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authorAlessio Treglia <alessio@debian.org>2010-08-16 14:20:17 +0200
committerAlessio Treglia <alessio@debian.org>2010-08-16 14:20:17 +0200
commitbbf22aaaa2fd5fe725a979f801472d52a1323242 (patch)
tree9ce9ef820f4f5e224289872d9b4f9b53908e78b7 /src/page-view.c
parent58d261b93430fd974ab617f15d1da551e43b2675 (diff)
Imported Upstream version 2.31.90.1upstream/2.31.90.1
Diffstat (limited to 'src/page-view.c')
-rw-r--r--src/page-view.c209
1 files changed, 149 insertions, 60 deletions
diff --git a/src/page-view.c b/src/page-view.c
index 2c37fc2..40823f6 100644
--- a/src/page-view.c
+++ b/src/page-view.c
@@ -43,7 +43,7 @@ struct PageViewPrivate
{
/* Page being rendered */
Page *page;
-
+
/* Image to render at current resolution */
GdkPixbuf *image;
@@ -53,6 +53,9 @@ struct PageViewPrivate
/* True if image needs to be regenerated */
gboolean update_image;
+
+ /* Direction of currently scanned image */
+ ScanDirection scan_direction;
/* Next scan line to render */
gint scan_line;
@@ -104,7 +107,8 @@ page_view_set_selected (PageView *view, gboolean selected)
}
-gboolean page_view_get_selected (PageView *view)
+gboolean
+page_view_get_selected (PageView *view)
{
g_return_val_if_fail (view != NULL, FALSE);
return view->priv->selected;
@@ -143,19 +147,92 @@ page_view_get_y_offset (PageView *view)
}
-static guchar *
-get_pixel (guchar *input, gint rowstride, gint n_channels, gint x, gint y)
+static guchar
+get_sample (const guchar *line, gint x, gint depth, gint sample)
+{
+ // FIXME
+ return 0xFF;
+}
+
+
+static void
+get_pixel (Page *page, gint x, gint y, guchar *pixel)
{
- return input + rowstride * y + x * n_channels;
+ gint t, depth, n_channels;
+ const guchar *p, *line;
+
+ switch (page_get_scan_direction (page))
+ {
+ case TOP_TO_BOTTOM:
+ break;
+ case BOTTOM_TO_TOP:
+ x = page_get_scan_width (page) - x;
+ y = page_get_scan_height (page) - y;
+ break;
+ case LEFT_TO_RIGHT:
+ t = x;
+ x = page_get_scan_width (page) - y;
+ y = t;
+ break;
+ case RIGHT_TO_LEFT:
+ t = x;
+ x = y;
+ y = page_get_scan_height (page) - t;
+ break;
+ }
+
+ depth = page_get_depth (page);
+ n_channels = page_get_n_channels (page);
+ line = page_get_pixels (page) + page_get_rowstride (page) * y;
+
+ /* Optimise for 8 bit images */
+ if (depth == 8 && n_channels == 3) {
+ p = line + x * n_channels;
+ pixel[0] = p[0];
+ pixel[1] = p[1];
+ pixel[2] = p[2];
+ return;
+ }
+ else if (depth == 8 && n_channels == 1) {
+ p = line + x;
+ pixel[0] = pixel[1] = pixel[2] = p[0];
+ return;
+ }
+
+ /* Optimise for bitmaps */
+ else if (depth == 1 && n_channels == 1) {
+ p = line + (x / 8);
+ pixel[0] = pixel[1] = pixel[2] = p[0] & (0x80 >> (x % 8)) ? 0x00 : 0xFF;
+ return;
+ }
+
+ /* Optimise for 2 bit images */
+ else if (depth == 2 && n_channels == 1) {
+ gint sample;
+ gint block_shift[4] = { 6, 4, 2, 0 };
+
+ p = line + (x / 4);
+ sample = (p[0] >> block_shift[x % 4]) & 0x3;
+ sample = sample * 255 / 3;
+
+ pixel[0] = pixel[1] = pixel[2] = sample;
+ return;
+ }
+
+ /* Use slow method */
+ pixel[0] = get_sample (line, x, depth, x * n_channels);
+ pixel[0] = get_sample (line, x, depth, x * n_channels + 1);
+ pixel[0] = get_sample (line, x, depth, x * n_channels + 2);
}
static void
-set_pixel (guchar *input, gint rowstride, gint n_channels,
+set_pixel (Page *page,
