![](/media/cache/group/default_image.jpg.50x50_q85.jpg)
Owen Cavender 201159294
Dependencies: mbed
Diff: Gamepad2/Bitmap.cpp
- Revision:
- 1:897160a1a3ae
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Gamepad2/Bitmap.cpp Tue May 26 12:17:59 2020 +0000 @@ -0,0 +1,96 @@ +#include "Bitmap.h" + +#include <iostream> + +#include "N5110.h" + +Bitmap::Bitmap(int const *contents, + unsigned int const height, + unsigned int const width) + : + _contents(std::vector<int>(height*width)), + _height(height), + _width(width) +{ + // Perform a quick sanity check of the dimensions + if (_contents.size() != height * width) { + std::cerr << "Contents of bitmap has size " << _contents.size() + << " pixels, but its dimensions were specified as " + << width << " * " << height << " = " << width * height << std::endl; + } + + for(unsigned int i = 0; i < height*width; ++i) _contents[i] = contents[i]; +} + +/** + * @returns the value of the pixel at the given position + */ +int Bitmap::get_pixel(unsigned int const row, + unsigned int const column) const +{ + // First check that row and column indices are within bounds + if(column >= _width || row >= _height) + { + std::cerr << "The requested pixel with index " << row << "," << column + << "is outside the bitmap dimensions: " << _width << "," + << _height << std::endl; + } + + // Now return the pixel value, using row-major indexing + return _contents[row * _width + column]; +} + +/** + * @brief Prints the contents of the bitmap to the terminal + */ +void Bitmap::print() const +{ + for (unsigned int row = 0; row < _height; ++row) + { + // Print each element of the row + for (unsigned int column = 0; column < _width; ++column) + { + int pixel = get_pixel(row, column); + std::cout << pixel; + } + + // And then terminate with a new-line character + std::cout << std::endl; + } +} + +/** + * @brief Renders the contents of the bitmap onto an N5110 screen + * + * @param[in] lcd The screen to use for rendering + * @param[in] x0 The horizontal position in pixels at which to render the bitmap + * @param[in] y0 The vertical position in pixels at which to render the bitmap + * + * @details Note that x0, y0 gives the location of the top-left of the bitmap on + * the screen. + * This function only updates the buffer on the screen. You still need + * to refresh the screen in order to actually see the bitmap. + */ +void Bitmap::render(N5110 &lcd, + unsigned int const x0, + unsigned int const y0) const +{ + // Loop through each row of the bitmap image + for (unsigned int bitmap_row = 0; bitmap_row < _height; ++bitmap_row) + { + // Row index on the screen for rendering the row of pixels + unsigned int screen_row = y0 + bitmap_row; + + // Render each pixel in the row + for (unsigned int bitmap_col = 0; bitmap_col < _width; ++bitmap_col) + { + // Column index on the screen for rendering this pixel + int screen_col = x0 + bitmap_col; + + // Find the required value of the pixel at the given location within + // the bitmap data and then write it to the LCD screen + int pixel = get_pixel(bitmap_row, bitmap_col); + lcd.setPixel(screen_col, screen_row, pixel); + } + } +} \ No newline at end of file