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Make alpha channel available in direct plotting

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This commit is contained in:
Robin Stuart 2020-08-03 07:53:54 +01:00
parent 382a051cb5
commit 42e866c889
2 changed files with 41 additions and 27 deletions
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54
backend/raster.c
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@ -64,22 +64,44 @@ static int buffer_plot(struct zint_symbol *symbol, char *pixelbuf) {
int fgred, fggrn, fgblu, bgred, bggrn, bgblu;
int fgalpha, bgalpha;
int row, column, i;
int plot_alpha = 0;
if (strlen(symbol->fgcolour) > 6) {
fgalpha = (16 * ctoi(symbol->fgcolour[6])) + ctoi(symbol->fgcolour[7]);
plot_alpha = 1;
} else {
fgalpha = 0xff;
}
if (strlen(symbol->bgcolour) > 6) {
bgalpha = (16 * ctoi(symbol->bgcolour[6])) + ctoi(symbol->bgcolour[7]);
plot_alpha = 1;
} else {
bgalpha = 0xff;
}
/* Free any previous bitmap */
if (symbol->bitmap != NULL) {
free(symbol->bitmap);
symbol->bitmap = NULL;
}
if (symbol->alphamap != NULL) {
free(symbol->alphamap);
symbol->alphamap = NULL;
}
symbol->bitmap = (unsigned char *) malloc(symbol->bitmap_width * symbol->bitmap_height * 3);
if (symbol->bitmap == NULL) {
strcpy(symbol->errtxt, "661: Insufficient memory for bitmap buffer");
return ZINT_ERROR_MEMORY;
}
if (plot_alpha) {
symbol->alphamap = (unsigned char *) malloc(symbol->bitmap_width * symbol->bitmap_height);
if (symbol->alphamap == NULL) {
strcpy(symbol->errtxt, "662: Insufficient memory for alphamap buffer");
return ZINT_ERROR_MEMORY;
}
}
fgred = (16 * ctoi(symbol->fgcolour[0])) + ctoi(symbol->fgcolour[1]);
fggrn = (16 * ctoi(symbol->fgcolour[2])) + ctoi(symbol->fgcolour[3]);
@ -88,18 +110,6 @@ static int buffer_plot(struct zint_symbol *symbol, char *pixelbuf) {
bggrn = (16 * ctoi(symbol->bgcolour[2])) + ctoi(symbol->bgcolour[3]);
bgblu = (16 * ctoi(symbol->bgcolour[4])) + ctoi(symbol->bgcolour[5]);
if (strlen(symbol->fgcolour) > 6) {
fgalpha = (16 * ctoi(symbol->fgcolour[6])) + ctoi(symbol->fgcolour[7]);
} else {
fgalpha = 0xff;
}
if (strlen(symbol->bgcolour) > 6) {
bgalpha = (16 * ctoi(symbol->bgcolour[6])) + ctoi(symbol->bgcolour[7]);
} else {
bgalpha = 0xff;
}
for (row = 0; row < symbol->bitmap_height; row++) {
for (column = 0; column < symbol->bitmap_width; column++) {
i = ((row * symbol->bitmap_width) + column) * 3;
@ -108,61 +118,61 @@ static int buffer_plot(struct zint_symbol *symbol, char *pixelbuf) {
symbol->bitmap[i] = 255;
symbol->bitmap[i + 1] = 255;
symbol->bitmap[i + 2] = 255;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case 'C': // Cyan
symbol->bitmap[i] = 0;
symbol->bitmap[i + 1] = 255;
symbol->bitmap[i + 2] = 255;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case 'B': // Blue
symbol->bitmap[i] = 0;
symbol->bitmap[i + 1] = 0;
symbol->bitmap[i + 2] = 255;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case 'M': // Magenta
symbol->bitmap[i] = 255;
symbol->bitmap[i + 1] = 0;
symbol->bitmap[i + 2] = 255;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case 'R': // Red
symbol->bitmap[i] = 255;
symbol->bitmap[i + 1] = 0;
symbol->bitmap[i + 2] = 0;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case 'Y': // Yellow
symbol->bitmap[i] = 255;
symbol->bitmap[i + 1] = 255;
symbol->bitmap[i + 2] = 0;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case 'G': // Green
symbol->bitmap[i] = 0;
symbol->bitmap[i + 1] = 255;
symbol->bitmap[i + 2] = 0;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case 'K': // Black
symbol->bitmap[i] = 0;
symbol->bitmap[i + 1] = 0;
symbol->bitmap[i + 2] = 0;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
case DEFAULT_INK:
symbol->bitmap[i] = fgred;
symbol->bitmap[i + 1] = fggrn;
symbol->bitmap[i + 2] = fgblu;
symbol->alphamap[i / 3] = fgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = fgalpha;
break;
default: // DEFAULT_PAPER
symbol->bitmap[i] = bgred;
symbol->bitmap[i + 1] = bggrn;
symbol->bitmap[i + 2] = bgblu;
symbol->alphamap[i / 3] = bgalpha;
if (plot_alpha) symbol->alphamap[i / 3] = bgalpha;
break;
}
}

4
docs/manual.txt
View File

@ -903,6 +903,10 @@ bitmap_width | integer | Width of stored bitmap | (output only)
| | image (in pixels). |
bitmap_height | integer | Height of stored bitmap | (output only)
| | image (in pixels). |
alphamap | pointer to | Pointer to array | (output only)
| unsigned | representing alpha |
| character | channel (or NULL if no |
| array | alpha channel needed). |
bitmap_byte_length| integer | Size of BMP bitmap data. | (output only)
vector | pointer to | Pointer to vector header | (output only)
| vector | containing pointers to |