* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include "main.h"
#include "pixbuf-util.h"
+#include <algorithm>
+#include <cmath>
+#include <cstdlib>
+#include <cstring>
+#include <utility>
+
+#include <cairo.h>
+#include <gio/gio.h>
+#include <glib-object.h>
+#include <pango/pangocairo.h>
+
+#include <config.h>
+
+#include "debug.h"
#include "exif.h"
#include "filedata.h"
+#include "main-defines.h"
+#include "typedefs.h"
#include "ui-fileops.h"
-#include <cmath>
-
/*
*-----------------------------------------------------------------------------
#pragma GCC diagnostic ignored "-Wunused-function"
gboolean pixbuf_to_file_as_jpg_unused(GdkPixbuf *pixbuf, const gchar *filename, gint quality)
{
- GError *error = NULL;
+ GError *error = nullptr;
gchar *qbuf;
gboolean ret;
if (w > requested_width || h > requested_height)
{
- gint nw, nh;
+ gint nw;
+ gint nh;
if (pixbuf_scale_aspect(requested_width, requested_height,
w, h, &nw, &nh))
*/
gboolean util_clip_region(gint x, gint y, gint w, gint h,
- gint clip_x, gint clip_y, gint clip_w, gint clip_h,
- gint *rx, gint *ry, gint *rw, gint *rh)
+ gint clip_x, gint clip_y, gint clip_w, gint clip_h,
+ gint &rx, gint &ry, gint &rw, gint &rh)
{
- if (clip_x + clip_w <= x ||
- clip_x >= x + w ||
- clip_y + clip_h <= y ||
- clip_y >= y + h)
+ GdkRectangle main{x, y, w, h};
+ GdkRectangle clip{clip_x, clip_y, clip_w, clip_h};
+ GdkRectangle r;
+
+ const gboolean rectangles_intersect = gdk_rectangle_intersect(&main, &clip, &r);
+ if (rectangles_intersect)
{
- return FALSE;
+ rx = r.x;
+ ry = r.y;
+ rw = r.width;
+ rh = r.height;
}
- *rx = MAX(x, clip_x);
- *rw = MIN((x + w), (clip_x + clip_w)) - *rx;
-
- *ry = MAX(y, clip_y);
- *rh = MIN((y + h), (clip_y + clip_h)) - *ry;
-
- return TRUE;
+ return rectangles_intersect;
}
/*
guchar *dest, gint dest_row_stride, gint w, gint h,
gint bytes_per_pixel, gboolean counter_clockwise)
{
- gint i, j;
+ gint i;
+ gint j;
guchar *sp;
guchar *dp;
}
}
-#define ROTATE_BUFFER_WIDTH 48
-#define ROTATE_BUFFER_HEIGHT 48
+enum {
+ ROTATE_BUFFER_WIDTH = 48,
+ ROTATE_BUFFER_HEIGHT = 48
+};
/*
* Returns a copy of pixbuf src rotated 90 degrees clockwise or 90 counterclockwise
{
GdkPixbuf *dest;
gboolean has_alpha;
- gint sw, sh, srs;
- gint dw, dh, drs;
+ gint sw;
+ gint sh;
+ gint srs;
+ gint dw;
+ gint dh;
+ gint drs;
guchar *s_pix;
guchar *d_pix;
- gint i, j;
+ gint i;
+ gint j;
gint a;
GdkPixbuf *buffer;
guchar *b_pix;
gint brs;
- gint w, h;
+ gint w;
+ gint h;
if (!src) return nullptr;
w = MIN(ROTATE_BUFFER_WIDTH, (sh - i));
for (j = 0; j < sw; j += ROTATE_BUFFER_HEIGHT)
{
- gint x, y;
+ gint x;
+ gint y;
h = MIN(ROTATE_BUFFER_HEIGHT, (sw - j));
pixbuf_copy_block_rotate(s_pix, srs, j, i,
{
GdkPixbuf *dest;
gboolean has_alpha;
- gint w, h, srs;
+ gint w;
+ gint h;
+ gint srs;
gint drs;
guchar *s_pix;
guchar *d_pix;
guchar *sp;
guchar *dp;
- gint i, j;
+ gint i;
+ gint j;
gint a;
if (!src) return nullptr;
gint r, gint g, gint b, gint a)
{
gboolean has_alpha;
- gint pw, ph, prs;
+ gint pw;
+ gint ph;
+ gint prs;
guchar *p_pix;
guchar *pp;
- gint i, j;
+ gint i;
+ gint j;
if (!pb) return;
prs = gdk_pixbuf_get_rowstride(pb);
p_pix = gdk_pixbuf_get_pixels(pb);
+ const gint p_step = has_alpha ? 4 : 3;
+
for (i = 0; i < h; i++)
{
- pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
+ pp = p_pix + (y + i) * prs + (x * p_step);
for (j = 0; j < w; j++)
{
- *pp = (r * a + *pp * (256-a)) >> 8;
- pp++;
- *pp = (g * a + *pp * (256-a)) >> 8;
- pp++;
- *pp = (b * a + *pp * (256-a)) >> 8;
- pp++;
- if (has_alpha) pp++;
+ pp[0] = (r * a + pp[0] * (256-a)) >> 8;
+ pp[1] = (g * a + pp[1] * (256-a)) >> 8;
+ pp[2] = (b * a + pp[2] * (256-a)) >> 8;
+ // TODO(xsdg): Should we do anything about a potential
+ // existing alpha value here?
