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godot/modules/bmp/image_loader_bmp.cpp
ScorpionInc e74a0eff16 Adds some basic 16BPP BMP Support. 
This commit adds some basic 16bpp support for BMP File Format.

Added support for reading and using of 16 bit mask values from file. All values are scaled to ARGB255 format based on bit depth of source color channel.

Removed warning, it's no longer required as 16 bit with alpha bit(s) are now supported.

Adjusted spacing, added spacing and brackets to make clang static check happy.
2023-04-12 19:27:23 -04:00

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/**************************************************************************/
/* image_loader_bmp.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* 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_bmp.h"
#include "core/io/file_access_memory.h"
static uint8_t get_mask_width(uint16_t mask) {
// Returns number of ones in the binary value of the parameter: mask.
// Uses a Simple pop_count.
uint8_t c = 0u;
for (; mask != 0u; mask &= mask - 1u) {
c++;
}
return c;
}
Error ImageLoaderBMP::convert_to_image(Ref<Image> p_image,
const uint8_t *p_buffer,
const uint8_t *p_color_buffer,
const uint32_t color_table_size,
const bmp_header_s &p_header) {
Error err = OK;
if (p_buffer == nullptr) {
err = FAILED;
}
if (err == OK) {
size_t index = 0;
size_t width = (size_t)p_header.bmp_info_header.bmp_width;
size_t height = (size_t)p_header.bmp_info_header.bmp_height;
size_t bits_per_pixel = (size_t)p_header.bmp_info_header.bmp_bit_count;
// Check whether we can load it
if (bits_per_pixel == 1) {
// Requires bit unpacking...
ERR_FAIL_COND_V_MSG(width % 8 != 0, ERR_UNAVAILABLE,
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)));
ERR_FAIL_COND_V_MSG(height % 8 != 0, ERR_UNAVAILABLE,
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)));
} else if (bits_per_pixel == 2) {
// Requires bit unpacking...
ERR_FAIL_COND_V_MSG(width % 4 != 0, ERR_UNAVAILABLE,
vformat("2-bpp BMP images must have a width that is a multiple of 4, but the imported BMP is %d pixels wide.", int(width)));
ERR_FAIL_COND_V_MSG(height % 4 != 0, ERR_UNAVAILABLE,
vformat("2-bpp BMP images must have a height that is a multiple of 4, but the imported BMP is %d pixels tall.", int(height)));
} else if (bits_per_pixel == 4) {
// Requires bit unpacking...
ERR_FAIL_COND_V_MSG(width % 2 != 0, ERR_UNAVAILABLE,
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)));
ERR_FAIL_COND_V_MSG(height % 2 != 0, ERR_UNAVAILABLE,
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)));
}
// Image data (might be indexed)
Vector<uint8_t> data;
int data_len = 0;
if (bits_per_pixel <= 8) { // indexed
data_len = width * height;
} else { // color
data_len = width * height * 4;
}
ERR_FAIL_COND_V_MSG(data_len == 0, ERR_BUG, "Couldn't parse the BMP image data.");
err = data.resize(data_len);
uint8_t *data_w = data.ptrw();
uint8_t *write_buffer = data_w;
const uint32_t width_bytes = width * bits_per_pixel / 8;
const uint32_t line_width = (width_bytes + 3) & ~3;
// The actual data traversal is determined by
