 2007-2019 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2019 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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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 == NULL)
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err = FAILED;
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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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if (p_header.bmp_info_header.bmp_compression != BI_RGB) {
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err = FAILED;
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}
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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(width % 8 != 0, ERR_UNAVAILABLE);
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ERR_FAIL_COND_V(height % 8 != 0, ERR_UNAVAILABLE);
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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(width % 2 != 0, ERR_UNAVAILABLE);
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ERR_FAIL_COND_V(height % 2 != 0, ERR_UNAVAILABLE);
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} else if (bits_per_pixel == 16) {
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ERR_FAIL_V(ERR_UNAVAILABLE);
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}
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if (err == OK) {
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// Image data (might be indexed)
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PoolVector<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(data_len == 0, ERR_BUG);
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err = data.resize(data_len);
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PoolVector<uint8_t>::Write data_w = data.write();
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uint8_t *write_buffer = data_w.ptr();
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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 (unsigned int 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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uint32_t color = *((uint32_t *)line_ptr);
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write_buffer[index + 2] = color & 0xff;
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write_buffer[index + 1] = (color >> 8) & 0xff;
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write_buffer[index + 0] = (color >> 16) & 0xff;
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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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uint32_t color = *((uint32_t *)line_ptr);
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write_buffer[index + 2] = color & 0xff;
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write_buffer[index + 1] = (color >> 8) & 0xff;
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write_buffer[index + 0] = (color >> 16) & 0xff;
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write_buffer[index + 3] = color >> 24;
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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 == NULL || color_table_size == 0) { // regular pixels
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p_image->create(width, height, 0, 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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PoolVector<uint8_t> palette_data;
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palette_data.resize(color_table_size * 4);
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PoolVector<uint8_t>::Write palette_data_w = palette_data.write();
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uint8_t *pal = palette_data_w.ptr();
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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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uint32_t color = *((uint32_t *)cb);
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pal[i * 4 + 0] = (color >> 16) & 0xff;
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pal[i * 4 + 1] = (color >> 8) & 0xff;
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pal[i * 4 + 2] = (color)&0xff;
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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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PoolVector<uint8_t> extended_data;
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extended_data.resize(data.size() * 4);
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PoolVector<uint8_t>::Write ex_w = extended_data.write();
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uint8_t *dest = ex_w.ptr();
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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, 0, Image::FORMAT_RGBA8, extended_data);
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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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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_len() > 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(bmp_header.bmp_info_header.bmp_header_size < BITMAP_INFO_HEADER_MIN_SIZE, ERR_FILE_CORRUPT);
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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(bmp_header.bmp_info_header.bmp_planes != 1, ERR_FILE_CORRUPT);
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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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// Compressed bitmaps not supported, stop parsing
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if (bmp_header.bmp_info_header.bmp_compression != BI_RGB) {
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ERR_EXPLAIN("Unsupported bmp file: " + f->get_path());
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f->close();
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ERR_FAIL_V(ERR_UNAVAILABLE);
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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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}
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ERR_FAIL_COND_V(color_table_size == 0, ERR_BUG);
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PoolVector<uint8_t> bmp_color_table;
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if (color_table_size > 0) {
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// Color table is usually 4 bytes per color -> [B][G][R][0]
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err = bmp_color_table.resize(color_table_size * 4);
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PoolVector<uint8_t>::Write bmp_color_table_w = bmp_color_table.write();
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f->get_buffer(bmp_color_table_w.ptr(), color_table_size * 4);
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}
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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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PoolVector<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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PoolVector<uint8_t>::Write bmp_buffer_w = bmp_buffer.write();
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f->get_buffer(bmp_buffer_w.ptr(), bmp_buffer_size);
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PoolVector<uint8_t>::Read bmp_buffer_r = bmp_buffer.read();
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PoolVector<uint8_t>::Read bmp_color_table_r = bmp_color_table.read();
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err = convert_to_image(p_image, bmp_buffer_r.ptr(),
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bmp_color_table_r.ptr(), 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(
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List<String> *p_extensions) const {
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p_extensions->push_back("bmp");
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}
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ImageLoaderBMP::ImageLoaderBMP() {}
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