Clean up the code doing color parsing and handling. Implement gradients as a bonus feature (not yet exposed)
This commit is contained in:
LemonBoy
parent
392f23ef36
commit
704ba652d9
190
bar.c
190
bar.c
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@ -10,6 +10,7 @@
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#include <unistd.h>
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#include <errno.h>
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#include <xcb/xcb.h>
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#include <xcb/xcbext.h>
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#include <xcb/xinerama.h>
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#include <xcb/randr.h>
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@ -41,6 +42,16 @@ typedef struct area_t {
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char *cmd;
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} area_t;
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typedef union rgba_t {
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struct {
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uint8_t r;
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uint8_t g;
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uint8_t b;
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uint8_t a;
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};
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uint32_t v;
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} rgba_t;
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#define N 20
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typedef struct area_stack_t {
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@ -82,22 +93,89 @@ static bool dock = false;
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static bool topbar = true;
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static int bw = -1, bh = -1, bx = 0, by = 0;
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static int bu = 1; // Underline height
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static uint32_t fgc, bgc, ugc;
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static uint32_t dfgc, dbgc;
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static rgba_t fgc, bgc, ugc;
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static rgba_t dfgc, dbgc;
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static area_stack_t astack;
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void
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update_gc (void)
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{
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xcb_change_gc(c, gc[GC_DRAW], XCB_GC_BACKGROUND | XCB_GC_FOREGROUND, (const uint32_t []){ fgc, bgc });
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xcb_change_gc(c, gc[GC_CLEAR], XCB_GC_FOREGROUND, (const uint32_t []){ bgc });
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xcb_change_gc(c, gc[GC_ATTR], XCB_GC_FOREGROUND, (const uint32_t []){ ugc });
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xcb_change_gc(c, gc[GC_DRAW], XCB_GC_FOREGROUND, (const uint32_t []){ fgc.v });
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xcb_change_gc(c, gc[GC_CLEAR], XCB_GC_FOREGROUND, (const uint32_t []){ bgc.v });
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xcb_change_gc(c, gc[GC_ATTR], XCB_GC_FOREGROUND, (const uint32_t []){ ugc.v });
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}
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void
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fill_rect (xcb_drawable_t d, xcb_gcontext_t gc, int x, int y, int width, int height)
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fill_gradient (xcb_drawable_t d, int x, int y, int width, int height, rgba_t start, rgba_t stop)
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{
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xcb_poly_fill_rectangle(c, d, gc, 1, (const xcb_rectangle_t []){ { x, y, width, height } });
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float i;
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const int K = 25; // The number of steps
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for (i = 0.; i < 1.; i += (1. / K)) {
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// Perform the linear interpolation magic
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unsigned int rr = i * stop.r + (1. - i) * start.r;
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unsigned int gg = i * stop.g + (1. - i) * start.g;
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unsigned int bb = i * stop.b + (1. - i) * start.b;
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// The alpha is ignored here
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rgba_t step = { rr, gg, bb, 0xff };
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xcb_change_gc(c, gc[GC_DRAW], XCB_GC_FOREGROUND, (const uint32_t []){ step.v });
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xcb_poly_fill_rectangle(c, d, gc[GC_DRAW], 1,
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(const xcb_rectangle_t []){ { x, i * bh, width, bh / K + 1 } });
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}
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xcb_change_gc(c, gc[GC_DRAW], XCB_GC_FOREGROUND, (const uint32_t []){ fgc.v });
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}
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void
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fill_rect (xcb_drawable_t d, xcb_gcontext_t _gc, int x, int y, int width, int height)
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{
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xcb_poly_fill_rectangle(c, d, _gc, 1, (const xcb_rectangle_t []){ { x, y, width, height } });
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}
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// Apparently xcb cannot seem to compose the right request for this call, hence we have to do it by
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// ourselves.
