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Add alpha channel support and --nobackground option

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Alpha channel for PNG and SVG and option to remove background from EMF
This commit is contained in:
Robin Stuart 2020-08-02 22:26:39 +01:00
parent 18e3b41e0f
commit 47cac63e7f
9 changed files with 195 additions and 72 deletions
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64
backend/svg.c
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@ -121,6 +121,10 @@ INTERNAL int svg_plot(struct zint_symbol *symbol) {
float ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy;
float radius;
int i;
char fgcolour_string[7];
char bgcolour_string[7];
int bg_alpha = 0xff;
int fg_alpha = 0xff;
struct zint_vector_rect *rect;
struct zint_vector_hexagon *hex;
@ -133,6 +137,20 @@ INTERNAL int svg_plot(struct zint_symbol *symbol) {
char* html_string;
#endif
for (i = 0; i < 6; i++) {
fgcolour_string[i] = symbol->fgcolour[i];
bgcolour_string[i] = symbol->bgcolour[i];
}
fgcolour_string[6] = '\0';
bgcolour_string[6] = '\0';
if (strlen(symbol->fgcolour) > 6) {
fg_alpha = (16 * ctoi(symbol->fgcolour[6])) + ctoi(symbol->fgcolour[7]);
}
if (strlen(symbol->bgcolour) > 6) {
bg_alpha = (16 * ctoi(symbol->bgcolour[6])) + ctoi(symbol->bgcolour[7]);
}
int html_len = strlen((char *)symbol->text) + 1;
for (i = 0; i < (int) strlen((char *)symbol->text); i++) {
@ -178,18 +196,27 @@ INTERNAL int svg_plot(struct zint_symbol *symbol) {
fprintf(fsvg, " xmlns=\"http://www.w3.org/2000/svg\">\n");
fprintf(fsvg, " <desc>Zint Generated Symbol\n");
fprintf(fsvg, " </desc>\n");
fprintf(fsvg, "\n <g id=\"barcode\" fill=\"#%s\">\n", symbol->fgcolour);
fprintf(fsvg, "\n <g id=\"barcode\" fill=\"#%s\">\n", fgcolour_string);
fprintf(fsvg, " <rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" fill=\"#%s\" />\n", (int) ceil(symbol->vector->width), (int) ceil(symbol->vector->height), symbol->bgcolour);
if (bg_alpha != 0) {
fprintf(fsvg, " <rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" fill=\"#%s\"", (int) ceil(symbol->vector->width), (int) ceil(symbol->vector->height), bgcolour_string);
if (bg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", (float) bg_alpha / 255.0);
}
fprintf(fsvg, " />\n");
}
rect = symbol->vector->rectangles;
while (rect) {
if (rect->colour == -1) {
fprintf(fsvg, " <rect x=\"%.2f\" y=\"%.2f\" width=\"%.2f\" height=\"%.2f\" />\n", rect->x, rect->y, rect->width, rect->height);
} else {
fprintf(fsvg, " <rect x=\"%.2f\" y=\"%.2f\" width=\"%.2f\" height=\"%.2f\"", rect->x, rect->y, rect->width, rect->height);
if (rect->colour != -1) {
pick_colour(rect->colour, colour_code);
fprintf(fsvg, " <rect x=\"%.2f\" y=\"%.2f\" width=\"%.2f\" height=\"%.2f\" fill=\"#%s\" />\n", rect->x, rect->y, rect->width, rect->height, colour_code);
fprintf(fsvg, " fill=\"#%s\"", colour_code);
}
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", (float) fg_alpha / 255.0);
}
fprintf(fsvg, " />\n");
rect = rect->next;
}
@ -208,24 +235,41 @@ INTERNAL int svg_plot(struct zint_symbol *symbol) {
dx = hex->x;
ex = hex->x - (0.86 * radius);
fx = hex->x - (0.86 * radius);
fprintf(fsvg, " <path d=\"M %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f Z\" />\n", ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy);
fprintf(fsvg, " <path d=\"M %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f Z\"", ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy);
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", (float) fg_alpha / 255.0);
}
fprintf(fsvg, " />\n");
hex = hex->next;
}
circle = symbol->vector->circles;
while (circle) {
fprintf(fsvg, " <circle cx=\"%.2f\" cy=\"%.2f\" r=\"%.2f\"", circle->x, circle->y, circle->diameter / 2.0);
if (circle->colour) {
fprintf(fsvg, " <circle cx=\"%.2f\" cy=\"%.2f\" r=\"%.2f\" fill=\"#%s\" />\n", circle->x, circle->y, circle->diameter / 2.0, symbol->bgcolour);
fprintf(fsvg, " fill=\"#%s\"", bgcolour_string);
if (bg_alpha != 0xff) {
// This doesn't work how the user is likely to expect - more work needed!
fprintf(fsvg, " opacity=\"%.3f\"", (float) bg_alpha / 255.0);
}
} else {
fprintf(fsvg, " <circle cx=\"%.2f\" cy=\"%.2f\" r=\"%.2f\" fill=\"#%s\" />\n", circle->x, circle->y, circle->diameter / 2.0, symbol->fgcolour);
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", (float) fg_alpha / 255.0);
}
}
fprintf(fsvg, " />\n");
circle = circle->next;
}
string = symbol->vector->strings;
while (string) {
fprintf(fsvg, " <text x=\"%.2f\" y=\"%.2f\" text-anchor=\"middle\"\n", string->x, string->y);
fprintf(fsvg, " font-family=\"Helvetica\" font-size=\"%.1f\" fill=\"#%s\" >\n", string->fsize, symbol->fgcolour);
fprintf(fsvg, " font-family=\"Helvetica\" font-size=\"%.1f\"", string->fsize);
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", (float) fg_alpha / 255.0);
}
fprintf(fsvg, " >\n");
make_html_friendly(string->text, html_string);
fprintf(fsvg, " %s\n", html_string);
fprintf(fsvg, " </text>\n");