+ pp += p_step;
}
}
}
gint r, gint g, gint b, gint a)
{
gboolean has_alpha;
- gint pw, ph, prs;
+ gint pw;
+ gint ph;
+ gint prs;
guchar *p_pix;
guchar *pp;
- gint i, j;
+ gint i;
+ gint j;
if (!pb) return;
prs = gdk_pixbuf_get_rowstride(pb);
p_pix = gdk_pixbuf_get_pixels(pb);
+ const gint p_step = has_alpha ? 4 : 3;
+
for (i = 0; i < h; i++)
{
- pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
+ pp = p_pix + (y + i) * prs + (x * p_step);
for (j = 0; j < w; j++)
{
*pp = r; pp++;
void pixbuf_set_rect(GdkPixbuf *pb,
gint x, gint y, gint w, gint h,
gint r, gint g, gint b, gint a,
- gint left, gint right, gint top, gint bottom)
+ gint left_width, gint right_width, gint top_width, gint bottom_width)
{
- pixbuf_set_rect_fill(pb, x + left, y, w - left - right, top,
+ // TODO(xsdg): This function has multiple off-by-one errors. Would be
+ // much easier to read (and implement correctly) with temporaries to
+ // translate from (x, y, w, h) coordinates to (x1, y1, x2, y2).
+ pixbuf_set_rect_fill(pb,
+ x + left_width, y, w - left_width - right_width, top_width,
r, g, b ,a);
- pixbuf_set_rect_fill(pb, x + w - right, y, right, h,
+ pixbuf_set_rect_fill(pb,
+ x + w - right_width, y, right_width, h,
r, g, b ,a);
- pixbuf_set_rect_fill(pb, x + left, y + h - bottom, w - left - right, bottom,
+ pixbuf_set_rect_fill(pb,
+ x + left_width, y + h - bottom_width, w - left_width - right_width, bottom_width,
r, g, b ,a);
- pixbuf_set_rect_fill(pb, x, y, left, h,
+ pixbuf_set_rect_fill(pb,
+ x, y, left_width, h,
r, g, b ,a);
}
gint w, gint h,
guint8 r, guint8 g, guint8 b, guint8 a)
{
- gint sw, sh, srs;
+ gint sw;
+ gint sh;
+ gint srs;
gboolean s_alpha;
gint s_step;
guchar *s_pix;
- gint dw, dh, drs;
+ gint dw;
+ gint dh;
+ gint drs;
gboolean d_alpha;
gint d_step;
guchar *d_pix;
guchar *sp;
guchar *dp;
- gint i, j;
+ gint i;
+ gint j;
if (!src || !dest) return;
guint8 r, guint8 g, guint8 b, guint8 a)
{
GdkPixbuf *buffer;
- gint w, h;
- gint sx, sy;
- gint dw, dh;
+ gint w;
+ gint h;
+ gint sx;
+ gint sy;
+ gint dw;
+ gint dh;
cairo_surface_t *source;
cairo_t *cr;
*/
void util_clip_triangle(gint x1, gint y1, gint x2, gint y2, gint x3, gint y3,
- gint *rx, gint *ry, gint *rw, gint *rh)
+ gint &rx, gint &ry, gint &rw, gint &rh)
{
- gint tx, ty, tw, th;
-
- tx = MIN(x1, x2);
- tx = MIN(tx, x3);
- ty = MIN(y1, y2);
- ty = MIN(ty, y3);
- tw = MAX(abs(x1 - x2), abs(x2 - x3));
- tw = MAX(tw, abs(x3 - x1));
- th = MAX(abs(y1 - y2), abs(y2 - y3));
- th = MAX(th, abs(y3 - y1));
-
- *rx = tx;
- *ry = ty;
- *rw = tw;
- *rh = th;
+ rx = std::min({x1, x2, x3});
+ ry = std::min({y1, y2, y3});
+ rw = std::max({abs(x1 - x2), abs(x2 - x3), abs(x3 - x1)});
