121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
// 27 june 2016
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#include "uipriv_unix.h"
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struct uiImage {
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double width;
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double height;
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GPtrArray *images;
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};
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static void freeImageRep(gpointer item)
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{
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cairo_surface_t *cs = (cairo_surface_t *) item;
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unsigned char *buf;
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buf = cairo_image_surface_get_data(cs);
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cairo_surface_destroy(cs);
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uiprivFree(buf);
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}
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uiImage *uiNewImage(double width, double height)
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{
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uiImage *i;
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i = uiprivNew(uiImage);
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i->width = width;
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i->height = height;
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i->images = g_ptr_array_new_with_free_func(freeImageRep);
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return i;
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}
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void uiFreeImage(uiImage *i)
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{
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g_ptr_array_free(i->images, TRUE);
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uiprivFree(i);
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}
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void uiImageAppend(uiImage *i, void *pixels, int pixelWidth, int pixelHeight, int pixelStride)
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{
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cairo_surface_t *cs;
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unsigned char *buf, *p;
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uint8_t *src = (uint8_t *) pixels;
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int cstride;
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int y;
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cstride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, pixelWidth);
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buf = (unsigned char *) uiprivAlloc((cstride * pixelHeight * 4) * sizeof (unsigned char), "unsigned char[]");
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p = buf;
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for (y = 0; y < pixelStride * pixelHeight; y += pixelStride) {
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memmove(p, src + y, cstride);
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p += cstride;
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}
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cs = cairo_image_surface_create_for_data(buf, CAIRO_FORMAT_ARGB32,
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pixelWidth, pixelHeight,
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cstride);
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if (cairo_surface_status(cs) != CAIRO_STATUS_SUCCESS)
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/* TODO */;
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cairo_surface_flush(cs);
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g_ptr_array_add(i->images, cs);
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}
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struct matcher {
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cairo_surface_t *best;
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int distX;
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int distY;
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int targetX;
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int targetY;
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gboolean foundLarger;
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};
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// TODO is this the right algorithm?
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static void match(gpointer surface, gpointer data)
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{
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cairo_surface_t *cs = (cairo_surface_t *) surface;
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struct matcher *m = (struct matcher *) data;
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int x, y;
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int x2, y2;
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x = cairo_image_surface_get_width(cs);
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y = cairo_image_surface_get_height(cs);
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if (m->best == NULL)
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goto writeMatch;
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if (x < m->targetX && y < m->targetY)
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if (m->foundLarger)
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// always prefer larger ones
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return;
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if (x >= m->targetX && y >= m->targetY && !m->foundLarger)
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// we set foundLarger below
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goto writeMatch;
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x2 = abs(m->targetX - x);
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y2 = abs(m->targetY - y);
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if (x2 < m->distX && y2 < m->distY)
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goto writeMatch;
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// TODO weight one dimension? threshhold?
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return;
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writeMatch:
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// must set this here too; otherwise the first image will never have ths set
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if (x >= m->targetX && y >= m->targetY && !m->foundLarger)
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m->foundLarger = TRUE;
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m->best = cs;
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m->distX = abs(m->targetX - x);
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m->distY = abs(m->targetY - y);
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}
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cairo_surface_t *imageAppropriateSurface(uiImage *i, GtkWidget *w)
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{
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struct matcher m;
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m.best = NULL;
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m.distX = G_MAXINT;
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m.distY = G_MAXINT;
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m.targetX = i->width * gtk_widget_get_scale_factor(w);
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m.targetY = i->height * gtk_widget_get_scale_factor(w);
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m.foundLarger = FALSE;
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g_ptr_array_foreach(i->images, match, &m);
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return m.best;
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}
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