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Change bitmap signedness to allow conversion to other data types

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Buffered bitmap array should have been type unsigned char not type char
Includes change to manual
In response to (and hopefully fixing) #182 reported by Marcelo Antunes
This commit is contained in:
Robin Stuart 2020-03-29 13:42:33 +01:00
parent e8b56faa11
commit 52214c5a1c
3 changed files with 9 additions and 8 deletions
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2
backend/raster.c
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@ -61,7 +61,7 @@ static void buffer_plot(struct zint_symbol *symbol, char *pixelbuf) {
int fgred, fggrn, fgblu, bgred, bggrn, bgblu;
int row, column, i;
symbol->bitmap = (char *) malloc(symbol->bitmap_width * symbol->bitmap_height * 3);
symbol->bitmap = (unsigned char *) malloc(symbol->bitmap_width * symbol->bitmap_height * 3);
fgred = (16 * ctoi(symbol->fgcolour[0])) + ctoi(symbol->fgcolour[1]);
fggrn = (16 * ctoi(symbol->fgcolour[2])) + ctoi(symbol->fgcolour[3]);

2
backend/zint.h
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@ -125,7 +125,7 @@ extern "C" {
unsigned char encoded_data[200][143];
int row_height[200]; /* Largest symbol is 189 x 189 Han Xin */
char errtxt[100];
char *bitmap;
unsigned char *bitmap;
int bitmap_width;
int bitmap_height;
unsigned int bitmap_byte_length;

11
docs/manual.txt
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@ -749,13 +749,13 @@ the example below where render_pixel() is assumed to be a function for drawing
a pixel on the screen implemented by the external application:
int row, col, i = 0;
unsigned int red, blue, green;
int red, blue, green;
for (row = 0; row < my_symbol->bitmap_height; row++) {
for (column = 0; col < my_symbol->bitmap_width; column++) {
red = my_symbol->bitmap[i];
green = my_symbol->bitmap[i + 1];
blue = my_symbol->bitmap[i + 2];
red = (int) my_symbol->bitmap[i];
green = (int) my_symbol->bitmap[i + 1];
blue = (int) my_symbol->bitmap[i + 2];
render_pixel(row, column, red, green, blue);
i += 3;
}
@ -826,7 +826,8 @@ row_height | array of | Representation of the | (output only)
errtxt | character | Error message in the event | (output only)
| string | that an error ocurred. |
bitmap | pointer to | Pointer to stored bitmap | (output only)
| character | image. |
| unsigned | image. |
| character | |
| array | |
bitmap_width | integer | Width of stored bitmap | (output only)
| | image (in pixels). |