+ rh = std::max({abs(y1 - y2), abs(y2 - y3), abs(y3 - y1)});
}
void pixbuf_draw_triangle(GdkPixbuf *pb,
guint8 r, guint8 g, guint8 b, guint8 a)
{
gboolean has_alpha;
- gint pw, ph, prs;
- gint rx, ry, rw, rh;
- gint tx, ty, tw, th;
- gint fx1, fy1;
- gint fx2, fy2;
- gint fw, fh;
+ gint pw;
+ gint ph;
+ gint prs;
+ gint rx;
+ gint ry;
+ gint rw;
+ gint rh;
+ gint tx;
+ gint ty;
+ gint tw;
+ gint th;
+ gint fx1;
+ gint fy1;
+ gint fx2;
+ gint fy2;
+ gint fw;
+ gint fh;
guchar *p_pix;
guchar *pp;
gint p_step;
- gdouble slope1, slope2;
- gint slope1_x, slope1_y;
+ gdouble slope1;
+ gdouble slope2;
+ gint slope1_x;
+ gint slope1_y;
gint y;
- gint t;
gboolean middle = FALSE;
if (!pb) return;
pw = gdk_pixbuf_get_width(pb);
ph = gdk_pixbuf_get_height(pb);
+ // Intersects the clip region with the pixbuf. r{x,y,w,h} is that
+ // intersecting region.
if (!util_clip_region(0, 0, pw, ph,
- clip_x, clip_y, clip_w, clip_h,
- &rx, &ry, &rw, &rh)) return;
+ clip_x, clip_y, clip_w, clip_h,
+ rx, ry, rw, rh)) return;
+ // Determine the bounding box for the triangle.
util_clip_triangle(x1, y1, x2, y2, x3, y3,
- &tx, &ty, &tw, &th);
+ tx, ty, tw, th);
+ // And now clip the triangle bounding box to the pixbuf clipping region.
if (!util_clip_region(rx, ry, rw, rh,
- tx, ty, tw, th,
- &fx1, &fy1, &fw, &fh)) return;
+ tx, ty, tw, th,
+ fx1, fy1, fw, fh)) return;
fx2 = fx1 + fw;
fy2 = fy1 + fh;
p_step = (has_alpha) ? 4 : 3;
+ // Ensure that points are ordered by increasing y coordinate.
if (y1 > y2)
{
- t = x1; x1 = x2; x2 = t;
- t = y1; y1 = y2; y2 = t;
+ std::swap(x1, x2);
+ std::swap(y1, y2);
}
if (y2 > y3)
{
- t = x2; x2 = x3; x3 = t;
- t = y2; y2 = y3; y3 = t;
+ std::swap(x2, x3);
+ std::swap(y2, y3);
}
if (y1 > y2)
{
- t = x1; x1 = x2; x2 = t;
- t = y1; y1 = y2; y2 = t;
+ std::swap(x1, x2);
+ std::swap(y1, y2);
}
+ // TODO(xsdg): Drop these explicit casts. Int will always promote to
+ // double without issue.
slope1 = static_cast<gdouble>(y2 - y1);
if (slope1) slope1 = static_cast<gdouble>(x2 - x1) / slope1;
slope1_x = x1;
for (y = fy1; y < fy2; y++)
{
- gint xa, xb;
+ gint xa;
+ gint xb;
if (!middle && y > y2)
{
if (xa > xb)
{
- t = xa; xa = xb; xb = t;
+ std::swap(xa, xb);
}
xa = CLAMP(xa, fx1, fx2);
while (xa < xb)
{
- *pp = (r * a + *pp * (256-a)) >> 8;
- pp++;
- *pp = (g * a + *pp * (256-a)) >> 8;
- pp++;
- *pp = (b * a + *pp * (256-a)) >> 8;
- pp++;
- if (has_alpha) pp++;
+ pp[0] = (r * a + pp[0] * (256-a)) >> 8;
+ pp[1] = (g * a + pp[1] * (256-a)) >> 8;
+ pp[2] = (b * a + pp[2] * (256-a)) >> 8;
+ pp += p_step;
xa++;
}
*-----------------------------------------------------------------------------
*/
+/**
+ * @brief Clips the specified line segment to the specified clipping region.
