271 lines
7.7 KiB
C++
271 lines
7.7 KiB
C++
/*
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* \brief Functor for drawing an icon onto a surface
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* \author Norman Feske
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* \date 2005-10-24
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*/
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/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__SCOUT_GFX__ICON_PAINTER_H_
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#define _INCLUDE__SCOUT_GFX__ICON_PAINTER_H_
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#include <os/texture.h>
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class Icon_painter
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{
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private:
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/*
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* An Icon has the following layout:
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*
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* P1---+--------+----+
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* | cs | hs | cs | top row
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* +----P2-------+----+
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* | | | |
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* | vs | | vs | mid row
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* | | | |
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* +----+--------P3---+
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* | cs | hs | cs | low row
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* +------------------P4
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*
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* cs ... corner slice
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* hs ... horizontal slice
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* vs ... vertical slice
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*/
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/**
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* Copy pixel with alpha
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*/
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template <typename SPT, typename TPT>
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static inline void _transfer_pixel(TPT const &src, int src_a, int alpha, SPT *dst)
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{
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if (src_a) {
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int register a = (src_a * alpha)>>8;
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if (a) *dst = SPT::mix(*dst, src, a);
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}
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}
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/**
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* Draw corner slice
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*/
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template <typename SPT, typename TPT>
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static void _draw_cslice(TPT const *src, unsigned char const *src_a,
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unsigned src_pitch, int alpha, SPT *dst,
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unsigned dst_pitch, int w, int h)
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{
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for (int j = 0; j < h; j++) {
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TPT const *s = src;
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unsigned char const *sa = src_a;
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SPT *d = dst;
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for (int i = 0; i < w; i++, s++, sa++, d++)
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_transfer_pixel(*s, *sa, alpha, d);
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src += src_pitch, src_a += src_pitch, dst += dst_pitch;
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}
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}
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/**
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* Draw horizontal slice
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*/
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template <typename SPT, typename TPT>
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static void _draw_hslice(TPT const *src, unsigned char const *src_a,
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int src_pitch, int alpha, SPT *dst,
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int dst_pitch, int w, int h)
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{
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for (int j = 0; j < h; j++) {
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TPT s = *src;
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int sa = *src_a;
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SPT *d = dst;
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for (int i = 0; i < w; i++, d++)
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_transfer_pixel(s, sa, alpha, d);
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src += src_pitch, src_a += src_pitch, dst += dst_pitch;
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}
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}
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/**
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* Draw vertical slice
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*/
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template <typename SPT, typename TPT>
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static void _draw_vslice(TPT const *src, unsigned char const *src_a,
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int src_pitch, int alpha, SPT *dst,
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int dst_pitch, int w, int h)
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{
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for (int i = 0; i < w; i++) {
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TPT s = *src;
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int sa = *src_a;
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SPT *d = dst;
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for (int j = 0; j < h; j++, d += dst_pitch)
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_transfer_pixel(s, sa, alpha, d);
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src += 1, src_a += 1, dst += 1;
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}
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}
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/**
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* Draw center slice
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*/
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template <typename SPT, typename TPT>
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static void _draw_center(TPT const *src, unsigned char const *src_a,
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int src_pitch, int alpha, SPT *dst,
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int dst_pitch, int w, int h)
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{
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TPT s = *src;
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int sa = *src_a;
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for (int j = 0; j < h; j++, dst += dst_pitch) {
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SPT *d = dst;
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for (int i = 0; i < w; i++, d++)
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_transfer_pixel(s, sa, alpha, d);
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}
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}
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/**
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* Clip rectangle against clipping region
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*
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* The out parameters are the resulting x/y offsets and the
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* visible width and height.
