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‎LICENSE

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The MIT License (MIT)
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Copyright (c) 2013 Andrew Duncan
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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‎Makefile

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TARGETS= life \
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pngview \
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rgb_triangle \
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sprite \
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test_pattern \
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worms
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default :all
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all:
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for target in $(TARGETS); do (make -C $$target); done
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clean:
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for target in $(TARGETS); do (make -C $$target clean); done
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‎README.md

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Dispmanx
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========
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There are a number of APIs available for the Raspberry Pi that can make use
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of the computers GPU. These include OpenMAX, Open GL ES(1 and 2) and OpenVG.
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The has short examples for theses and other APIs. They can be found in
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/opt/vc/src/hello_pi/. Among these examples is a program called
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hello_dispmanx. It is a very small example of the Dispmanx windowing
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system. Apart from this:-
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https://github.com/raspberrypi/firmware/tree/master/opt/vc/src/hello_pi/hello_dispmanx
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example, there is very little documentation available for this API.
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Hopefully these programs can be used as a starting point.
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test_pattern
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------------
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This test pattern should be familiar to anyone who has used the Raspberry
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Pi. It is the same four colour squar displayed when the Raspberry Pi boots.
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rgb_triangle
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------------
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Displays a triangle in a layer with red, green and blue gradients starting
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at each corner respectively. Blends to grey in the center.
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life
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----
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Conway's game of life.
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worms
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-----
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The program raspiworms uses a single 16 or 32 bit RGBA layer to display a
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number of coloured worms on the screen of the Raspberry Pi.
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pngview
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-------
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Load a png image file and display it as a Dispmanx layer.
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sprite
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------
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Demonstrates a seamless background image that can be scolled in any
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direction. As well as animated sprites.
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common
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------
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Code that may be common to some of the demonstation programs is in this
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folder.
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building
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--------
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If you type make in the top level directory, the make file will build all
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the different programs in this repository. Each program has it's own make
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file, so you can build them individually if you wish.
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‎common/README.md

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common
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======
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‎common/element_change.h

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//-------------------------------------------------------------------------
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// flags for vc_dispmanx_element_change_attributes
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//
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// can be found in interface/vmcs_host/vc_vchi_dispmanx.h
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// but you can't include that file as
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// interface/peer/vc_vchi_dispmanx_common.h is missing.
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//
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//-------------------------------------------------------------------------
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#ifndef ELEMENT_CHANGE_H
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#define ELEMENT_CHANGE_H
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#ifndef ELEMENT_CHANGE_LAYER
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#define ELEMENT_CHANGE_LAYER (1<<0)
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#endif
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#ifndef ELEMENT_CHANGE_OPACITY
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#define ELEMENT_CHANGE_OPACITY (1<<1)
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#endif
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#ifndef ELEMENT_CHANGE_DEST_RECT
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#define ELEMENT_CHANGE_DEST_RECT (1<<2)
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#endif
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#ifndef ELEMENT_CHANGE_SRC_RECT
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#define ELEMENT_CHANGE_SRC_RECT (1<<3)
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#endif
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#ifndef ELEMENT_CHANGE_MASK_RESOURCE
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#define ELEMENT_CHANGE_MASK_RESOURCE (1<<4)
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#endif
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#ifndef ELEMENT_CHANGE_TRANSFORM
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#define ELEMENT_CHANGE_TRANSFORM (1<<5)
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#endif
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#endif

‎common/hsv2rgb.c

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//-------------------------------------------------------------------------
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//
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// The MIT License (MIT)
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//
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// Copyright (c) 2013 Andrew Duncan
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-------------------------------------------------------------------------
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "hsv2rgb.h"
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#include "image.h"
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//-------------------------------------------------------------------------
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void
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hsv2rgb(
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int16_t hue,
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int16_t saturation,
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int16_t value,
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RGBA8_T *rgb)
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{
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//---------------------------------------------------------------------
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// convert hue, saturation and value (HSV) to red, green and blue.
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//
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// hue = 0 to 3600 (i.e. 1/10 of a degree).
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// saturation = 0 to 1000
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// value = 0 to 1000
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//---------------------------------------------------------------------
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rgb->red = 0;
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rgb->green = 0;
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rgb->blue = 0;
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if (saturation == 0)
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{
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rgb->red = (uint8_t)((255 * value) / 1000);
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rgb->green = rgb->red;
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rgb->blue = rgb->red;
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}
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else
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{
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int16_t h = hue/600;
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int16_t f = ((hue%600)*1000)/600;
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int16_t p = (value*(1000-saturation))/1000;
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int16_t q = (value*(1000-((saturation*f)/1000)))/1000;
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int16_t t = (value*(1000-((saturation*(1000-f))/1000)))/1000;
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switch (h)
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{
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case 0:
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rgb->red = (uint8_t)((255 * value) / 1000);
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rgb->green = (uint8_t)((255 * t) / 1000);
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rgb->blue = (uint8_t)((255 * p) / 1000);
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break;
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case 1:
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rgb->red = (uint8_t)((255 * q) / 1000);
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rgb->green = (uint8_t)((255 * value) / 1000);
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rgb->blue = (uint8_t)((255 * p) / 1000);
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break;
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case 2:
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rgb->red = (uint8_t)((255 * p) / 1000);
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rgb->green = (uint8_t)((255 * value) / 1000);
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rgb->blue = (uint8_t)((255 * t) / 1000);
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break;
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case 3:
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rgb->red = (uint8_t)((255 * p) / 1000);
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rgb->green = (uint8_t)((255 * q) / 1000);
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rgb->blue = (uint8_t)((255 * value) / 1000);
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break;
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case 4:
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rgb->red = (uint8_t)((255 * t) / 1000);
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rgb->green = (uint8_t)((255 * p) / 1000);
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rgb->blue = (uint8_t)((255 * value) / 1000);
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break;
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case 5:
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rgb->red = (uint8_t)((255 * value) / 1000);
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rgb->green = (uint8_t)((255 * p) / 1000);
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rgb->blue = (uint8_t)((255 * q) / 1000);
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break;
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}
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}
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}
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‎common/hsv2rgb.h

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//-------------------------------------------------------------------------
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//
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// The MIT License (MIT)
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//
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// Copyright (c) 2013 Andrew Duncan
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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//-------------------------------------------------------------------------
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#ifndef HSV2RGB_H
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#define HSV2RGB_H
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//-------------------------------------------------------------------------
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#include "image.h"
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//-------------------------------------------------------------------------
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void hsv2rgb(int16_t hue, int16_t saturation, int16_t value, RGBA8_T *rgb);
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//-------------------------------------------------------------------------
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#endif

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