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Let MuPDF render a single page of a PDF document

This commit is contained in:
Norman Feske 2012-01-09 22:24:42 +01:00
parent 8201075671
commit 810654f45b
1 changed files with 102 additions and 9 deletions
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111
libports/src/app/mupdf/main.cc
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@ -99,33 +99,103 @@ void winresize(pdfapp_t *app, int w, int h)
}
/***************
** Dithering **
***************/
/*
* XXX blatantly copied from 'demo/src/app/backdrop/main.cc'
*
* We should factor-out the dithering support into a separate header file.
* But where is a good place to put it?
*/
enum { DITHER_SIZE = 16, DITHER_MASK = DITHER_SIZE - 1 };
static const int dither_matrix[DITHER_SIZE][DITHER_SIZE] = {
{ 0,192, 48,240, 12,204, 60,252, 3,195, 51,243, 15,207, 63,255 },
{ 128, 64,176,112,140, 76,188,124,131, 67,179,115,143, 79,191,127 },
{ 32,224, 16,208, 44,236, 28,220, 35,227, 19,211, 47,239, 31,223 },
{ 160, 96,144, 80,172,108,156, 92,163, 99,147, 83,175,111,159, 95 },
{ 8,200, 56,248, 4,196, 52,244, 11,203, 59,251, 7,199, 55,247 },
{ 136, 72,184,120,132, 68,180,116,139, 75,187,123,135, 71,183,119 },
{ 40,232, 24,216, 36,228, 20,212, 43,235, 27,219, 39,231, 23,215 },
{ 168,104,152, 88,164,100,148, 84,171,107,155, 91,167,103,151, 87 },
{ 2,194, 50,242, 14,206, 62,254, 1,193, 49,241, 13,205, 61,253 },
{ 130, 66,178,114,142, 78,190,126,129, 65,177,113,141, 77,189,125 },
{ 34,226, 18,210, 46,238, 30,222, 33,225, 17,209, 45,237, 29,221 },
{ 162, 98,146, 82,174,110,158, 94,161, 97,145, 81,173,109,157, 93 },
{ 10,202, 58,250, 6,198, 54,246, 9,201, 57,249, 5,197, 53,245 },
{ 138, 74,186,122,134, 70,182,118,137, 73,185,121,133, 69,181,117 },
{ 42,234, 26,218, 38,230, 22,214, 41,233, 25,217, 37,229, 21,213 },
{ 170,106,154, 90,166,102,150, 86,169,105,153, 89,165,101,149, 85 }
};
static inline uint16_t rgb565(int r, int g, int b)
{
enum {
R_MASK = 0xf800, R_LSHIFT = 8,
G_MASK = 0x07e0, G_LSHIFT = 3,
B_MASK = 0x001f, B_RSHIFT = 3
};
return ((r << R_LSHIFT) & R_MASK)
| ((g << G_LSHIFT) & G_MASK)
| ((b >> B_RSHIFT) & B_MASK);
}
static void convert_line_rgba_to_rgb565(const unsigned char *rgba_src,
uint16_t *dst, int num_pixels, int line)
{
using namespace Genode;
enum { CHANNEL_MAX = 255 };
int const *dm = dither_matrix[line & DITHER_MASK];
for (int i = 0; i < num_pixels; i++) {
int v = dm[i & DITHER_MASK] >> 5;
*dst++ = rgb565(min(v + (int)rgba_src[0], (int)CHANNEL_MAX),
min(v + (int)rgba_src[1], (int)CHANNEL_MAX),
min(v + (int)rgba_src[2], (int)CHANNEL_MAX));
/* we ignore the alpha channel */
rgba_src += 4; /* next pixel */
}
}
/******************
** Main program **
******************/
int main(int, char **)
{
static Framebuffer::Connection framebuffer;
Framebuffer::Session::Mode mode;
int width, height;
framebuffer.info(&width, &height, &mode);
int fb_width, fb_height;
framebuffer.info(&fb_width, &fb_height, &mode);
PDBG("Framebuffer is %dx%d\n", width, height);
typedef uint16_t pixel_t;
pixel_t *fb_base = Genode::env()->rm_session()->attach(framebuffer.dataspace());
PDBG("Framebuffer is %dx%d\n", fb_width, fb_height);
if (mode != Framebuffer::Session::RGB565) {
PERR("Color modes other than RGB565 are not supported. Exiting.");
return 1;
}
static pdfapp_t pdfapp;
pdfapp_init(&pdfapp);
pdfapp.scrw = width;
pdfapp.scrh = height;
pdfapp.resolution = 75; /* XXX read from config */
pdfapp.pageno = 1; /* XXX read from config */
pdfapp.scrw = fb_width;
pdfapp.scrh = fb_height;
pdfapp.resolution = 2*75; /* XXX read from config */
pdfapp.pageno = 9; /* XXX read from config */
char const *file_name = "test.pdf"; /* XXX read from config */
@ -136,6 +206,29 @@ int main(int, char **)
}
pdfapp_open(&pdfapp, (char *)file_name, fd, 0);
if (pdfapp.image->n != 4) {
PERR("Unexpected color depth, expected 4, got %d, Exiting.",
pdfapp.image->n);
return 3;
}
int const x_max = Genode::min(fb_width, pdfapp.image->w);
int const y_max = Genode::min(fb_height, pdfapp.image->h);
Genode::size_t src_line_bytes = pdfapp.image->n * pdfapp.image->w;
unsigned char *src_line = pdfapp.image->samples;
Genode::size_t dst_line_width = fb_width; /* in pixels */
pixel_t *dst_line = fb_base;
for (int y = 0; y < y_max; y++) {
convert_line_rgba_to_rgb565(src_line, dst_line, x_max, y);
src_line += src_line_bytes;
dst_line += dst_line_width;
}
framebuffer.refresh(0, 0, fb_width, fb_height);
Genode::sleep_forever();
return 0;
}