double l, double r, double t, double b, guchar *pixel)
{
gint x, y;
gint L, R, T, B;
+ guchar p[3];
double scale, red, green, blue;
/* Decimation:
@@ -225,7 +302,7 @@ set_pixel (guchar *input, gint rowstride, gint n_channels,
if ((r - l <= 1.0 && (gint)r == (gint)l) || (b - t <= 1.0 && (gint)b == (gint)t)) {
/* Inside */
if ((gint)l == (gint)r || (gint)t == (gint)b) {
- guchar *p = get_pixel (input, rowstride, n_channels, (gint)l, (gint)t);
+ get_pixel (page, (gint)l, (gint)t, p);
pixel[0] = p[0];
pixel[1] = p[1];
pixel[2] = p[2];
@@ -234,34 +311,34 @@ set_pixel (guchar *input, gint rowstride, gint n_channels,
/* Stradling horizontal edge */
if (L > R) {
- guchar *p = get_pixel (input, rowstride, n_channels, R, T-1);
+ get_pixel (page, R, T-1, p);
red += p[0] * (r-l)*(T-t);
green += p[1] * (r-l)*(T-t);
blue += p[2] * (r-l)*(T-t);
for (y = T; y < B; y++) {
- guchar *p = get_pixel (input, rowstride, n_channels, R, y);
+ get_pixel (page, R, y, p);
red += p[0] * (r-l);
green += p[1] * (r-l);
blue += p[2] * (r-l);
}
- p = get_pixel (input, rowstride, n_channels, R, B);
+ get_pixel (page, R, B, p);
red += p[0] * (r-l)*(b-B);
green += p[1] * (r-l)*(b-B);
blue += p[2] * (r-l)*(b-B);
}
/* Stradling vertical edge */
else {
- guchar *p = get_pixel (input, rowstride, n_channels, L - 1, B);
+ get_pixel (page, L - 1, B, p);
red += p[0] * (b-t)*(L-l);
green += p[1] * (b-t)*(L-l);
blue += p[2] * (b-t)*(L-l);
for (x = L; x < R; x++) {
- guchar *p = get_pixel (input, rowstride, n_channels, x, B);
+ get_pixel (page, x, B, p);
red += p[0] * (b-t);
green += p[1] * (b-t);
blue += p[2] * (b-t);
}
- p = get_pixel (input, rowstride, n_channels, R, B);
+ get_pixel (page, R, B, p);
red += p[0] * (b-t)*(r-R);
green += p[1] * (b-t)*(r-R);
blue += p[2] * (b-t)*(r-R);
@@ -277,7 +354,7 @@ set_pixel (guchar *input, gint rowstride, gint n_channels,
/* Add the middle pixels */
for (x = L; x < R; x++) {
for (y = T; y < B; y++) {
- guchar *p = get_pixel (input, rowstride, n_channels, x, y);
+ get_pixel (page, x, y, p);
red += p[0];
green += p[1];
blue += p[2];
@@ -287,14 +364,14 @@ set_pixel (guchar *input, gint rowstride, gint n_channels,
/* Add the weighted top and bottom pixels */
for (x = L; x < R; x++) {
if (t != T) {
- guchar *p = get_pixel (input, rowstride, n_channels, x, T - 1);
+ get_pixel (page, x, T - 1, p);
red += p[0] * (T - t);
green += p[1] * (T - t);
blue += p[2] * (T - t);
}
if (b != B) {
- guchar *p = get_pixel (input, rowstride, n_channels, x, B);
+ get_pixel (page, x, B, p);
red += p[0] * (b - B);
green += p[1] * (b - B);
blue += p[2] * (b - B);
@@ -304,14 +381,14 @@ set_pixel (guchar *input, gint rowstride, gint n_channels,
/* Add the left and right pixels */
for (y = T; y < B; y++) {
if (l != L) {
- guchar *p = get_pixel (input, rowstride, n_channels, L - 1, y);
+ get_pixel (page, L - 1, y, p);
red += p[0] * (L - l);
green += p[1] * (L - l);
blue += p[2] * (L - l);
}
if (r != R) {
- guchar *p = get_pixel (input, rowstride, n_channels, R, y);
+ get_pixel (page, R, y, p);
red += p[0] * (r - R);
green += p[1] * (r - R);
blue += p[2] * (r - R);
@@ -320,25 +397,25 @@ set_pixel (guchar *input, gint rowstride, gint n_channels,
/* Add the corner pixels */
if (l != L && t != T) {
- guchar *p = get_pixel (input, rowstride, n_channels, L - 1, T - 1);
+ get_pixel (page, L - 1, T - 1, p);
red += p[0] * (L - l)*(T - t);