// the data width in case of 8/4/2/1 bit images
const uint32_t w = bits_per_pixel >= 16 ? width : width_bytes;
const uint8_t *line = p_buffer + (line_width * (height - 1));
const uint8_t *end_buffer = p_buffer + p_header.bmp_file_header.bmp_file_size - p_header.bmp_file_header.bmp_file_offset;
for (uint64_t i = 0; i < height; i++) {
const uint8_t *line_ptr = line;
for (unsigned int j = 0; j < w; j++) {
ERR_FAIL_COND_V(line_ptr >= end_buffer, ERR_FILE_CORRUPT);
switch (bits_per_pixel) {
case 1: {
uint8_t color_index = *line_ptr;
write_buffer[index + 0] = (color_index >> 7) & 1;
write_buffer[index + 1] = (color_index >> 6) & 1;
write_buffer[index + 2] = (color_index >> 5) & 1;
write_buffer[index + 3] = (color_index >> 4) & 1;
write_buffer[index + 4] = (color_index >> 3) & 1;
write_buffer[index + 5] = (color_index >> 2) & 1;
write_buffer[index + 6] = (color_index >> 1) & 1;
write_buffer[index + 7] = (color_index >> 0) & 1;
index += 8;
line_ptr += 1;
} break;
case 2: {
uint8_t color_index = *line_ptr;
write_buffer[index + 0] = (color_index >> 6) & 3;
write_buffer[index + 1] = (color_index >> 4) & 3;
write_buffer[index + 2] = (color_index >> 2) & 3;
write_buffer[index + 3] = color_index & 3;
index += 4;
line_ptr += 1;
} break;
case 4: {
uint8_t color_index = *line_ptr;
write_buffer[index + 0] = (color_index >> 4) & 0x0f;
write_buffer[index + 1] = color_index & 0x0f;
index += 2;
line_ptr += 1;
} break;
case 8: {
uint8_t color_index = *line_ptr;
write_buffer[index] = color_index;
index += 1;
line_ptr += 1;
} break;
case 16: {
uint16_t rgb = (static_cast<uint16_t>(line_ptr[1]) << 8) | line_ptr[0];
// A1R5G5B5/X1R5G5B5 => uint16_t
// [A/X]1R5G2 | G3B5 => uint8_t | uint8_t
uint8_t ba = (rgb & p_header.bmp_bitfield.alpha_mask) >> p_header.bmp_bitfield.alpha_offset; // Alpha 0b 1000 ...
uint8_t b0 = (rgb & p_header.bmp_bitfield.red_mask) >> p_header.bmp_bitfield.red_offset; // Red 0b 0111 1100 ...
uint8_t b1 = (rgb & p_header.bmp_bitfield.green_mask) >> p_header.bmp_bitfield.green_offset; // Green 0b 0000 0011 1110 ...
uint8_t b2 = (rgb & p_header.bmp_bitfield.blue_mask); // >> p_header.bmp_bitfield.blue_offset; // Blue 0b ... 0001 1111
// Next we apply some color scaling going from a variable value space to a 256 value space.
// This may be simplified some but left as is for legibility.
// float scaled_value = unscaled_value * byte_max_value / color_channel_maxium_value + rounding_offset;
float f0 = b0 * 255.0f / static_cast<float>(p_header.bmp_bitfield.red_max) + 0.5f;
float f1 = b1 * 255.0f / static_cast<float>(p_header.bmp_bitfield.green_max) + 0.5f;
float f2 = b2 * 255.0f / static_cast<float>(p_header.bmp_bitfield.blue_max) + 0.5f;
write_buffer[index + 0] = static_cast<uint8_t>(f0); // R
write_buffer[index + 1] = static_cast<uint8_t>(f1); // G
write_buffer[index + 2] = static_cast<uint8_t>(f2); // B
if (p_header.bmp_bitfield.alpha_mask_width > 0) {
write_buffer[index + 3] = ba * 0xFF; // Alpha value(Always true or false so no scaling)
} else {
write_buffer[index + 3] = 0xFF; // No Alpha channel, Show everything.