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*
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* \return 1 if rectangle intersects with clipping region,
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* 0 otherwise
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*/
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static inline int _clip(int px1, int py1, int px2, int py2,
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int cx1, int cy1, int cx2, int cy2,
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int *out_x, int *out_y, int *out_w, int *out_h)
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{
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/* determine intersection of rectangle and clipping region */
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int x1 = Genode::max(px1, cx1);
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int y1 = Genode::max(py1, cy1);
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int x2 = Genode::min(px2, cx2);
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int y2 = Genode::min(py2, cy2);
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*out_w = x2 - x1 + 1;
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*out_h = y2 - y1 + 1;
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*out_x = x1 - px1;
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*out_y = y1 - py1;
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return (*out_w > 0) && (*out_h > 0);
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}
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public:
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typedef Genode::Surface_base::Area Area;
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typedef Genode::Surface_base::Rect Rect;
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template <typename SPT, typename TPT>
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static inline void paint(Genode::Surface<SPT> &surface, Rect rect,
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Genode::Texture<TPT> const &icon, unsigned alpha)
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{
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SPT *addr = surface.addr();
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if (!addr || (alpha == 0)) return;
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int const cx1 = surface.clip().x1();
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int const cy1 = surface.clip().y1();
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int const cx2 = surface.clip().x2();
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int const cy2 = surface.clip().y2();
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unsigned const icon_w = icon.size().w(),
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icon_h = icon.size().h();
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/* determine point positions */
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int const x1 = rect.x1();
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int const y1 = rect.y1();
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int const x4 = x1 + rect.w() - 1;
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int const y4 = y1 + rect.h() - 1;
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int const x2 = x1 + icon_w/2;
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int const y2 = y1 + icon_h/2;
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int const x3 = Genode::max(x4 - (int)icon_w/2 + 1, x2);
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int const y3 = Genode::max(y4 - (int)icon_h/2 + 1, y2);
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int const tx1 = 0;
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int const ty1 = 0;
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int const tx4 = icon_w - 1;
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int const ty4 = icon_h - 1;
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int const tx2 = icon_w/2;
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int const ty2 = icon_h/2;
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int const tx3 = Genode::max(tx4 - (int)icon_w/2 + 1, tx2);
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int const ty3 = Genode::max(ty4 - (int)icon_h/2 + 1, ty2);
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TPT const *src = icon.pixel() + icon_w*ty1;
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unsigned char const *src_a = icon.alpha() + icon_w*ty1;
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int dx, dy, w, h;
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/*
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* top row
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*/
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if (_clip(x1, y1, x2 - 1, y2 - 1, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_cslice(src + tx1 + dy*icon_w + dx, src_a + tx1 + dy*icon_w + dx, icon_w, alpha,
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addr + (y1 + dy)*surface.size().w() + x1 + dx, surface.size().w(), w, h);
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if (_clip(x2, y1, x3 - 1, y2 - 1, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_hslice(src + tx2 + dy*icon_w + dx, src_a + tx2 + dy*icon_w + dx, icon_w, alpha,
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addr + (y1 + dy)*surface.size().w() + x2 + dx, surface.size().w(), w, h);
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if (_clip(x3, y1, x4, y2 - 1, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_cslice(src + tx3 + dy*icon_w + dx, src_a + tx3 + dy*icon_w + dx, icon_w, alpha,
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addr + (y1 + dy)*surface.size().w() + x3 + dx, surface.size().w(), w, h);
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/*
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* mid row
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*/
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src = icon.pixel() + icon_w*ty2;
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src_a = icon.alpha() + icon_w*ty2;
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if (_clip(x1, y2, x2 - 1, y3 - 1, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_vslice(src + tx1 + dx, src_a + tx1 + dx, icon_w, alpha,
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addr + (y2 + dy)*surface.size().w() + x1 + dx, surface.size().w(), w, h);
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if (_clip(x2, y2, x3 - 1, y3 - 1, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_center(src + tx2, src_a + tx2, icon_w, alpha,
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addr + (y2 + dy)*surface.size().w() + x2 + dx, surface.size().w(), w, h);
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if (_clip(x3, y2, x4, y3 - 1, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_vslice(src + tx3 + dx, src_a + tx3 + dx, icon_w, alpha,
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addr + (y2 + dy)*surface.size().w() + x3 + dx, surface.size().w(), w, h);
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/*
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* low row
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*/
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src = icon.pixel() + icon_w*ty3;
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src_a = icon.alpha() + icon_w*ty3;
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if (_clip(x1, y3, x2 - 1, y4, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_cslice(src + tx1 + dy*icon_w + dx, src_a + tx1 + dy*icon_w + dx, icon_w, alpha,
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addr + (y3 + dy)*surface.size().w() + x1 + dx, surface.size().w(), w, h);
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if (_clip(x2, y3, x3 - 1, y4, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_hslice(src + tx2 + dy*icon_w + dx, src_a + tx2 + dy*icon_w + dx, icon_w, alpha,
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addr + (y3 + dy)*surface.size().w() + x2 + dx, surface.size().w(), w, h);
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if (_clip(x3, y3, x4, y4, cx1, cy1, cx2, cy2, &dx, &dy, &w, &h))
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_draw_cslice(src + tx3 + dy*icon_w + dx, src_a + tx3 + dy*icon_w + dx, icon_w, alpha,
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addr + (y3 + dy)*surface.size().w() + x3 + dx, surface.size().w(), w, h);
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}
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};
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#endif /* _INCLUDE__SCOUT_GFX__ICON_PAINTER_H_ */
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