dany/pdfio
1
0
Fork 0
mirror of https://github.com/michaelrsweet/pdfio.git synced 2026-04-09 13:32:31 +02:00
Code Issues Packages Projects Releases Wiki Activity

Fix handling of partial image blocks (Issue #145)

Browse Source 
Add a partial image block version of the animation test.

Rename test images to make it clear what GIF features are being used.

Finalize test page content/layout.
This commit is contained in:
Michael R Sweet
2026-01-18 11:24:25 -05:00
parent b3aaf2e70f
commit c2f2cd6c37
9 changed files with 53 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
pdfio-content.c
View File

@@ -4030,13 +4030,13 @@ gif_get_block(pdfio_file_t *pdf, // I - PDF file
// 'gif_read_image()' - Read a GIF image stream...
//
static bool // I - `true` on success, `false` on failure
static bool // I - `true` on success, `false` on failure
gif_read_image(
pdfio_file_t *pdf, // I - PDF file
int fd, // I - Input file
uint8_t *data, // I - Indexed image data
size_t width, // I - Width of image
size_t height, // I - Height of image
pdfio_file_t *pdf, // I - PDF file
int fd, // I - Input file
uint8_t *data, // I - Indexed image data
size_t width, // I - Width of image
size_t height, // I - Height of image
int *ncolors, // IO - Number of colors
_pdfio_gif_cmap_t cmap) // I - Colormap
{
@@ -4058,8 +4058,7 @@ gif_read_image(
size_t xpos = 0, // Current X position
ypos = 0, // Current Y position
pass = 0, // Current pass
remaining = width * height;
// Remaining pixels
remaining; // Remaining pixels
bool saw_endblock = false; // Have we seen the 0-length block?
static size_t xpasses[4] = { 8, 8, 4, 2 },
ypasses[5] = { 0, 4, 2, 1, 0 };
@@ -4087,6 +4086,7 @@ gif_read_image(
return (false);
}
remaining = iwidth * iheight;
iwidth += ileft;
iheight += itop;
@@ -4165,7 +4165,7 @@ gif_read_image(
remaining --;
xpos ++;
if (xpos >= width)
if (xpos >= iwidth)
{
// New line...
xpos = ileft;
@@ -4175,7 +4175,7 @@ gif_read_image(
// Skip lines when the image is interlaced...
ypos += xpasses[pass];
if (ypos >= height)
if (ypos >= iheight)
{
pass ++;
ypos = ypasses[pass] + itop;