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// The funcion is taken from 'wmdia' (http://wmdia.sourceforge.net/)
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xcb_void_cookie_t xcb_poly_text_16_simple(xcb_connection_t * c,
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xcb_drawable_t drawable, xcb_gcontext_t gc, int16_t x, int16_t y,
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uint32_t len, const uint16_t *str)
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{
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static const xcb_protocol_request_t xcb_req = {
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5, // count
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0, // ext
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XCB_POLY_TEXT_16, // opcode
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1 // isvoid
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};
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struct iovec xcb_parts[7];
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uint8_t xcb_lendelta[2];
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xcb_void_cookie_t xcb_ret;
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xcb_poly_text_8_request_t xcb_out;
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xcb_out.pad0 = 0;
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xcb_out.drawable = drawable;
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xcb_out.gc = gc;
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xcb_out.x = x;
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xcb_out.y = y;
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xcb_lendelta[0] = len;
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xcb_lendelta[1] = 0;
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xcb_parts[2].iov_base = (char *)&xcb_out;
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xcb_parts[2].iov_len = sizeof(xcb_out);
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xcb_parts[3].iov_base = 0;
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xcb_parts[3].iov_len = -xcb_parts[2].iov_len & 3;
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xcb_parts[4].iov_base = xcb_lendelta;
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xcb_parts[4].iov_len = sizeof(xcb_lendelta);
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xcb_parts[5].iov_base = (char *)str;
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xcb_parts[5].iov_len = len * sizeof(int16_t);
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xcb_parts[6].iov_base = 0;
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xcb_parts[6].iov_len = -(xcb_parts[4].iov_len + xcb_parts[5].iov_len) & 3;
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xcb_ret.sequence = xcb_send_request(c, 0, xcb_parts + 2, &xcb_req);
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return xcb_ret;
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}
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int
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@ -107,13 +185,17 @@ draw_char (monitor_t *mon, font_t *cur_font, int x, int align, uint16_t ch)
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switch (align) {
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case ALIGN_C:
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xcb_copy_area(c, mon->pixmap, mon->pixmap, gc[GC_DRAW], mon->width / 2 - x / 2, 0,
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mon->width / 2 - (x + ch_width) / 2, 0, x, bh);
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xcb_copy_area(c, mon->pixmap, mon->pixmap, gc[GC_DRAW],
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mon->width / 2 - x / 2, 0,
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mon->width / 2 - (x + ch_width) / 2, 0,
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x, bh);
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x = mon->width / 2 - (x + ch_width) / 2 + x;
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break;
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case ALIGN_R:
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xcb_copy_area(c, mon->pixmap, mon->pixmap, gc[GC_DRAW], mon->width - x, 0,
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mon->width - x - ch_width, 0, x, bh);
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xcb_copy_area(c, mon->pixmap, mon->pixmap, gc[GC_DRAW],
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mon->width - x, 0,
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mon->width - x - ch_width, 0,
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x, bh);
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x = mon->width - ch_width;
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break;
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}
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@ -124,8 +206,10 @@ draw_char (monitor_t *mon, font_t *cur_font, int x, int align, uint16_t ch)
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// xcb accepts string in UCS-2 BE, so swap
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ch = (ch >> 8) | (ch << 8);
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// String baseline coordinates
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xcb_image_text_16(c, 1, mon->pixmap, gc[GC_DRAW], x, bh / 2 + cur_font->height / 2 - cur_font->descent, (xcb_char2b_t *)&ch);
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// The coordinates here are those of the baseline
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xcb_poly_text_16_simple(c, mon->pixmap, gc[GC_DRAW],
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x, bh / 2 + cur_font->height / 2 - cur_font->descent,
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1, &ch);
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// We can render both at the same time
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if (attrs & ATTR_OVERL)
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@ -136,12 +220,12 @@ draw_char (monitor_t *mon, font_t *cur_font, int x, int align, uint16_t ch)
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return ch_width;
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}
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uint32_t
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parse_color (const char *str, char **end, const uint32_t def)
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rgba_t
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parse_color (const char *str, char **end, const rgba_t def)
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{
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xcb_alloc_named_color_reply_t *nc_reply;
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int str_len;
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uint32_t ret;
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size_t string_len;
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rgba_t ret;
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if (!str)
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return def;
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@ -156,47 +240,45 @@ parse_color (const char *str, char **end, const uint32_t def)
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// Hex representation
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if (str[0] == '#') {
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errno = 0;
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uint32_t tmp = strtoul(str + 1, end, 16);
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rgba_t tmp = (rgba_t)(uint32_t)strtoul(str + 1, end, 16);
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// Some error checking is definitely good
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if (errno)
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tmp = def;
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if (errno) {
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fprintf(stderr, "Invalid color specified\n");
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return def;
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}
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// Xorg uses colors with premultiplied alpha
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unsigned int a = (tmp&0xff000000) >> 24;
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unsigned int r = (tmp&0x00ff0000) >> 16;
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unsigned int g = (tmp&0x0000ff00) >> 8;
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unsigned int b = (tmp&0x000000ff);
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// Premultiply the alpha in
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if (tmp.a) {
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// The components are clamped automagically as the rgba_t is made of uint8_t
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return (rgba_t){
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.r = (tmp.r * tmp.a) / 255,
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.g = (tmp.g * tmp.a) / 255,
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.b = (tmp.b * tmp.a) / 255,
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.a = tmp.a,
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};
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}
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if (a) {
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r = (r * a) / 255;
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g = (g * a) / 255;
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b = (b * a) / 255;
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// Clamp on overflow
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if (r > 255) r = 255;
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if (g > 255) g = 255;
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if (b > 255) b = 255;
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} else
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r = g = b = 0;
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return a << 24 | r << 16 | g << 8 | b;
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return (rgba_t)0U;
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}
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// Actual color name, resolve it
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str_len = 0;
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while (isalpha(str[str_len]))
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str_len++;
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for (string_len = 0; isalpha(str[string_len]); string_len++)
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;
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nc_reply = xcb_alloc_named_color_reply(c, xcb_alloc_named_color(c, colormap, str_len, str), NULL);
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nc_reply = xcb_alloc_named_color_reply(c, xcb_alloc_named_color(c, colormap, string_len, str), NULL);
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if (!nc_reply)
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fprintf(stderr, "Could not alloc color \"%.*s\"\n", str_len, str);
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ret = (nc_reply) ? nc_reply->pixel : def;
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fprintf(stderr, "Could not alloc color \"%.*s\"\n", string_len, str);
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ret = nc_reply?
