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image: Combine clamp_view() and center_view () 

We need to clamp or center on a per axis basis.  If the window is wider
but the image is taller, we need to center horizontally but
clamp vertically.  We can only do that if by combining the two
functions.
This commit is contained in:
Kristian Høgsberg 2012-10-30 15:46:25 -04:00
parent 719b2158e7
commit d3bf6766ab
1 changed files with 23 additions and 40 deletions
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63
clients/image.c
View File

@ -69,17 +69,6 @@ get_scale(struct image *image)
return image->matrix.xx;
}
static void
center_view(struct image *image)
{
struct rectangle allocation;
double scale = get_scale(image);
widget_get_allocation(image->widget, &allocation);
image->matrix.x0 = (allocation.width - image->width * scale) / 2;
image->matrix.y0 = (allocation.height - image->height * scale) / 2;
}
static void
clamp_view(struct image *image)
{
@ -91,14 +80,25 @@ clamp_view(struct image *image)
sh = image->height * scale;
widget_get_allocation(image->widget, &allocation);
if (image->matrix.x0 > 0.0)
image->matrix.x0 = 0.0;
if (image->matrix.y0 > 0.0)
image->matrix.y0 = 0.0;
if (sw + image->matrix.x0 < allocation.width)
image->matrix.x0 = allocation.width - sw;
if (sh + image->matrix.y0 < allocation.height)
image->matrix.y0 = allocation.height - sh;
if (sw < allocation.width) {
image->matrix.x0 =
(allocation.width - image->width * scale) / 2;
} else {
if (image->matrix.x0 > 0.0)
image->matrix.x0 = 0.0;
if (sw + image->matrix.x0 < allocation.width)
image->matrix.x0 = allocation.width - sw;
}
if (sh < allocation.width) {
image->matrix.y0 =
(allocation.height - image->height * scale) / 2;
} else {
if (image->matrix.y0 > 0.0)
image->matrix.y0 = 0.0;
if (sh + image->matrix.y0 < allocation.height)
image->matrix.y0 = allocation.height - sh;
}
}
static void
@ -141,7 +141,7 @@ redraw_handler(struct widget *widget, void *data)
image->height = height;
cairo_matrix_init_scale(&image->matrix, scale, scale);
center_view(image);
clamp_view(image);
}
matrix = image->matrix;
@ -166,7 +166,7 @@ resize_handler(struct widget *widget,
{
struct image *image = data;
center_view(image);
clamp_view(image);
}
static void
@ -196,18 +196,6 @@ enter_handler(struct widget *widget,
return 1;
}
static bool
image_is_smaller(struct image *image)
{
double scale;
struct rectangle allocation;
scale = get_scale(image);
widget_get_allocation(image->widget, &allocation);
return scale * image->width < allocation.width;
}
static void
move_viewport(struct image *image, double dx, double dy)
{
@ -217,11 +205,7 @@ move_viewport(struct image *image, double dx, double dy)
return;
cairo_matrix_translate(&image->matrix, -dx/scale, -dy/scale);
if (image_is_smaller(image))
center_view(image);
else
clamp_view(image);
clamp_view(image);
window_schedule_redraw(image->window);
}
@ -288,8 +272,7 @@ zoom(struct image *image, double scale)
cairo_matrix_translate(&scale_matrix, -x, -y);
cairo_matrix_multiply(&image->matrix, &image->matrix, &scale_matrix);
if (image_is_smaller(image))
center_view(image);
clamp_view(image);
}
static void