+ * @param[in] clip_x,clip_y Coordinates of the top-left corner of the clipping region.
+ * @param[in] clip_w,clip_h Extent of the clipping region.
+ * @param[in] x1,y1 Coordinates of the first point of the line segment.
+ * @param[in] x2,y2 Coordinates of the second point of the line segment.
+ * @param[out] rx1,ry1 Computed coordinates of the first point of the clipped line segment.
+ * @param[out] rx2,ry2 Computed coordinates of the second point of the clipped line segment.
+ * @retval FALSE The line segment lies outside of the clipping region.
+ * @retval TRUE The clip operation was performed, and the output params were set.
+ */
static gboolean util_clip_line(gdouble clip_x, gdouble clip_y, gdouble clip_w, gdouble clip_h,
gdouble x1, gdouble y1, gdouble x2, gdouble y2,
gdouble *rx1, gdouble *ry1, gdouble *rx2, gdouble *ry2)
gboolean flip = FALSE;
gdouble d;
+ // Normalize: Line endpoint 1 must be farther left.
if (x1 > x2)
{
- gdouble t;
-
- t = x1; x1 = x2; x2 = t;
- t = y1; y1 = y2; y2 = t;
+ std::swap(x1, x2);
+ std::swap(y1, y2);
flip = TRUE;
}
+ // Ensure the line horizontally overlaps with the clip region.
if (x2 < clip_x || x1 > clip_x + clip_w) return FALSE;
+ // Ensure the line vertically overlaps with the clip region.
+ // Note that a line can both horizontally and vertically overlap with
+ // clipping region, while still being outside of the clipping region. That
+ // case is detected further below.
if (y1 < y2)
{
if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
}
d = x2 - x1;
+ // TODO(xsdg): Either use ints here, or define a reasonable epsilon to do the
+ // right thing if -epsilon < d < 0. We already guaranteed above that x2 >= x1.
if (d > 0.0)
{
gdouble slope;
slope = (y2 - y1) / d;
+ // If needed, project (x1, y1) to be horizontally within the clip
+ // region, while maintaining the line's slope and y-offset.
if (x1 < clip_x)
{
y1 = y1 + slope * (clip_x - x1);
x1 = clip_x;
}
+ // Likewise with (x2, y2).
if (x2 > clip_x + clip_w)
{
y2 = y2 + slope * (clip_x + clip_w - x2);
}
}
+ // Check that any horizontal projections didn't cause the line segment to
+ // no longer vertically overlap with the clip region.
if (y1 < y2)
{
if (y2 < clip_y || y1 > clip_y + clip_h) return FALSE;
}
else
{
- gdouble t;
-
if (y1 < clip_y || y2 > clip_y + clip_h) return FALSE;
- t = x1; x1 = x2; x2 = t;
- t = y1; y1 = y2; y2 = t;
+ // Re-normalize: line endpoint 1 must be farther up.
+ std::swap(x1, x2);
+ std::swap(y1, y2);
flip = !flip;
}
gdouble slope;
slope = (x2 - x1) / d;
+ // If needed, project (x1, y1) to be vertically within the clip
+ // region, while maintaining the line's slope and x-offset.
if (y1 < clip_y)
{
x1 = x1 + slope * (clip_y - y1);
y1 = clip_y;
}
+ // Likewise with (x2, y2).
if (y2 > clip_y + clip_h)
{
x2 = x2 + slope * (clip_y + clip_h - y2);
}
}
+ // Set the output params, accounting for any flips that might have
+ // happened during normalization.
