mewin/libpng
1
0
Fork 0
mirror of https://git.code.sf.net/p/libpng/code.git synced 2025-07-10 18:04:09 +02:00
Code Issues Projects Releases Wiki Activity

Imported from libpng-1.0.5h.tar

Browse Source
This commit is contained in:
Glenn Randers-Pehrson
1999-12-10 09:43:02 -06:00
parent 074af5e9ca
commit 166c5a397e
62 changed files with 3740 additions and 1045 deletions
Download Patch File Download Diff File Expand all files Collapse all files

104
contrib/gregbook/rpng2-x.c
View File

@@ -1,6 +1,6 @@
/*---------------------------------------------------------------------------
rpng2 - progressive-model PNG display program rpng2-x.c
rpng2 - progressive-model PNG display program rpng2-x.c
This program decodes and displays PNG files progressively, as if it were
a web browser (though the front end is only set up to read from files).
@@ -49,13 +49,13 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
#include <setjmp.h> /* for jmpbuf declaration in readpng2.h */
#include <time.h>
#include <math.h> /* only for PvdM background code */
#include <math.h> /* only for PvdM background code */
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xos.h>
#include <X11/keysym.h> /* defines XK_* macros */
#include <X11/keysym.h> /* defines XK_* macros */
#ifdef VMS
#include <unistd.h>
@@ -79,9 +79,9 @@
#define rgb2_max bg_bsat
#define rgb2_min bg_brot
/* #define DEBUG */ /* this enables the Trace() macros */
/* #define DEBUG */ /* this enables the Trace() macros */
#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
#include "readpng2.h" /* typedefs, common macros, readpng2 prototypes */
/* could just include png.h, but this macro is the only thing we need
@@ -89,18 +89,18 @@
* only happen with alpha (which could easily be avoided with
* "ush acopy = (alpha);") */
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
#define alpha_composite(composite, fg, alpha, bg) { \
ush temp = ((ush)(fg)*(ush)(alpha) + \
(ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128); \
(composite) = (uch)((temp + (temp >> 8)) >> 8); \
}
#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
* block size corresponds roughly to a download
* speed 10% faster than theoretical 33.6K maximum
* (assuming 8 data bits, 1 stop bit and no other
* overhead) */
#define INBUFSIZE 4096 /* with pseudo-timing on (1 sec delay/block), this
* block size corresponds roughly to a download
* speed 10% faster than theoretical 33.6K maximum
* (assuming 8 data bits, 1 stop bit and no other
* overhead) */
/* local prototypes */
static void rpng2_x_init(void);
@@ -123,7 +123,7 @@ static mainprog_info rpng2_info;
static uch inbuf[INBUFSIZE];
static int incount;
static int pat = 6; /* must be less than num_bgpat */
static int pat = 6; /* must be less than num_bgpat */
static int bg_image = 0;
static int bgscale = 16;
static ulg bg_rowbytes;
@@ -132,22 +132,22 @@ static uch *bg_data;
static struct rgb_color {
uch r, g, b;
} rgb[] = {
{ 0, 0, 0}, /* 0: black */
{255, 255, 255}, /* 1: white */
{173, 132, 57}, /* 2: tan */
{ 64, 132, 0}, /* 3: medium green */
{189, 117, 1}, /* 4: gold */
{253, 249, 1}, /* 5: yellow */
{ 0, 0, 255}, /* 6: blue */
{ 0, 0, 120}, /* 7: medium blue */
{255, 0, 255}, /* 8: magenta */
{ 64, 0, 64}, /* 9: dark magenta */
{255, 0, 0}, /* 10: red */
{ 64, 0, 0}, /* 11: dark red */
{255, 127, 0}, /* 12: orange */
{192, 96, 0}, /* 13: darker orange */
{ 24, 60, 0}, /* 14: dark green-yellow */
{ 85, 125, 200} /* 15: ice blue */
{ 0, 0, 0}, /* 0: black */
{255, 255, 255}, /* 1: white */
{173, 132, 57}, /* 2: tan */
{ 64, 132, 0}, /* 3: medium green */
{189, 117, 1}, /* 4: gold */
{253, 249, 1}, /* 5: yellow */
{ 0, 0, 255}, /* 6: blue */
{ 0, 0, 120}, /* 7: medium blue */
{255, 0, 255}, /* 8: magenta */
{ 64, 0, 64}, /* 9: dark magenta */
