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Re-formatted code by indent
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@tisnik
tisnik committed Sep 22, 2022
1 parent 637ba56 commit 804fa96
Showing 1 changed file with 82 additions and 57 deletions.
139 changes: 82 additions & 57 deletions rpi_framebuffer/rpi_fb6.c
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,8 @@ typedef struct fb_fix_screeninfo ModeInfo;
* (postacuje byt ve skupine 'video' ci pouziti su/sudo)
*/
int readFramebufferInfo(int framebufferDevice,
FramebufferInfo *framebufferInfoPtr,
ModeInfo *modeInfoPtr)
FramebufferInfo * framebufferInfoPtr,
ModeInfo * modeInfoPtr)
{
/* Pokud operace ioctl probehne v poradku, vrati se 0 */
if (ioctl(framebufferDevice, FBIOGET_VSCREENINFO, framebufferInfoPtr)) {
Expand All @@ -59,8 +59,8 @@ int readFramebufferInfo(int framebufferDevice,
* Funkce putpixel platna pro nezname graficke rezimy.
*/
void putpixelNull(const int x, const int y,
const char r, const char g, const char b,
char *pixels, const int line_length)
const char r, const char g, const char b,
char *pixels, const int line_length)
{
}

Expand All @@ -71,18 +71,18 @@ void putpixelNull(const int x, const int y,
* s formatem 8-8-8-8 (popr. muze byt alfa kanal ignorovan).
*/
void putpixelRGBA(const int x, const int y,
const char r, const char g, const char b,
char *pixels, const int line_length)
const char r, const char g, const char b,
char *pixels, const int line_length)
{
/* vypocet adresy zapisu dat */
unsigned int index = (x<<2) + y*line_length;
unsigned int index = (x << 2) + y * line_length;

/* vlastni provedeni zapisu */
*(pixels+index) = b;
*(pixels + index) = b;
index++;
*(pixels+index) = g;
*(pixels + index) = g;
index++;
*(pixels+index) = r;
*(pixels + index) = r;
}


Expand All @@ -104,21 +104,21 @@ void putpixel565(const int x, const int y,
/* vypocet barvy pixelu, v zavorce nejdrive snizime bitovou sirku
* rezervovanou pro jednotlive barvove slozky a posleze bity, ktere
* reprezentuji barvovou slozku posuneme do spravne pozice ve slove */
unsigned int pixel_value = (r >> RED_LOST_BITS) << RED_OFFSET |
(g >> GREEN_LOST_BITS) << GREEN_OFFSET |
(b >> BLUE_LOST_BITS) << BLUE_OFFSET;
unsigned int pixel_value = (r >> RED_LOST_BITS) << RED_OFFSET |
(g >> GREEN_LOST_BITS) << GREEN_OFFSET |
(b >> BLUE_LOST_BITS) << BLUE_OFFSET;

/* prevod na dvojici bajtu */
unsigned char byte1 = pixel_value & 0xff;
unsigned char byte2 = pixel_value >> 8;

/* vypocet adresy zapisu dat */
unsigned int index = (x<<1) + y*line_length;
unsigned int index = (x << 1) + y * line_length;

/* vlastni provedeni zapisu */
*(pixels+index) = byte1;
*(pixels + index) = byte1;
index++;
*(pixels+index) = byte2;
*(pixels + index) = byte2;
}


Expand All @@ -128,22 +128,23 @@ void putpixel565(const int x, const int y,
*/
typedef void (*PutpixelFunction)(const int, const int,
const char, const char, const char,
char*, const int);
char *, const int);



/*
* Funkce, ktera vraci korektni funkci pro operaci putpixel().
*/
PutpixelFunction getProperPutpixelFunction(int bits_per_pixel, int type, int visual)
PutpixelFunction getProperPutpixelFunction(int bits_per_pixel, int type,
int visual)
{
/* umime rozeznat pouze format bez bitovych rovin a bez palety */
if (type == FB_TYPE_PACKED_PIXELS && visual == FB_VISUAL_TRUECOLOR) {
if (bits_per_pixel == 16) {
return putpixel565;
}
if (bits_per_pixel == 32) {
/* toto neni zcela korektni, bylo by nutne rozlisit RGBA, ABGR, ARGB atd.*/
/* toto neni zcela korektni, bylo by nutne rozlisit RGBA, ABGR, ARGB atd. */
/* (ukol pro vazene ctenare :) */
return putpixelRGBA;
}
Expand All @@ -157,8 +158,8 @@ PutpixelFunction getProperPutpixelFunction(int bits_per_pixel, int type, int vis
* Vykresleni testovaciho obrazku s vyuzitim funkce putpixel.
*/
void drawTestImage(int framebufferDevice,
FramebufferInfo *framebufferInfoPtr,
ModeInfo *modeInfoPtr)
FramebufferInfo * framebufferInfoPtr,
ModeInfo * modeInfoPtr)
{
#define OFFSET 300
/* casto pouzivane konstanty */
Expand All @@ -167,15 +168,16 @@ void drawTestImage(int framebufferDevice,
const int yres = framebufferInfoPtr->yres;

/* ziskame spravnou verzi funkce putpixel */
PutpixelFunction putpixel = getProperPutpixelFunction(framebufferInfoPtr->bits_per_pixel,
modeInfoPtr->type,
modeInfoPtr->visual);
PutpixelFunction putpixel =
getProperPutpixelFunction(framebufferInfoPtr->bits_per_pixel,
modeInfoPtr->type,
modeInfoPtr->visual);

