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[project @ 2003-06-30 15:57:08 by bursa]

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Fix interlaced PNG display.

svn path=/import/netsurf/; revision=192
This commit is contained in:
James Bursa 2003-06-30 15:57:08 +00:00
parent 58267e14fd
commit 4496d3cdbd
2 changed files with 24 additions and 7 deletions
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1
content/content.h
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@ -140,6 +140,7 @@ struct content
png_structp png;
png_infop info;
unsigned long rowbytes;
int interlace;
osspriteop_area *sprite_area;
char *sprite_image;
enum { PNG_PALETTE, PNG_DITHER, PNG_DEEP } type;

30
riscos/png.c
View File

@ -110,7 +110,7 @@ void info_callback(png_structp png, png_infop info)
png_get_PLTE(png, info, &png_palette, &palette_size);
if (interlace == PNG_INTERLACE_ADAM7)
png_set_interlace_handling(png);
; /*png_set_interlace_handling(png);*/
if (png_get_bKGD(png, info, &png_background))
png_set_background(png, png_background,
@ -205,6 +205,7 @@ void info_callback(png_structp png, png_infop info)
png_read_update_info(png, info);
c->data.png.rowbytes = rowbytes = png_get_rowbytes(png, info);
c->data.png.interlace = (interlace == PNG_INTERLACE_ADAM7);
c->data.png.sprite_image = ((char *) sprite) + sprite->image;
c->width = width;
c->height = height;
@ -214,11 +215,17 @@ void info_callback(png_structp png, png_infop info)
}
static unsigned int interlace_start[8] = {0, 4, 0, 2, 0, 1, 0};
static unsigned int interlace_step[8] = {8, 8, 4, 4, 2, 2, 1};
static unsigned int interlace_row_start[8] = {0, 0, 4, 0, 2, 0, 1};
static unsigned int interlace_row_step[8] = {8, 8, 8, 4, 4, 2, 2};
void row_callback(png_structp png, png_bytep new_row,
png_uint_32 row_num, int pass)
{
struct content *c = png_get_progressive_ptr(png);
unsigned long i, rowbytes = c->data.png.rowbytes;
unsigned long i, j, rowbytes = c->data.png.rowbytes;
unsigned int start = 0, step = 1;
int red, green, blue, alpha;
char *row = c->data.png.sprite_image + row_num * ((c->width + 3) & ~3u);
os_colour_number col;
@ -229,14 +236,23 @@ void row_callback(png_structp png, png_bytep new_row,
if (new_row == 0)
return;
if (c->data.png.interlace) {
start = interlace_start[pass];
step = interlace_step[pass];
row_num = interlace_row_start[pass] +
interlace_row_step[pass] * row_num;
row = c->data.png.sprite_image + row_num * ((c->width + 3) & ~3u);
}
if (c->data.png.type == PNG_PALETTE)
png_progressive_combine_row(png, row, new_row);
for (j = 0, i = start; i < rowbytes; i += step)
row[i] = new_row[j++];
else if (c->data.png.type == PNG_DITHER) {
for (i = 0; i * 3 != rowbytes; i++) {
red = new_row[i * 3];
green = new_row[i * 3 + 1];
blue = new_row[i * 3 + 2];
for (j = 0, i = start; i * 3 < rowbytes; i += step) {
red = new_row[j++];
green = new_row[j++];
blue = new_row[j++];
row[i] = colour_table[(red >> 4) << 8 |
(green >> 4) << 4 |
(blue >> 4)];