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eBookReaderSwitch/platform/x11/x11_image.c

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/*
* Blit RGBA images to X with X(Shm)Images
*/
#ifndef _XOPEN_SOURCE
# define _XOPEN_SOURCE 1
#endif
#ifndef _XOPEN_SOURCE
# define _XOPEN_SOURCE 1
#endif
#define noSHOWINFO
#include "mupdf/fitz.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
extern int ffs(int);
static int is_big_endian(void)
{
static const int one = 1;
return *(char*)&one == 0;
}
typedef void (*ximage_convert_func_t)
(
const unsigned char *src,
int srcstride,
unsigned char *dst,
int dststride,
int w,
int h
);
#define POOLSIZE 4
#define WIDTH 256
#define HEIGHT 256
enum {
ARGB8888,
BGRA8888,
RGBA8888,
ABGR8888,
RGB888,
BGR888,
RGB565,
RGB565_BR,
RGB555,
RGB555_BR,
BGR233,
UNKNOWN
};
#ifdef SHOWINFO
static char *modename[] = {
"ARGB8888",
"BGRA8888",
"RGBA8888",
"ABGR8888",
"RGB888",
"BGR888",
"RGB565",
"RGB565_BR",
"RGB555",
"RGB555_BR",
"BGR233",
"UNKNOWN"
};
#endif
extern ximage_convert_func_t ximage_convert_funcs[];
static struct
{
Display *display;
int screen;
XVisualInfo visual;
Colormap colormap;
int bitsperpixel;
int mode;
XColor rgbcube[256];
ximage_convert_func_t convert_func;
int useshm;
int shmcode;
XImage *pool[POOLSIZE];
/* MUST exist during the lifetime of the shared ximage according to the
xc/doc/hardcopy/Xext/mit-shm.PS.gz */
XShmSegmentInfo shminfo[POOLSIZE];
int lastused;
} info;
static XImage *
createximage(Display *dpy, Visual *vis, XShmSegmentInfo *xsi, int depth, int w, int h)
{
XImage *img;
Status status;
if (!XShmQueryExtension(dpy))
goto fallback;
if (!info.useshm)
goto fallback;
img = XShmCreateImage(dpy, vis, depth, ZPixmap, NULL, xsi, w, h);
if (!img)
{
fprintf(stderr, "warn: could not XShmCreateImage\n");
goto fallback;
}
xsi->shmid = shmget(IPC_PRIVATE,
img->bytes_per_line * img->height,
IPC_CREAT | 0777);
if (xsi->shmid < 0)
{
XDestroyImage(img);
fprintf(stderr, "warn: could not shmget\n");
goto fallback;
}
img->data = xsi->shmaddr = shmat(xsi->shmid, NULL, 0);
if (img->data == (char*)-1)
{
XDestroyImage(img);
fprintf(stderr, "warn: could not shmat\n");
goto fallback;
}
xsi->readOnly = False;
status = XShmAttach(dpy, xsi);
if (!status)
{
shmdt(xsi->shmaddr);
XDestroyImage(img);
fprintf(stderr, "warn: could not XShmAttach\n");
goto fallback;
}
XSync(dpy, False);
shmctl(xsi->shmid, IPC_RMID, NULL);
return img;
fallback:
info.useshm = 0;
img = XCreateImage(dpy, vis, depth, ZPixmap, 0, NULL, w, h, 32, 0);
if (!img)
{
fprintf(stderr, "fail: could not XCreateImage");
abort();
}
img->data = malloc(h * img->bytes_per_line);
if (!img->data)
{
fprintf(stderr, "fail: could not malloc");
abort();
}
return img;
}
static void
make_colormap(void)
{
if (info.visual.class == PseudoColor && info.visual.depth == 8)
{
int i, r, g, b;
i = 0;
for (b = 0; b < 4; b++) {
for (g = 0; g < 8; g++) {
for (r = 0; r < 8; r++) {
info.rgbcube[i].pixel = i;
info.rgbcube[i].red = (r * 36) << 8;
info.rgbcube[i].green = (g * 36) << 8;
info.rgbcube[i].blue = (b * 85) << 8;
info.rgbcube[i].flags =
DoRed | DoGreen | DoBlue;
i++;
}
}
}
info.colormap = XCreateColormap(info.display,
RootWindow(info.display, info.screen),
info.visual.visual,
AllocAll);
XStoreColors(info.display, info.colormap, info.rgbcube, 256);
return;
}
else if (info.visual.class == TrueColor)
{
info.colormap = 0;
return;
}
fprintf(stderr, "Cannot handle visual class %d with depth: %d\n",
info.visual.class, info.visual.depth);
