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saschbe
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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#ifndef DARK_IMAGE_RENDERING_H
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#define DARK_IMAGE_RENDERING_H
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#include <QPainter>
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#include <QPixmap>
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#include <functional>
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namespace DarkImageRendering {
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// View-local raster composition boundary. Qt still paints the scene in
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// its native order, with its own transforms, clipping and opacity.
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// A different painter (printing, export, another view or an item cache)
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// cannot consume this display-only context.
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struct Context {
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QPainter *painter;
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bool invertScene;
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std::function<void(bool, const QRect &)> flush;
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};
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inline thread_local Context *current = nullptr;
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class Scope {
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Context *previous;
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public:
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explicit Scope(Context *context) : previous(current) { current = context; }
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~Scope() { current = previous; }
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Scope(const Scope &) = delete;
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Scope &operator=(const Scope &) = delete;
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};
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inline void paintPixmap(QPainter *painter, const QPixmap &pixmap, bool adapt)
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{
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Context *context = current;
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const bool boundary = context && context->painter == painter && adapt != context->invertScene;
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if (boundary) context->flush(context->invertScene, QRect());
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painter->drawPixmap(pixmap.rect(), pixmap);
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if (boundary) {
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// Only the raster was drawn since the preceding flush. Avoid a
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// whole-viewport copy for a small logo; include filtering/AA edges.
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const QRect area = painter->worldTransform().mapRect(QRectF(pixmap.rect())).toAlignedRect().adjusted(-2,-2,2,2);
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context->flush(adapt, area);
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}
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}
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}
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#endif
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