green += p[1] * (L - l)*(T - t);
blue += p[2] * (L - l)*(T - t);
}
if (r != R && t != T) {
- guchar *p = get_pixel (input, rowstride, n_channels, R, T - 1);
+ get_pixel (page, R, T - 1, p);
red += p[0] * (r - R)*(T - t);
green += p[1] * (r - R)*(T - t);
blue += p[2] * (r - R)*(T - t);
}
if (r != R && b != B) {
- guchar *p = get_pixel (input, rowstride, n_channels, R, B);
+ get_pixel (page, R, B, p);
red += p[0] * (r - R)*(b - B);
green += p[1] * (r - R)*(b - B);
blue += p[2] * (r - R)*(b - B);
}
if (l != L && b != B) {
- guchar *p = get_pixel (input, rowstride, n_channels, L - 1, B);
+ get_pixel (page, L - 1, B, p);
red += p[0] * (L - l)*(b - B);
green += p[1] * (L - l)*(b - B);
blue += p[2] * (L - l)*(b - B);
@@ -353,23 +430,19 @@ set_pixel (guchar *input, gint rowstride, gint n_channels,
static void
-update_preview (GdkPixbuf *image,
+update_preview (Page *page,
GdkPixbuf **output_image, gint output_width, gint output_height,
- Orientation orientation, gint old_scan_line, gint scan_line)
+ ScanDirection scan_direction, gint old_scan_line, gint scan_line)
{
- guchar *input, *output;
+ guchar *output;
gint input_width, input_height;
- gint input_rowstride, input_n_channels;
gint output_rowstride, output_n_channels;
gint x, y;
gint L, R, T, B;
- input = gdk_pixbuf_get_pixels (image);
- input_width = gdk_pixbuf_get_width (image);
- input_height = gdk_pixbuf_get_height (image);
- input_rowstride = gdk_pixbuf_get_rowstride (image);
- input_n_channels = gdk_pixbuf_get_n_channels (image);
-
+ input_width = page_get_width (page);
+ input_height = page_get_height (page);
+
/* Create new image if one does not exist or has changed size */
if (!*output_image ||
gdk_pixbuf_get_width (*output_image) != output_width ||
@@ -381,7 +454,7 @@ update_preview (GdkPixbuf *image,
8,
output_width,
output_height);
-
+
/* Update entire image */
L = 0;
R = output_width - 1;
@@ -390,7 +463,7 @@ update_preview (GdkPixbuf *image,
}
/* Otherwise only update changed area */
else {
- switch (orientation) {
+ switch (scan_direction) {
case TOP_TO_BOTTOM:
L = 0;
R = output_width - 1;
@@ -432,15 +505,25 @@ update_preview (GdkPixbuf *image,
g_return_if_fail (T >= 0);
g_return_if_fail (B < output_height);
g_return_if_fail (*output_image != NULL);
-
+
output = gdk_pixbuf_get_pixels (*output_image);
output_rowstride = gdk_pixbuf_get_rowstride (*output_image);
output_n_channels = gdk_pixbuf_get_n_channels (*output_image);
+
+ if (!page_has_data (page)) {
+ for (x = L; x <= R; x++)
+ for (y = T; y <= B; y++) {
+ guchar *pixel;
+ pixel = output + output_rowstride * y + x * output_n_channels;
+ pixel[0] = pixel[1] = pixel[2] = 0xFF;
+ }
+ return;
+ }
/* Update changed area */
for (x = L; x <= R; x++) {
double l, r;
-
+
l = (double)x * input_width / output_width;
r = (double)(x + 1) * input_width / output_width;
@@ -450,9 +533,9 @@ update_preview (GdkPixbuf *image,
t = (double)y * input_height / output_height;
b = (double)(y + 1) * input_height / output_height;
- set_pixel (input, input_rowstride, input_n_channels,
+ set_pixel (page,
l, r, t, b,
- get_pixel (output, output_rowstride, output_n_channels, x, y));
+ output + output_rowstride * y + x * output_n_channels);
}
}
}
@@ -475,22 +558,27 @@ get_preview_height (PageView *view)
static void
update_page_view (PageView *view)
{
- GdkPixbuf *image;
- gint old_scan_line, scan_line;