return;
}
static void
select_mode(void)
{
int byteorder;
int byterev;
unsigned long rm, gm, bm;
unsigned long rs, gs, bs;
byteorder = ImageByteOrder(info.display);
if (is_big_endian())
byterev = byteorder != MSBFirst;
else
byterev = byteorder != LSBFirst;
rm = info.visual.red_mask;
gm = info.visual.green_mask;
bm = info.visual.blue_mask;
rs = ffs(rm) - 1;
gs = ffs(gm) - 1;
bs = ffs(bm) - 1;
#ifdef SHOWINFO
printf("ximage: mode %d/%d %08lx %08lx %08lx (%ld,%ld,%ld) %s%s\n",
info.visual.depth,
info.bitsperpixel,
rm, gm, bm, rs, gs, bs,
byteorder == MSBFirst ? "msb" : "lsb",
byterev ? " <swap>":"");
#endif
info.mode = UNKNOWN;
if (info.bitsperpixel == 8) {
/* Either PseudoColor with BGR233 colormap, or TrueColor */
info.mode = BGR233;
}
else if (info.bitsperpixel == 16) {
if (rm == 0xF800 && gm == 0x07E0 && bm == 0x001F)
info.mode = !byterev ? RGB565 : RGB565_BR;
if (rm == 0x7C00 && gm == 0x03E0 && bm == 0x001F)
info.mode = !byterev ? RGB555 : RGB555_BR;
}
else if (info.bitsperpixel == 24) {
if (rs == 0 && gs == 8 && bs == 16)
info.mode = byteorder == MSBFirst ? RGB888 : BGR888;
if (rs == 16 && gs == 8 && bs == 0)
info.mode = byteorder == MSBFirst ? BGR888 : RGB888;
}
else if (info.bitsperpixel == 32) {
if (rs == 0 && gs == 8 && bs == 16)
info.mode = byteorder == MSBFirst ? ABGR8888 : RGBA8888;
if (rs == 8 && gs == 16 && bs == 24)
info.mode = byteorder == MSBFirst ? BGRA8888 : ARGB8888;
if (rs == 16 && gs == 8 && bs == 0)
info.mode = byteorder == MSBFirst ? ARGB8888 : BGRA8888;
if (rs == 24 && gs == 16 && bs == 8)
info.mode = byteorder == MSBFirst ? RGBA8888 : ABGR8888;
}
#ifdef SHOWINFO
printf("ximage: RGBA8888 to %s\n", modename[info.mode]);
#endif
/* select conversion function */
info.convert_func = ximage_convert_funcs[info.mode];
}
static int
create_pool(void)
{
int i;
info.lastused = 0;
for (i = 0; i < POOLSIZE; i++) {
info.pool[i] = NULL;
}
for (i = 0; i < POOLSIZE; i++) {
info.pool[i] = createximage(info.display,
info.visual.visual, &info.shminfo[i], info.visual.depth,
WIDTH, HEIGHT);
if (!info.pool[i]) {
return 0;
}
}
return 1;
}
static XImage *
next_pool_image(void)
{
if (info.lastused + 1 >= POOLSIZE) {
if (info.useshm)
XSync(info.display, False);
else
XFlush(info.display);
info.lastused = 0;
}
return info.pool[info.lastused ++];
}
static int
ximage_error_handler(Display *display, XErrorEvent *event)
{
/* Turn off shared memory images if we get an error from the MIT-SHM extension */
if (event->request_code == info.shmcode)
{
char buf[80];
XGetErrorText(display, event->error_code, buf, sizeof buf);
fprintf(stderr, "ximage: disabling shared memory extension: %s\n", buf);
info.useshm = 0;
return 0;
}
XSetErrorHandler(NULL);
return (XSetErrorHandler(ximage_error_handler))(display, event);
}
int
ximage_init(Display *display, int screen, Visual *visual)
{
XVisualInfo template;
XVisualInfo *visuals;
int nvisuals;
XPixmapFormatValues *formats;
int nformats;
int ok;
int i;
int major;
int event;
int error;
info.display = display;
info.screen = screen;
info.colormap = 0;
/* Get XVisualInfo for this visual */
template.visualid = XVisualIDFromVisual(visual);
visuals = XGetVisualInfo(display, VisualIDMask, &template, &nvisuals);
if (nvisuals != 1) {
fprintf(stderr, "Visual not found!\n");
XFree(visuals);
return 0;
}
memcpy(&info.visual, visuals, sizeof (XVisualInfo));
XFree(visuals);
/* Get appropriate PixmapFormat for this visual */
formats = XListPixmapFormats(info.display, &nformats);
for (i = 0; i < nformats; i++) {
