pgrondek/polybar-dwm
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fix(renderer): Falloff gradient

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Before it did not take into account borders or a tray on the left.
It also sometimes rendered the gradient way to large
This commit is contained in:
patrick96 2019-11-22 03:11:12 +01:00 committed by Patrick Ziegler
parent ec2bad004a
commit 00274c57a9
2 changed files with 29 additions and 14 deletions
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6
include/cairo/context.hpp
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@ -108,10 +108,9 @@ namespace cairo {
}
context& operator<<(const linear_gradient& l) {
if (l.steps.size() >= 2) {
auto stops = l.steps.size();
if (stops >= 2) {
auto pattern = cairo_pattern_create_linear(l.x1, l.y1, l.x2, l.y2);
*this << pattern;
auto stops = l.steps.size();
auto step = 1.0 / (stops - 1);
auto offset = 0.0;
for (auto&& color : l.steps) {
@ -124,6 +123,7 @@ namespace cairo {
// clang-format on
offset += step;
}
*this << pattern;
cairo_pattern_destroy(pattern);
}
return *this;

37
src/components/renderer.cpp
View File

@ -341,7 +341,7 @@ void renderer::flush(alignment a) {
double w = static_cast<int>(block_w(a) + 0.5);
double h = static_cast<int>(block_h(a) + 0.5);
double xw = x + w;
bool fits{xw <= m_rect.x + m_rect.width};
bool fits{xw <= m_rect.width};
m_log.trace("renderer: flush(%i geom=%gx%g+%g+%g, falloff=%i)", static_cast<int>(a), w, h, x, y, !fits);
@ -359,19 +359,34 @@ void renderer::flush(alignment a) {
*m_context << m_blocks[a].pattern;
m_context->paint();
if (!fits) {
// Paint falloff gradient at the end of the visible block
// to indicate that the content expands past the canvas
double fx = w - (xw - m_rect.width);
double fsize = std::max(5.0, std::min(std::abs(fx), 30.0));
m_log.trace("renderer: Drawing falloff (pos=%g, size=%g)", fx, fsize);
*m_context << cairo::linear_gradient{fx - fsize, 0.0, fx, 0.0, {0x00000000, 0xFF000000}};
m_context->paint(0.25);
}
*m_context << cairo::abspos{0.0, 0.0};
m_context->destroy(&m_blocks[a].pattern);
m_context->restore();
if (!fits) {
// Paint falloff gradient at the end of the visible block
// to indicate that the content expands past the canvas
/*
* How many pixels are hidden
*/
double overflow = xw - m_rect.width;
double visible_width = w - overflow;
/*
* Width of the falloff gradient. Depends on how much of the block is hidden
*/
double fsize = std::max(5.0, std::min(std::abs(overflow), 30.0));
m_log.trace("renderer: Drawing falloff (pos=%g, size=%g, overflow=%g)", visible_width - fsize, fsize, overflow);
m_context->save();
*m_context << cairo::translate{(double) m_rect.x, (double) m_rect.y};
*m_context << cairo::abspos{0.0, 0.0};
*m_context << cairo::rect{x + visible_width - fsize, y, fsize, h};
m_context->clip(true);
*m_context << cairo::linear_gradient{x + visible_width - fsize, y, x + visible_width, y, {0x00000000, 0xFF000000}};
m_context->paint(0.25);
m_context->restore();
}
}
/**