if (flip)
{
*rx1 = x2;
guint8 r, guint8 g, guint8 b, guint8 a)
{
gboolean has_alpha;
- gint pw, ph, prs;
- gint rx, ry, rw, rh;
- gdouble rx1, ry1, rx2, ry2;
+ gint pw;
+ gint ph;
+ gint prs;
+ gint rx;
+ gint ry;
+ gint rw;
+ gint rh;
+ gdouble rx1;
+ gdouble ry1;
+ gdouble rx2;
+ gdouble ry2;
guchar *p_pix;
guchar *pp;
gint p_step;
gdouble slope;
- gdouble x, y;
- gint px, py;
- gint cx1, cy1, cx2, cy2;
+ gdouble x;
+ gdouble y;
+ gint px;
+ gint py;
+ gint cx1;
+ gint cy1;
+ gint cx2;
+ gint cy2;
if (!pb) return;
pw = gdk_pixbuf_get_width(pb);
ph = gdk_pixbuf_get_height(pb);
+ // Intersects the clip region with the pixbuf. r{x,y,w,h} is that
+ // intersecting region.
if (!util_clip_region(0, 0, pw, ph,
- clip_x, clip_y, clip_w, clip_h,
- &rx, &ry, &rw, &rh)) return;
+ clip_x, clip_y, clip_w, clip_h,
+ rx, ry, rw, rh)) return;
+ // TODO(xsdg): These explicit casts are unnecessary and harm readability.
+ // Clips the specified line segment to the intersecting region from above.
if (!util_clip_line(static_cast<gdouble>(rx), static_cast<gdouble>(ry), static_cast<gdouble>(rw), static_cast<gdouble>(rh),
static_cast<gdouble>(x1), static_cast<gdouble>(y1), static_cast<gdouble>(x2), static_cast<gdouble>(y2),
&rx1, &ry1, &rx2, &ry2)) return;
p_step = (has_alpha) ? 4 : 3;
+ // We draw the clipped line segment along the longer axis first, and
+ // allow the shorter axis to follow. This is because our raster line segment
+ // will contain max(rx2-rx1, ry2-ry1) pixels, and the pixels along the
+ // shorter axis may not advance for each cycle (the line is not anti-aliased).
if (fabs(rx2 - rx1) > fabs(ry2 - ry1))
{
if (rx1 > rx2)
{
- gdouble t;
- t = rx1; rx1 = rx2; rx2 = t;
- t = ry1; ry1 = ry2; ry2 = t;
+ std::swap(rx1, rx2);
+ std::swap(ry1, ry2);
}
slope = rx2 - rx1;
{
if (ry1 > ry2)
{
- gdouble t;
- t = rx1; rx1 = rx2; rx2 = t;
- t = ry1; ry1 = ry2; ry2 = t;
+ std::swap(rx1, rx2);
+ std::swap(ry1, ry2);
}
slope = ry2 - ry1;
*-----------------------------------------------------------------------------
*/
+/**
+ * @brief Composites a horizontal or vertical linear gradient into the rectangular
+ * region defined by corners `(x1, y1)` and `(x2, y2)`. Note that the
+ * current implementation breaks if the max distance between `s` and
+ * `x1/x2/y1/y2` is greater than `border`.
+ * @param p_pix The pixel buffer to paint into.
+ * @param prs The pixel row stride (how many pixels per row of the buffer).
+ * @param has_alpha TRUE if the p_pix representation is rgba. FALSE if just rgb.
+ * @param s The "center" of the gradient, along the axis defined by `vertical`.
+ * Note that if the center is not along an edge, the gradient will be
+ * symmetric about the center.
+ * @param vertical When `TRUE`, the gradient color will vary vertically. When `FALSE`,
+ * horizontally.
+ * @param border The maximum extent of the gradient, in pixels.
+ * @param x1,y1 Coordinates of the first corner of the region.
+ * @param x2,y2 Coordinates of the second corner of the region.
+ * @param r,g,b Base color of the gradient.
+ * @param a The peak alpha value when compositing the gradient. The alpha varies
+ * from this value down to 0 (fully transparent). Note that any alpha
+ * value associated with the original pixel is unmodified.