}
index += 4;
line_ptr += 2;
} break;
case 24: {
write_buffer[index + 2] = line_ptr[0];
write_buffer[index + 1] = line_ptr[1];
write_buffer[index + 0] = line_ptr[2];
write_buffer[index + 3] = 0xff;
index += 4;
line_ptr += 3;
} break;
case 32: {
write_buffer[index + 2] = line_ptr[0];
write_buffer[index + 1] = line_ptr[1];
write_buffer[index + 0] = line_ptr[2];
write_buffer[index + 3] = line_ptr[3];
index += 4;
line_ptr += 4;
} break;
}
}
line -= line_width;
}
if (p_color_buffer == nullptr || color_table_size == 0) { // regular pixels
p_image->set_data(width, height, false, Image::FORMAT_RGBA8, data);
} else { // data is in indexed format, extend it
// Palette data
Vector<uint8_t> palette_data;
palette_data.resize(color_table_size * 4);
uint8_t *palette_data_w = palette_data.ptrw();
uint8_t *pal = palette_data_w;
const uint8_t *cb = p_color_buffer;
for (unsigned int i = 0; i < color_table_size; ++i) {
pal[i * 4 + 0] = cb[2];
pal[i * 4 + 1] = cb[1];
pal[i * 4 + 2] = cb[0];
pal[i * 4 + 3] = 0xff;
cb += 4;
}
// Extend palette to image
Vector<uint8_t> extended_data;
extended_data.resize(data.size() * 4);
uint8_t *ex_w = extended_data.ptrw();
uint8_t *dest = ex_w;
const int num_pixels = width * height;
for (int i = 0; i < num_pixels; i++) {
dest[0] = pal[write_buffer[i] * 4 + 0];
dest[1] = pal[write_buffer[i] * 4 + 1];
dest[2] = pal[write_buffer[i] * 4 + 2];
dest[3] = pal[write_buffer[i] * 4 + 3];
dest += 4;
}
p_image->set_data(width, height, false, Image::FORMAT_RGBA8, extended_data);
}
}
return err;
}
Error ImageLoaderBMP::load_image(Ref<Image> p_image, Ref<FileAccess> f, BitField<ImageFormatLoader::LoaderFlags> p_flags, float p_scale) {
bmp_header_s bmp_header;
Error err = ERR_INVALID_DATA;
// A valid bmp file should always at least have a
// file header and a minimal info header
if (f->get_length() > BITMAP_FILE_HEADER_SIZE + BITMAP_INFO_HEADER_MIN_SIZE) {
// File Header
bmp_header.bmp_file_header.bmp_signature = f->get_16();
if (bmp_header.bmp_file_header.bmp_signature == BITMAP_SIGNATURE) {
bmp_header.bmp_file_header.bmp_file_size = f->get_32();
bmp_header.bmp_file_header.bmp_file_padding = f->get_32();
bmp_header.bmp_file_header.bmp_file_offset = f->get_32();
// Info Header
bmp_header.bmp_info_header.bmp_header_size = f->get_32();
ERR_FAIL_COND_V_MSG(bmp_header.bmp_info_header.bmp_header_size < BITMAP_INFO_HEADER_MIN_SIZE, ERR_FILE_CORRUPT,
vformat("Couldn't parse the BMP info header. The file is likely corrupt: %s", f->get_path()));
bmp_header.bmp_info_header.bmp_width = f->get_32();
bmp_header.bmp_info_header.bmp_height = f->get_32();
bmp_header.bmp_info_header.bmp_planes = f->get_16();
ERR_FAIL_COND_V_MSG(bmp_header.bmp_info_header.bmp_planes != 1, ERR_FILE_CORRUPT,
vformat("Couldn't parse the BMP planes. The file is likely corrupt: %s", f->get_path()));
bmp_header.bmp_info_header.bmp_bit_count = f->get_16();
bmp_header.bmp_info_header.bmp_compression = f->get_32();
bmp_header.bmp_info_header.bmp_size_image = f->get_32();
bmp_header.bmp_info_header.bmp_pixels_per_meter_x = f->get_32();
bmp_header.bmp_info_header.bmp_pixels_per_meter_y = f->get_32();
bmp_header.bmp_info_header.bmp_colors_used = f->get_32();
bmp_header.bmp_info_header.bmp_important_colors = f->get_32();
switch (bmp_header.bmp_info_header.bmp_compression) {
case BI_BITFIELDS: {
bmp_header.bmp_bitfield.red_mask = f->get_32();
bmp_header.bmp_bitfield.green_mask = f->get_32();
bmp_header.bmp_bitfield.blue_mask = f->get_32();
bmp_header.bmp_bitfield.alpha_mask = f->get_32();
bmp_header.bmp_bitfield.red_mask_width = get_mask_width(bmp_header.bmp_bitfield.red_mask);
bmp_header.bmp_bitfield.green_mask_width = get_mask_width(bmp_header.bmp_bitfield.green_mask);
bmp_header.bmp_bitfield.blue_mask_width = get_mask_width(bmp_header.bmp_bitfield.blue_mask);
bmp_header.bmp_bitfield.alpha_mask_width = get_mask_width(bmp_header.bmp_bitfield.alpha_mask);
bmp_header.bmp_bitfield.alpha_offset = bmp_header.bmp_bitfield.red_mask_width + bmp_header.bmp_bitfield.green_mask_width + bmp_header.bmp_bitfield.blue_mask_width;
bmp_header.bmp_bitfield.red_offset = bmp_header.bmp_bitfield.green_mask_width + bmp_header.bmp_bitfield.blue_mask_width;
bmp_header.bmp_bitfield.green_offset = bmp_header.bmp_bitfield.blue_mask_width;
bmp_header.bmp_bitfield.red_max = (1 << bmp_header.bmp_bitfield.red_mask_width) - 1;
bmp_header.bmp_bitfield.green_max = (1 << bmp_header.bmp_bitfield.green_mask_width) - 1;
bmp_header.bmp_bitfield.blue_max = (1 << bmp_header.bmp_bitfield.blue_mask_width) - 1;
} break;
case BI_RLE8:
case BI_RLE4:
case BI_CMYKRLE8:
case BI_CMYKRLE4: {
// Stop parsing.
