Guangmin Tang / N5110

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Bitmap.cpp@38:92fad278c2c3, 2017-03-08 (annotated)

Committer:
valavanisalex
Date:
Wed Mar 08 14:12:42 2017 +0000
Revision:
38:92fad278c2c3
Child:
40:c9262294f2e1
Added Bitmap class to simplify sprite support

Who changed what in which revision?

UserRevisionLine numberNew contents of line
valavanisalex 38:92fad278c2c3 1 #include "Bitmap.h"
valavanisalex 38:92fad278c2c3 2
valavanisalex 38:92fad278c2c3 3 #include <iostream>
valavanisalex 38:92fad278c2c3 4
valavanisalex 38:92fad278c2c3 5 Bitmap::Bitmap(std::vector<int> const &contents,
valavanisalex 38:92fad278c2c3 6 unsigned int const height,
valavanisalex 38:92fad278c2c3 7 unsigned int const width)
valavanisalex 38:92fad278c2c3 8 :
valavanisalex 38:92fad278c2c3 9 _contents(contents),
valavanisalex 38:92fad278c2c3 10 _height(height),
valavanisalex 38:92fad278c2c3 11 _width(width)
valavanisalex 38:92fad278c2c3 12 {
valavanisalex 38:92fad278c2c3 13 // Perform a quick sanity check of the dimensions
valavanisalex 38:92fad278c2c3 14 if (contents.size() != height * height) {
valavanisalex 38:92fad278c2c3 15 std::cerr << "Contents of bitmap has size " << contents.size()
valavanisalex 38:92fad278c2c3 16 << " pixels, but its dimensions were specified as "
valavanisalex 38:92fad278c2c3 17 << width << " * " << height << " = " << width * height;
valavanisalex 38:92fad278c2c3 18 }
valavanisalex 38:92fad278c2c3 19 }
valavanisalex 38:92fad278c2c3 20
valavanisalex 38:92fad278c2c3 21 int Bitmap::get_pixel(unsigned int const row,
valavanisalex 38:92fad278c2c3 22 unsigned int const column) const
valavanisalex 38:92fad278c2c3 23 {
valavanisalex 38:92fad278c2c3 24 // First check that row and column indices are within bounds
valavanisalex 38:92fad278c2c3 25 if(column >= _width || row >= _height)
valavanisalex 38:92fad278c2c3 26 {
valavanisalex 38:92fad278c2c3 27 std::cerr << "The requested pixel with index " << row << "," << column
valavanisalex 38:92fad278c2c3 28 << "is outside the bitmap dimensions: " << _width << ","
valavanisalex 38:92fad278c2c3 29 << _height;
valavanisalex 38:92fad278c2c3 30 }
valavanisalex 38:92fad278c2c3 31
valavanisalex 38:92fad278c2c3 32 // Now return the pixel value, using row-major indexing
valavanisalex 38:92fad278c2c3 33 return _contents[row * _width + column];
valavanisalex 38:92fad278c2c3 34 }