+ */
static void pixbuf_draw_fade_linear(guchar *p_pix, gint prs, gboolean has_alpha,
gint s, gboolean vertical, gint border,
gint x1, gint y1, gint x2, gint y2,
guchar *pp;
gint p_step;
guint8 n = a;
- gint i, j;
+ gint i;
+ gint j;
p_step = (has_alpha) ? 4 : 3;
for (j = y1; j < y2; j++)
for (i = x1; i < x2; i++)
{
if (vertical) n = a - a * abs(i - s) / border;
- *pp = (r * n + *pp * (256-n)) >> 8;
- pp++;
- *pp = (g * n + *pp * (256-n)) >> 8;
- pp++;
- *pp = (b * n + *pp * (256-n)) >> 8;
- pp++;
- if (has_alpha) pp++;
+ pp[0] = (r * n + pp[0] * (256-n)) >> 8;
+ pp[1] = (g * n + pp[1] * (256-n)) >> 8;
+ pp[2] = (b * n + pp[2] * (256-n)) >> 8;
+ pp += p_step;
}
}
}
+/**
+ * @brief Composites a radial gradient into the rectangular region defined by
+ * corners `(x1, y1)` and `(x2, y2)`.
+ * @param p_pix The pixel buffer to paint into.
+ * @param prs The pixel row stride (how many pixels per row of the buffer).
+ * @param has_alpha TRUE if the p_pix representation is rgba. FALSE if just rgb.
+ * @param sx,sy The coordinates of the center of the gradient.
+ * @param border The max radius, in pixels, of the gradient. Pixels farther away
+ * from the center than this will be unaffected.
+ * @param x1,y1 Coordinates of the first corner of the region.
+ * @param x2,y2 Coordinates of the second corner of the region.
+ * @param r,g,b Base color of the gradient.
+ * @param a The peak alpha value when compositing the gradient. The alpha varies
+ * from this value down to 0 (fully transparent). Note that any alpha
+ * value associated with the original pixel is unmodified.
+ */
static void pixbuf_draw_fade_radius(guchar *p_pix, gint prs, gboolean has_alpha,
gint sx, gint sy, gint border,
gint x1, gint y1, gint x2, gint y2,
guint8, guint8 g, guint8 b, guint8 a)
{
+ // TODO(xsdg): r (red) was shadowed by r (radius), and was removed from
+ // the params list by an automated cleanup. Fix this and distinguish the
+ // red param from the radius temporary variable.
guchar *pp;
gint p_step;
- gint i, j;
+ gint i;
+ gint j;
p_step = (has_alpha) ? 4 : 3;
for (j = y1; j < y2; j++)
r = MIN(border, (gint)hypot(i - sx, j - sy));
n = a - a * r / border;
- *pp = (r * n + *pp * (256-n)) >> 8;
- pp++;
- *pp = (g * n + *pp * (256-n)) >> 8;
- pp++;
- *pp = (b * n + *pp * (256-n)) >> 8;
- pp++;
- if (has_alpha) pp++;
+ pp[0] = (r * n + pp[0] * (256-n)) >> 8;
+ pp[1] = (g * n + pp[1] * (256-n)) >> 8;
+ pp[2] = (b * n + pp[2] * (256-n)) >> 8;
+ pp += p_step;
}
}
}
guint8 r, guint8 g, guint8 b, guint8 a)
{
gint has_alpha;
- gint pw, ph, prs;
- gint rx, ry, rw, rh;
- gint fx, fy, fw, fh;
+ gint pw;
+ gint ph;
+ gint prs;
+ gint rx;
+ gint ry;
+ gint rw;
+ gint rh;
+ gint fx;
+ gint fy;
+ gint fw;
+ gint fh;
guchar *p_pix;
if (!pb) return;
pw = gdk_pixbuf_get_width(pb);
ph = gdk_pixbuf_get_height(pb);
+ // Intersects the clip region with the pixbuf. r{x,y,w,h} is that
+ // intersecting region.
if (!util_clip_region(0, 0, pw, ph,
- clip_x, clip_y, clip_w, clip_h,
- &rx, &ry, &rw, &rh)) return;
+ clip_x, clip_y, clip_w, clip_h,
+ rx, ry, rw, rh)) return;
has_alpha = gdk_pixbuf_get_has_alpha(pb);
prs = gdk_pixbuf_get_rowstride(pb);
p_pix = gdk_pixbuf_get_pixels(pb);
+ // Composites the specified color into the rectangle specified by x, y, w, h,
+ // as contracted by `border` pixels, with a composition fraction that's defined
+ // by the supplied `a` parameter.
if (util_clip_region(x + border, y + border, w - border * 2, h - border * 2,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_rect_fill(pb, fx, fy, fw, fh, r, g, b, a);
}
if (border < 1) return;
+ // Draws linear gradients along each of the 4 edges.