if (formats[i].depth == info.visual.depth) {
info.bitsperpixel = formats[i].bits_per_pixel;
break;
}
}
XFree(formats);
if (i == nformats) {
fprintf(stderr, "PixmapFormat not found!\n");
return 0;
}
/* extract mode */
select_mode();
/* prepare colormap */
make_colormap();
/* identify code for MIT-SHM extension */
if (XQueryExtension(display, "MIT-SHM", &major, &event, &error) &&
XShmQueryExtension(display))
info.shmcode = major;
/* intercept errors looking for SHM code */
XSetErrorHandler(ximage_error_handler);
/* prepare pool of XImages */
info.useshm = 1;
ok = create_pool();
if (!ok)
return 0;
#ifdef SHOWINFO
printf("ximage: %sPutImage\n", info.useshm ? "XShm" : "X");
#endif
return 1;
}
int
ximage_get_depth(void)
{
return info.visual.depth;
}
Visual *
ximage_get_visual(void)
{
return info.visual.visual;
}
Colormap
ximage_get_colormap(void)
{
return info.colormap;
}
void
ximage_blit(Drawable d, GC gc,
int dstx, int dsty,
unsigned char *srcdata,
int srcx, int srcy,
int srcw, int srch,
int srcstride)
{
XImage *image;
int ax, ay;
int w, h;
unsigned char *srcptr;
for (ay = 0; ay < srch; ay += HEIGHT)
{
h = fz_mini(srch - ay, HEIGHT);
for (ax = 0; ax < srcw; ax += WIDTH)
{
w = fz_mini(srcw - ax, WIDTH);
image = next_pool_image();
srcptr = srcdata +
(ay + srcy) * srcstride +
(ax + srcx) * 4;
info.convert_func(srcptr, srcstride,
(unsigned char *) image->data,
image->bytes_per_line, w, h);
if (info.useshm)
{
XShmPutImage(info.display, d, gc, image,
0, 0, dstx + ax, dsty + ay,
w, h, False);
}
else
{
XPutImage(info.display, d, gc, image,
0, 0,
dstx + ax,
dsty + ay,
w, h);
}
}
}
}
/*
* Primitive conversion functions
*/
#ifndef restrict
#ifndef _C99
#ifdef __GNUC__
#define restrict __restrict__
#else
#define restrict
#endif
#endif
#endif
#define PARAMS \
const unsigned char * restrict src, \
int srcstride, \
unsigned char * restrict dst, \
int dststride, \
int w, \
int h
/*
* Convert byte:RGBA8888 to various formats
*/
static void
ximage_convert_argb8888(PARAMS)
{
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x ++) {
dst[x * 4 + 0] = src[x * 4 + 3]; /* a */
dst[x * 4 + 1] = src[x * 4 + 0]; /* r */
dst[x * 4 + 2] = src[x * 4 + 1]; /* g */
dst[x * 4 + 3] = src[x * 4 + 2]; /* b */
}
dst += dststride;
src += srcstride;
}
}
static void
ximage_convert_bgra8888(PARAMS)
{
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dst[x * 4 + 0] = src[x * 4 + 2];
dst[x * 4 + 1] = src[x * 4 + 1];
dst[x * 4 + 2] = src[x * 4 + 0];
dst[x * 4 + 3] = src[x * 4 + 3];
}
dst += dststride;
src += srcstride;
}
}
static void
ximage_convert_abgr8888(PARAMS)
{
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dst[x * 4 + 0] = src[x * 4 + 3];
dst[x * 4 + 1] = src[x * 4 + 2];
dst[x * 4 + 2] = src[x * 4 + 1];
dst[x * 4 + 3] = src[x * 4 + 0];
}
dst += dststride;
src += srcstride;
}
}
static void
ximage_convert_rgba8888(PARAMS)
{
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
((unsigned *)dst)[x] = ((unsigned *)src)[x];
}
dst += dststride;
src += srcstride;
}
}
static void
ximage_convert_bgr888(PARAMS)
{
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dst[3*x + 0] = src[4*x + 2];
dst[3*x + 1] = src[4*x + 1];
dst[3*x + 2] = src[4*x + 0];
}
src += srcstride;
dst += dststride;
}
}
static void
ximage_convert_rgb888(PARAMS)
{
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dst[3*x + 0] = src[4*x + 0];
dst[3*x + 1] = src[4*x + 1];
dst[3*x + 2] = src[4*x + 2];
}
src += srcstride;
dst += dststride;
}
}
static void
