Bitmap generator (bitmap as in BMP image, not bitmap bitset)
require 'bmp'
# (soon)
Command Line
gem install bmp-ruby
Gemfile
gem "bmp-ruby", "~>0.1"
(soon)
Adapted from: https://en.wikipedia.org/wiki/BMP_file_format
| Attribute | Hex Offset | Dec Offset | Size | Hex Value | Value | Description |
|---|---|---|---|---|---|---|
| BMP Header | ||||||
| signature | 0h | 0 | 2 | 42 4D | "BM" | ID field (42h, 4Dh) |
| file_size | 2h | 2 | 4 | 9A 00 00 00 | 154 bytes (122+32) | Size of the BMP file |
| reserved_1 | 6h | 6 | 2 | 00 00 | Unused | Application specific |
| reserved_2 | 8h | 8 | 2 | 00 00 | Unused | Application specific |
| file_offset | Ah | 10 | 4 | 7A 00 00 00 | 122 bytes (14+108). | Offset where the pixel array (bitmap data) can be found |
| DIB Header | ||||||
| dib_header_size | Eh | 14 | 4 | 6C 00 00 00 | 108 bytes | Number of bytes in the DIB header (from this point) |
| image_width | 12h | 18 | 4 | 04 00 00 00 | 4 pixels | (left to right order) Width of the bitmap in pixels |
| image_height | 16h | 22 | 4 | 02 00 00 00 | 2 pixels | (bottom to top order) Height of the bitmap in pixels |
| planes | 1Ah | 26 | 2 | 01 00 | 1 plane | Number of color planes being used |
| bits_per_pixel | 1Ch | 28 | 2 | 20 00 | 32 bits | Number of bits per pixel |
| compression | 1Eh | 30 | 4 | 03 00 00 00 | 3 | BI_BITFIELDS, no pixel array compression used |
| image_size | 22h | 34 | 4 | 20 00 00 00 | 32 bytes | Size of the raw bitmap data (including padding) |
| x_pixels_per_meter | 26h | 38 | 4 | 13 0B 00 00 | 2835 px/meter horiz. | Print resolution of the image, 72 DPI × 39.3701 inches per meter yields 2834.6472 |
| y_pixels_per_meter | 2Ah | 42 | 4 | 13 0B 00 00 | 2835 px/meter vertical | Print resolution of the image, 72 DPI × 39.3701 inches per meter yields 2834.6472 |
| number_of_colors | 2Eh | 46 | 4 | 00 00 00 00 | 0 colors | Number of colors in the palette |
| important_colors | 32h | 50 | 4 | 00 00 00 00 | 0 important colors | 0 means all colors are important |
| red_channel_bitmask | 36h | 54 | 4 | 00 00 FF 00 | 00FF0000 in big-endian | Red channel bit mask (valid because BI_BITFIELDS is specified) |
| green_channel_bitmask | 3Ah | 58 | 4 | 00 FF 00 00 | 0000FF00 in big-endian | Green channel bit mask (valid because BI_BITFIELDS is specified) |
| blue_channel_bitmask | 3Eh | 62 | 4 | FF 00 00 00 | 000000FF in big-endian | Blue channel bit mask (valid because BI_BITFIELDS is specified) |
| alpha_channel_bitmask | 42h | 66 | 4 | 00 00 00 FF | FF000000 in big-endian | Alpha channel bit mask |
| color_space_type | 46h | 70 | 4 | 20 6E 69 57 | little-endian "Win " | LCS_WINDOWS_COLOR_SPACE |
| color_space_endpoints | 4Ah | 74 | 36 | 00 00 00 00\n00 00 00 00\n00 00 00 00\n00 00 00 00\n00 00 00 00\n00 00 00 00\n00 00 00 00\n00 00 00 00 | CIEXYZTRIPLE Color Space endpoints | Unused for LCS "Win " or "sRGB" |
| red_gamma | 6Eh | 110 | 4 | 00 00 00 00 | 0 Red Gamma | Unused for LCS "Win " or "sRGB" |
| green_gamma | 72h | 114 | 4 | 00 00 00 00 | 0 Green Gamma | Unused for LCS "Win " or "sRGB" |
| blue_gamma | 76h | 118 | 4 | 00 00 00 00 | 0 Blue Gamma | Unused for LCS "Win " or "sRGB" |
- hoe gem manager
- hoe-bundler may need
gem install hoe-bundlerinstallation before usingrake bundler:gemfile - YARD docs
- redcarpet for yardoc
Tests written with minitest
rake test
Send tested code. Thank you, contributors!
- (soon)
MIT License
Copyright (c) 2017 Bordee Inc.
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.
BMP is maintained and funded by Bordee Inc. The names and logos for Bordee are trademarks of Bordee Inc.
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