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107 lines
1.9 KiB
C++
107 lines
1.9 KiB
C++
#include "BlackBorderDetector.h"
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BlackBorderDetector::BlackBorderDetector()
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{
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// empty
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}
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BlackBorder BlackBorderDetector::process(const RgbImage& image)
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{
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int firstNonBlackPixelTop = -1;
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int firstNonBlackPixelLeft = -1;
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// Find the non-black pixel at the top-half border
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for (unsigned x=0; x<image.width()/2; ++x)
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{
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const RgbColor& color = image(x, 0);
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if (!isBlack(color))
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{
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firstNonBlackPixelTop = x;
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break;
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}
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}
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// Find the non-black pixel at the left-half border
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for (unsigned y=0; y<image.height()/2; ++y)
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{
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const RgbColor& color = image(0, y);
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if (!isBlack(color))
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{
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firstNonBlackPixelLeft = y;
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break;
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}
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}
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// Construct 'unknown' result
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BlackBorder detectedBorder;
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detectedBorder.type = BlackBorder::unknown;
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if (firstNonBlackPixelTop == 0 /*&& firstNonBlackPixelLeft == 0*/)
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{
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// No black border
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// C-?-?-? ...
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// ? +----
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// ? |
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// ? |
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// :
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detectedBorder.type = BlackBorder::none;
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detectedBorder.size = -1;
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}
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else if (firstNonBlackPixelTop < 0)
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{
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if (firstNonBlackPixelLeft < 0)
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{
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// We don't know
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// B-B-B-B ...
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// B +---- ...
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// B |
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// B |
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// :
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detectedBorder.type = BlackBorder::unknown;
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detectedBorder.size = -1;
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}
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else //(firstNonBlackPixelLeft > 0)
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{
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// Border at top of screen
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// B-B-B-B ...
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// B +---- ...
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// C |
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// ? |
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// :
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detectedBorder.type = BlackBorder::horizontal;
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detectedBorder.size = firstNonBlackPixelLeft;
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}
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}
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else // (firstNonBlackPixelTop > 0)
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{
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if (firstNonBlackPixelLeft < 0)
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{
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// Border at left of screen
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// B-B-C-? ...
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// B +---- ...
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// B |
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// B |
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// :
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detectedBorder.type = BlackBorder::vertical;
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detectedBorder.size = firstNonBlackPixelTop;
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}
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else //(firstNonBlackPixelLeft > 0)
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{
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// No black border
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// B-B-C-? ...
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// B +----
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// C |
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// ? |
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// :
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detectedBorder.type = BlackBorder::none;
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detectedBorder.size = -1;
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}
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}
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return detectedBorder;
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}
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