ximage_convert_rgb565(PARAMS)
{
unsigned char r, g, b;
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
r = src[4*x + 0];
g = src[4*x + 1];
b = src[4*x + 2];
((unsigned short *)dst)[x] =
((r & 0xF8) << 8) |
((g & 0xFC) << 3) |
(b >> 3);
}
src += srcstride;
dst += dststride;
}
}
static void
ximage_convert_rgb565_br(PARAMS)
{
unsigned char r, g, b;
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
r = src[4*x + 0];
g = src[4*x + 1];
b = src[4*x + 2];
/* final word is:
g4 g3 g2 b7 b6 b5 b4 b3 : r7 r6 r5 r4 r3 g7 g6 g5
*/
((unsigned short *)dst)[x] =
(r & 0xF8) |
((g & 0xE0) >> 5) |
((g & 0x1C) << 11) |
((b & 0xF8) << 5);
}
src += srcstride;
dst += dststride;
}
}
static void
ximage_convert_rgb555(PARAMS)
{
unsigned char r, g, b;
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
r = src[4*x + 0];
g = src[4*x + 1];
b = src[4*x + 2];
((unsigned short *)dst)[x] =
((r & 0xF8) << 7) |
((g & 0xF8) << 2) |
(b >> 3);
}
src += srcstride;
dst += dststride;
}
}
static void
ximage_convert_rgb555_br(PARAMS)
{
unsigned char r, g, b;
int x, y;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
r = src[4*x + 0];
g = src[4*x + 1];
b = src[4*x + 2];
/* final word is:
g5 g4 g3 b7 b6 b5 b4 b3 : 0 r7 r6 r5 r4 r3 g7 g6
*/
((unsigned short *)dst)[x] =
((r & 0xF8) >> 1) |
((g & 0xC0) >> 6) |
((g & 0x38) << 10) |
((b & 0xF8) << 5);
}
src += srcstride;
dst += dststride;
}
}
static void
ximage_convert_bgr233(PARAMS)
{
unsigned char r, g, b;
int x,y;
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
r = src[4*x + 0];
g = src[4*x + 1];
b = src[4*x + 2];
/* format: b7 b6 g7 g6 g5 r7 r6 r5 */
dst[x] = (b&0xC0) | ((g>>2)&0x38) | ((r>>5)&0x7);
}
src += srcstride;
dst += dststride;
}
}
static void
ximage_convert_generic(PARAMS)
{
unsigned long rm, gm, bm, rs, gs, bs, rx, bx, gx;
unsigned long pixel;
unsigned long r, g, b;
int x, y;
rm = info.visual.red_mask;
gm = info.visual.green_mask;
bm = info.visual.blue_mask;
rs = ffs(rm) - 1;
gs = ffs(gm) - 1;
bs = ffs(bm) - 1;
rx = ffs(~(rm >> rs)) - 1;
gx = ffs(~(gm >> gs)) - 1;
bx = ffs(~(bm >> bs)) - 1;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
r = src[4*x + 0];
g = src[4*x + 1];
b = src[4*x + 2];
/* adjust precision */
if (rx < 8) r >>= (8 - rx); else if (rx > 8) r <<= (rx - 8);
if (gx < 8) g >>= (8 - gx); else if (gx > 8) g <<= (gx - 8);
if (bx < 8) b >>= (8 - bx); else if (bx > 8) b <<= (bx - 8);
pixel = (r << rs) | (g << gs) | (b << bs);
if (ImageByteOrder(info.display) == MSBFirst) {
if (info.bitsperpixel > 16) {
dst[4*x + 0] = (pixel >> 24) & 0xFF;
dst[4*x + 1] = (pixel >> 16) & 0xFF;
dst[4*x + 2] = (pixel >> 8) & 0xFF;
dst[4*x + 3] = (pixel) & 0xFF;
} else if (info.bitsperpixel > 8) {
dst[2*x + 0] = (pixel >> 8) & 0xFF;
dst[2*x + 1] = (pixel) & 0xFF;
}
} else {
if (info.bitsperpixel > 16) {
dst[4*x + 0] = (pixel) & 0xFF;
dst[4*x + 1] = (pixel >> 8) & 0xFF;
dst[4*x + 2] = (pixel >> 16) & 0xFF;
dst[4*x + 3] = (pixel >> 24) & 0xFF;
} else if (info.bitsperpixel > 8) {
dst[2*x + 0] = (pixel) & 0xFF;
dst[2*x + 1] = (pixel >> 8) & 0xFF;
}
}
}
src += srcstride;
dst += dststride;
}
}
ximage_convert_func_t ximage_convert_funcs[] = {
ximage_convert_argb8888,
ximage_convert_bgra8888,
ximage_convert_rgba8888,
ximage_convert_abgr8888,
ximage_convert_rgb888,
ximage_convert_bgr888,
ximage_convert_rgb565,
ximage_convert_rgb565_br,
ximage_convert_rgb555,
ximage_convert_rgb555_br,
ximage_convert_bgr233,
ximage_convert_generic
};
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