/* ziskat primy pristup do framebufferu */
char *pixels = (char*)mmap(0, buffer_length,
PROT_READ | PROT_WRITE,
MAP_SHARED, framebufferDevice,
0);
char *pixels = (char *) mmap(0, buffer_length,
PROT_READ | PROT_WRITE,
MAP_SHARED, framebufferDevice,
0);

if (pixels != MAP_FAILED) {
int x, y;
Expand All @@ -184,57 +186,80 @@ void drawTestImage(int framebufferDevice,
memset(pixels, 0, buffer_length);

/* vykreslime nekolik ctvercu o velikosti 256x256 pixelu */
for (y=0; y<256; y++) {
for (x=0; x<256; x++) {
for (y = 0; y < 256; y++) {
for (x = 0; x < 256; x++) {
/* prvni rada - gradientni prechody */
if (yres > 256) {
/* cerveny gradient */
if (xres > 256) {
r=y; g=0; b=0;
putpixel(x, y, r, g, b, pixels, modeInfoPtr->line_length);
r = y;
g = 0;
b = 0;
putpixel(x, y, r, g, b, pixels,
modeInfoPtr->line_length);
}
/* zeleny gradient */
if (xres > 256 + OFFSET) {
r=0; g=y; b=0;
putpixel(OFFSET+x, y, r, g, b, pixels, modeInfoPtr->line_length);
r = 0;
g = y;
b = 0;
putpixel(OFFSET + x, y, r, g, b, pixels,
modeInfoPtr->line_length);
}
/* modry gradient */
if (xres > 256 + OFFSET*2) {
r=0; g=0; b=y;
putpixel(OFFSET*2+x, y, r, g, b, pixels, modeInfoPtr->line_length);
if (xres > 256 + OFFSET * 2) {
r = 0;
g = 0;
b = y;
putpixel(OFFSET * 2 + x, y, r, g, b, pixels,
modeInfoPtr->line_length);
}
/* grayscale gradient */
if (xres > 256 + OFFSET*3) {
r=y; g=y; b=y;
putpixel(OFFSET*3+x, y, r, g, b, pixels, modeInfoPtr->line_length);
if (xres > 256 + OFFSET * 3) {
r = y;
g = y;
b = y;
putpixel(OFFSET * 3 + x, y, r, g, b, pixels,
modeInfoPtr->line_length);
}
}

/* druha rada - palety */
if (yres > 256 + OFFSET) {
if (xres > 256) {
r=x; g=y; b=0;
putpixel(x, OFFSET+y, r, g, b, pixels, modeInfoPtr->line_length);
r = x;
g = y;
b = 0;
putpixel(x, OFFSET + y, r, g, b, pixels,
modeInfoPtr->line_length);
}
if (xres > 256 + OFFSET) {
r=x; g=y; b=255;
putpixel(OFFSET+x, OFFSET+y, r, g, b, pixels, modeInfoPtr->line_length);
r = x;
g = y;
b = 255;
putpixel(OFFSET + x, OFFSET + y, r, g, b, pixels,
modeInfoPtr->line_length);
}
if (xres > 256 + OFFSET*2) {
r=255; g=x; b=y;
putpixel(OFFSET*2+x, OFFSET+y, r, g, b, pixels, modeInfoPtr->line_length);
if (xres > 256 + OFFSET * 2) {
r = 255;
g = x;
b = y;
putpixel(OFFSET * 2 + x, OFFSET + y, r, g, b,
pixels, modeInfoPtr->line_length);
}
if (xres > 256 + OFFSET*3) {
r=y; g=255; b=x;
putpixel(OFFSET*3+x, OFFSET+y, r, g, b, pixels, modeInfoPtr->line_length);
if (xres > 256 + OFFSET * 3) {
r = y;
g = 255;
b = x;
putpixel(OFFSET * 3 + x, OFFSET + y, r, g, b,
pixels, modeInfoPtr->line_length);
}
}
}
}
getchar();
munmap(pixels, buffer_length);
}
else {
} else {
perror("Nelze pristupovat k framebufferu");
}
}
Expand All @@ -245,23 +270,24 @@ void drawTestImage(int framebufferDevice,
int main(int argc, char **argv)
{
FramebufferInfo framebufferInfo;
ModeInfo modeInfo;
ModeInfo modeInfo;
int framebufferDevice = 0;

/* Ze zarizeni potrebujeme cist i zapisovat.*/
/* Ze zarizeni potrebujeme cist i zapisovat. */
framebufferDevice = open("/dev/fb0", O_RDWR);

/* Pokud otevreni probehlo uspesne, nacteme
* a nasledne vypiseme informaci o framebufferu.*/
if (framebufferDevice != -1) {
/* Precteni informaci o framebufferu a test, zda se vse podarilo */
if (readFramebufferInfo(framebufferDevice, &framebufferInfo, &modeInfo)) {
if (readFramebufferInfo
(framebufferDevice, &framebufferInfo, &modeInfo)) {
drawTestImage(framebufferDevice, &framebufferInfo, &modeInfo);
}
close(framebufferDevice);
return 0;
}
/* Otevreni se nezadarilo, vypiseme tudiz pouze chybove hlaseni.*/
/* Otevreni se nezadarilo, vypiseme tudiz pouze chybove hlaseni. */
else {
perror("Nelze otevrit ovladac /dev/fb0");
return 1;
Expand All @@ -271,4 +297,3 @@ int main(int argc, char **argv)


/* finito */

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