+ gint old_scan_line, scan_line, left_steps;
if (!view->priv->update_image)
return;
- image = page_get_image (view->priv->page);
old_scan_line = view->priv->scan_line;
scan_line = page_get_scan_line (view->priv->page);
- update_preview (image,
+ /* Delete old image if scan direction changed */
+ left_steps = view->priv->scan_direction - page_get_scan_direction (view->priv->page);
+ if (left_steps && view->priv->image) {
+ g_object_unref (view->priv->image);
+ view->priv->image = NULL;
+ }
+ view->priv->scan_direction = page_get_scan_direction (view->priv->page);
+
+ update_preview (view->priv->page,
&view->priv->image,
get_preview_width (view),
get_preview_height (view),
- page_get_orientation (view->priv->page), old_scan_line, scan_line);
- g_object_unref (image);
+ page_get_scan_direction (view->priv->page), old_scan_line, scan_line);
view->priv->update_image = FALSE;
view->priv->scan_line = scan_line;
@@ -844,18 +932,8 @@ page_view_render (PageView *view, cairo_t *context)
/* Draw image */
cairo_translate (context, view->priv->border_width, view->priv->border_width);
- if (view->priv->image) {
- gdk_cairo_set_source_pixbuf (context, view->priv->image, 0, 0);
- cairo_paint (context);
- }
- else {
- cairo_scale (context,
- (double) get_preview_width (view) / page_get_width (view->priv->page),
- (double) get_preview_height (view) / page_get_height (view->priv->page));
- gdk_cairo_set_source_pixbuf (context, page_get_image (view->priv->page), 0, 0);
-
- cairo_paint (context);
- }
+ gdk_cairo_set_source_pixbuf (context, view->priv->image, 0, 0);
+ cairo_paint (context);
/* Draw throbber */
if (page_is_scanning (view->priv->page) && !page_has_data (view->priv->page)) {
@@ -895,8 +973,8 @@ page_view_render (PageView *view, cairo_t *context)
double x1, y1, x2, y2;
scan_line = page_get_scan_line (view->priv->page);
-
- switch (page_get_orientation (view->priv->page)) {
+
+ switch (page_get_scan_direction (view->priv->page)) {
case TOP_TO_BOTTOM:
s = page_to_screen_y (view, scan_line);
x1 = 0; y1 = s + 0.5;
@@ -1024,7 +1102,7 @@ page_view_get_height (PageView *view)
static void
-page_image_changed_cb (Page *p, PageView *view)
+page_pixels_changed_cb (Page *p, PageView *view)
{
/* Regenerate image */
view->priv->update_image = TRUE;
@@ -1050,16 +1128,27 @@ page_overlay_changed_cb (Page *p, PageView *view)
static void
+scan_direction_changed_cb (Page *p, PageView *view)
+{
+ /* Regenerate image */
+ view->priv->update_image = TRUE;
+ g_signal_emit (view, signals[SIZE_CHANGED], 0);
+ g_signal_emit (view, signals[CHANGED], 0);
+}
+
+
+static void
page_view_set_page (PageView *view, Page *page)
{
g_return_if_fail (view != NULL);
g_return_if_fail (view->priv->page == NULL);
view->priv->page = g_object_ref (page);
- g_signal_connect (view->priv->page, "image-changed", G_CALLBACK (page_image_changed_cb), view);
+ g_signal_connect (view->priv->page, "pixels-changed", G_CALLBACK (page_pixels_changed_cb), view);
g_signal_connect (view->priv->page, "size-changed", G_CALLBACK (page_size_changed_cb), view);
g_signal_connect (view->priv->page, "crop-changed", G_CALLBACK (page_overlay_changed_cb), view);
g_signal_connect (view->priv->page, "scan-line-changed", G_CALLBACK (page_overlay_changed_cb), view);
+ g_signal_connect (view->priv->page, "scan-direction-changed", G_CALLBACK (scan_direction_changed_cb), view);
}