if (util_clip_region(x, y + border, border, h - border * 2,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
x + border, TRUE, border,
r, g, b, a);
}
if (util_clip_region(x + w - border, y + border, border, h - border * 2,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
x + w - border, TRUE, border,
r, g, b, a);
}
if (util_clip_region(x + border, y, w - border * 2, border,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
y + border, FALSE, border,
r, g, b, a);
}
if (util_clip_region(x + border, y + h - border, w - border * 2, border,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_linear(p_pix, prs, has_alpha,
y + h - border, FALSE, border,
fx, fy, fx + fw, fy + fh,
r, g, b, a);
}
+ // Draws radial gradients at each of the 4 corners.
if (util_clip_region(x, y, border, border,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
x + border, y + border, border,
r, g, b, a);
}
if (util_clip_region(x + w - border, y, border, border,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
x + w - border, y + border, border,
r, g, b, a);
}
if (util_clip_region(x, y + h - border, border, border,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
x + border, y + h - border, border,
r, g, b, a);
}
if (util_clip_region(x + w - border, y + h - border, border, border,
- rx, ry, rw, rh,
- &fx, &fy, &fw, &fh))
+ rx, ry, rw, rh,
+ fx, fy, fw, fh))
{
pixbuf_draw_fade_radius(p_pix, prs, has_alpha,
x + w - border, y + h - border, border,
gint x, gint y, gint w, gint h)
{
gboolean has_alpha;
- gint pw, ph, prs;
+ gint pw;
+ gint ph;
+ gint prs;
guchar *p_pix;
guchar *pp;
- gint i, j;
+ gint i;
+ gint j;
if (!pb) return;
prs = gdk_pixbuf_get_rowstride(pb);
p_pix = gdk_pixbuf_get_pixels(pb);
+ const gint p_step = has_alpha ? 4 : 3;
+
for (i = 0; i < h; i++)
{
- pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
+ pp = p_pix + (y + i) * prs + (x * p_step);
for (j = 0; j < w; j++)
{
guint8 grey;
grey = (pp[0] + pp[1] + pp[2]) / 3;
- *pp = grey;
- pp++;
- *pp = grey;
- pp++;
- *pp = grey;
- pp++;
- if (has_alpha) pp++;
+ pp[0] = grey;
+ pp[1] = grey;
+ pp[2] = grey;
+ pp += p_step;
}
}
}
/*
*-----------------------------------------------------------------------------
- * pixbuf highlight under/over exposure *-----------------------------------------------------------------------------
+ * pixbuf highlight under/over exposure
+ *-----------------------------------------------------------------------------
*/
void pixbuf_highlight_overunderexposed(GdkPixbuf *pb, gint x, gint y, gint w, gint h)
{
gboolean has_alpha;
- gint pw, ph, prs;
+ gint pw;
+ gint ph;
+ gint prs;
guchar *p_pix;
guchar *pp;
- gint i, j;
+ gint i;
+ gint j;
if (!pb) return;
prs = gdk_pixbuf_get_rowstride(pb);
p_pix = gdk_pixbuf_get_pixels(pb);
+ const gint p_step = has_alpha ? 4 : 3;
+
for (i = 0; i < h; i++)
{
- pp = p_pix + (y + i) * prs + (x * (has_alpha ? 4 : 3));
+ pp = p_pix + (y + i) * prs + (x * p_step);
for (j = 0; j < w; j++)
{
if (pp[0] == 255 || pp[1] == 255 || pp[2] == 255 || pp[0] == 0 || pp[1] == 0 || pp[2] == 0)
{
- *pp = 255;
- pp++;
- *pp = 0;
- pp++;
- *pp = 0;
- pp++;
- if (has_alpha) pp++;
- }
- else
- {
- pp = pp + 3;
- if (has_alpha) pp++;
+ pp[0] = 255;
+ pp[1] = 0;
+ pp[2] = 0;
}
+ pp += p_step;
}
}
}
*-----------------------------------------------------------------------------
*/
void pixbuf_ignore_alpha_rect(GdkPixbuf *pb,
- gint x, gint y, gint w, gint h)
+ gint x, gint y, gint w, gint h)
{
gboolean has_alpha;
- gint pw, ph, prs;
+ gint pw;
+ gint ph;
+ gint prs;
guchar *p_pix;
guchar *pp;
- gint i, j;
+ gint i;
+ gint j;
if (!pb) return;
projects / geeqie.git / blobdiff