{255, 0, 0}, /* 10: red */
{ 64, 0, 0}, /* 11: dark red */
{255, 127, 0}, /* 12: orange */
{192, 96, 0}, /* 13: darker orange */
{ 24, 60, 0}, /* 14: dark green-yellow */
{ 85, 125, 200} /* 15: ice blue */
};
/* not used for now, but should be for error-checking:
static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
@@ -172,21 +172,21 @@ static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
*/
static struct background_pattern {
ush type;
int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */
int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/
int rgb1_max, rgb1_min; /* or bg_freq, bg_gray */
int rgb2_max, rgb2_min; /* or bg_bsat, bg_brot (both scaled by 10)*/
} bg[] = {
{0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */
{0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */
{0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */
{0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */
{0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */
{0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */
{0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */
{1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */
{1, 12,0, 11,0}, /* diamonds: orange vs. dark red */
{1, 10,0, 7,0}, /* diamonds: red vs. medium blue */
{1, 4,0, 5,0}, /* diamonds: gold vs. yellow */
{1, 3,0, 0,0}, /* diamonds: medium green vs. black */
{0+8, 2,0, 1,15}, /* checkered: tan/black vs. white/ice blue */
{0+24, 2,0, 1,0}, /* checkered: tan/black vs. white/black */
{0+8, 4,5, 0,2}, /* checkered: gold/yellow vs. black/tan */
{0+8, 4,5, 0,6}, /* checkered: gold/yellow vs. black/blue */
{0, 7,0, 8,9}, /* checkered: deep blue/black vs. magenta */
{0+8, 13,0, 5,14}, /* checkered: orange/black vs. yellow */
{0+8, 12,0, 10,11}, /* checkered: orange/black vs. red */
{1, 7,0, 8,0}, /* diamonds: deep blue/black vs. magenta */
{1, 12,0, 11,0}, /* diamonds: orange vs. dark red */
{1, 10,0, 7,0}, /* diamonds: red vs. medium blue */
{1, 4,0, 5,0}, /* diamonds: gold vs. yellow */
{1, 3,0, 0,0}, /* diamonds: medium green vs. black */
{2, 16, 100, 20, 0}, /* radial: ~hard radial color-beams */
{2, 18, 100, 10, 2}, /* radial: soft, curved radial color-beams */
{2, 16, 256, 100, 250}, /* radial: very tight spiral */
@@ -580,7 +580,7 @@ static int rpng2_x_create_window()
return 2;
}
have_colormap = TRUE;
bg_image = FALSE; /* gradient just wastes palette entries */
bg_image = FALSE; /* gradient just wastes palette entries */
} else if (depth == 16) {
RPixelShift = 15 - rpng2_x_msb(RedMask); /* these are right-shifts */
GPixelShift = 15 - rpng2_x_msb(GreenMask);
@@ -684,7 +684,7 @@ static int rpng2_x_create_window()
---------------------------------------------------------------------------*/
if (bg_image)
rpng2_x_load_bg_image(); /* resets bg_image if fails */
rpng2_x_load_bg_image(); /* resets bg_image if fails */
if (!bg_image) {
if (depth == 24 || depth == 32) {
@@ -795,7 +795,7 @@ static int rpng2_x_load_bg_image()
even_odd = even_odd_vert ^ even_odd_horiz;
invert_column =
(even_odd_horiz && (bg[pat].type & 0x10));
if (even_odd == 0) { /* gradient #1 */
if (even_odd == 0) { /* gradient #1 */
if (invert_column) {
*dest++ = r1_inv;
*dest++ = g1_inv;
@@ -805,7 +805,7 @@ static int rpng2_x_load_bg_image()
*dest++ = g1;
*dest++ = b1;
}
} else { /* gradient #2 */
} else { /* gradient #2 */
if ((invert_column && invert_gradient2) ||
(!invert_column && !invert_gradient2))
{
@@ -828,8 +828,8 @@ static int rpng2_x_load_bg_image()
} else if ((bg[pat].type & 0x07) == 1) {
hmax = (bgscale-1)/2; /* half the max weight of a color */
max = 2*hmax; /* the max weight of a color */
hmax = (bgscale-1)/2; /* half the max weight of a color */
max = 2*hmax; /* the max weight of a color */
r1 = rgb[bg[pat].rgb1_max].r;
g1 = rgb[bg[pat].rgb1_max].g;