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Clarification of bitmap array usage

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Incorporating suggestions by JohnK <john.kamp@globalgraphics.com>
This commit is contained in:
Robin Stuart 2017-04-10 09:06:07 +01:00
parent 1ac5298190
commit 7b4dac7e16
1 changed files with 4 additions and 4 deletions
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docs/manual.txt
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@ -695,20 +695,20 @@ int ZBarcode_Encode_File_and_Buffer(struct zint_symbol *symbol, char *filename,
int rotate_angle); int rotate_angle);
The arguments here are the same as above. The difference is that instead of The arguments here are the same as above. The difference is that instead of
saving the image to file it is placed in a character array. The "bitmap" saving the image to file it is placed in an unsigned integer array. The "bitmap"
pointer is set to the first memory location in the array and the values pointer is set to the first memory location in the array and the values
"barcode_width" and "barcode_height" indicate the size of the resulting image "barcode_width" and "barcode_height" indicate the size of the resulting image
in pixels. Rotation and colour options can be used at the same time as using in pixels. Rotation and colour options can be used at the same time as using
the buffer functions in the same way as when saving to a raster image. The the buffer functions in the same way as when saving to a raster image. The
pixel data can be extracted from the character array by the methd shown in pixel data can be extracted from the array by the methd shown in
the example below where render_pixel() is assumed to be a function for drawing the example below where render_pixel() is assumed to be a function for drawing
a pixel on the screen implemented by the external application: a pixel on the screen implemented by the external application:
int row, col, i = 0; int row, col, i = 0;
int red, blue, green; unsigned int red, blue, green;
for (row = 0; row < my_symbol->bitmap_height; row++) { for (row = 0; row < my_symbol->bitmap_height; row++) {
for (column = 0; column < my_symbol->bitmap_width; column++) { for (column = 0; col < my_symbol->bitmap_width; column++) {
red = my_symbol->bitmap[i]; red = my_symbol->bitmap[i];
green = my_symbol->bitmap[i + 1]; green = my_symbol->bitmap[i + 1];
blue = my_symbol->bitmap[i + 2]; blue = my_symbol->bitmap[i + 2];