ERR_FAIL_V_MSG(ERR_UNAVAILABLE,
vformat("RLE compressed BMP files are not yet supported: %s", f->get_path()));
} break;
}
// Don't rely on sizeof(bmp_file_header) as structure padding
// adds 2 bytes offset leading to misaligned color table reading
uint32_t ct_offset = BITMAP_FILE_HEADER_SIZE + bmp_header.bmp_info_header.bmp_header_size;
f->seek(ct_offset);
uint32_t color_table_size = 0;
// bmp_colors_used may report 0 despite having a color table
// for 4 and 1 bit images, so don't rely on this information
if (bmp_header.bmp_info_header.bmp_bit_count <= 8) {
// Support 256 colors max
color_table_size = 1 << bmp_header.bmp_info_header.bmp_bit_count;
ERR_FAIL_COND_V_MSG(color_table_size == 0, ERR_BUG,
vformat("Couldn't parse the BMP color table: %s", f->get_path()));
}
Vector<uint8_t> bmp_color_table;
// Color table is usually 4 bytes per color -> [B][G][R][0]
bmp_color_table.resize(color_table_size * 4);
uint8_t *bmp_color_table_w = bmp_color_table.ptrw();
f->get_buffer(bmp_color_table_w, color_table_size * 4);
f->seek(bmp_header.bmp_file_header.bmp_file_offset);
uint32_t bmp_buffer_size = (bmp_header.bmp_file_header.bmp_file_size - bmp_header.bmp_file_header.bmp_file_offset);
Vector<uint8_t> bmp_buffer;
err = bmp_buffer.resize(bmp_buffer_size);
if (err == OK) {
uint8_t *bmp_buffer_w = bmp_buffer.ptrw();
f->get_buffer(bmp_buffer_w, bmp_buffer_size);
const uint8_t *bmp_buffer_r = bmp_buffer.ptr();
const uint8_t *bmp_color_table_r = bmp_color_table.ptr();
err = convert_to_image(p_image, bmp_buffer_r,
bmp_color_table_r, color_table_size, bmp_header);
}
}
}
return err;
}
void ImageLoaderBMP::get_recognized_extensions(List<String> *p_extensions) const {
p_extensions->push_back("bmp");
}
static Ref<Image> _bmp_mem_loader_func(const uint8_t *p_bmp, int p_size) {
Ref<FileAccessMemory> memfile;
memfile.instantiate();
Error open_memfile_error = memfile->open_custom(p_bmp, p_size);
ERR_FAIL_COND_V_MSG(open_memfile_error, Ref<Image>(), "Could not create memfile for BMP image buffer.");
Ref<Image> img;
img.instantiate();
Error load_error = ImageLoaderBMP().load_image(img, memfile, false, 1.0f);
ERR_FAIL_COND_V_MSG(load_error, Ref<Image>(), "Failed to load BMP image.");
return img;
}
ImageLoaderBMP::ImageLoaderBMP() {
Image::_bmp_mem_loader_func = _bmp_mem_loader_func;
}
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