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(rgba_t)nc_reply->pixel:
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def;
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free(nc_reply);
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if (end)
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*end = (char *)str + str_len;
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*end = (char *)str + string_len;
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return ret;
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}
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@ -363,7 +445,7 @@ parse (char *text)
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monitor_t *cur_mon;
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int pos_x, align, button;
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char *p = text, *end;
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uint32_t tmp;
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rgba_t tmp;
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pos_x = 0;
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align = ALIGN_L;
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@ -631,7 +713,7 @@ monitor_new (int x, int y, int width, int height)
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ret->x, ret->y, width, bh, 0,
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XCB_WINDOW_CLASS_INPUT_OUTPUT, visual,
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XCB_CW_BACK_PIXEL | XCB_CW_BORDER_PIXEL | XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK | XCB_CW_COLORMAP,
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(const uint32_t []){ bgc, bgc, dock, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS, colormap });
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(const uint32_t []){ bgc.v, bgc.v, dock, XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_BUTTON_PRESS, colormap });
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ret->pixmap = xcb_generate_id(c);
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xcb_create_pixmap(c, depth, ret->pixmap, ret->window, width, bh);
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@ -1063,13 +1145,13 @@ init (void)
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// Create the gc for drawing
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gc[GC_DRAW] = xcb_generate_id(c);
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xcb_create_gc(c, gc[GC_DRAW], monhead->pixmap, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND, (const uint32_t []){ fgc, bgc });
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xcb_create_gc(c, gc[GC_DRAW], monhead->pixmap, XCB_GC_FOREGROUND, (const uint32_t []){ fgc.v });
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gc[GC_CLEAR] = xcb_generate_id(c);
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xcb_create_gc(c, gc[GC_CLEAR], monhead->pixmap, XCB_GC_FOREGROUND, (const uint32_t []){ bgc });
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xcb_create_gc(c, gc[GC_CLEAR], monhead->pixmap, XCB_GC_FOREGROUND, (const uint32_t []){ bgc.v });
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gc[GC_ATTR] = xcb_generate_id(c);
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xcb_create_gc(c, gc[GC_ATTR], monhead->pixmap, XCB_GC_FOREGROUND, (const uint32_t []){ ugc });
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xcb_create_gc(c, gc[GC_ATTR], monhead->pixmap, XCB_GC_FOREGROUND, (const uint32_t []){ ugc.v });
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// Make the bar visible and clear the pixmap
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for (monitor_t *mon = monhead; mon; mon = mon->next) {
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@ -1143,8 +1225,8 @@ main (int argc, char **argv)
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xconn();
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// B/W combo
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dbgc = bgc = parse_color("black", NULL, scr->black_pixel);
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dfgc = fgc = parse_color("white", NULL, scr->white_pixel);
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dbgc = bgc = parse_color("black", NULL, (rgba_t)scr->black_pixel);
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dfgc = fgc = parse_color("white", NULL, (rgba_t)scr->white_pixel);
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ugc = fgc;
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@ -1169,8 +1251,8 @@ main (int argc, char **argv)
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case 'd': dock = true; break;
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case 'f': parse_font_list(optarg); break;
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case 'u': bu = strtoul(optarg, NULL, 10); break;
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case 'B': dbgc = bgc = parse_color(optarg, NULL, scr->black_pixel); break;
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case 'F': dfgc = fgc = parse_color(optarg, NULL, scr->white_pixel); break;
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case 'B': dbgc = bgc = parse_color(optarg, NULL, (rgba_t)scr->black_pixel); break;
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case 'F': dfgc = fgc = parse_color(optarg, NULL, (rgba_t)scr->white_pixel); break;
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}
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}
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