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Image editor: Add options to display separate R, G and B channels 

Works totally similar to backdrop in the compositor.

Requested by Sean Kennedy, but could be useful for lots for VFX guys.

Reviewers: campbellbarton

Reviewed By: campbellbarton

Subscribers: sebastian_k, hype

Differential Revision: https://developer.blender.org/D1590
This commit is contained in:
Sergey Sharybin 2015-10-30 16:06:00 +05:00
parent e6abc3ad57
commit 43bf78c946
Notes: blender-bot 2023-02-14 09:44:56 +01:00 
Referenced by issue #46647, Extrude Individual Faces + tweak in Last Operator panel = Crash
Referenced by issue #46648, "Recalculate Normals" operator (on creating outside normals) non-functional on certain geometric volumes.
3 changed files with 57 additions and 4 deletions
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48
source/blender/editors/space_image/image_draw.c
View File

@ -478,6 +478,19 @@ static void sima_draw_zbuffloat_pixels(Scene *scene, float x1, float y1, int rec
MEM_freeN(rectf);
}
static int draw_image_channel_offset(SpaceImage *sima)
{
#ifdef __BIG_ENDIAN__
if (sima->flag & SI_SHOW_R) return 2;
else if (sima->flag & SI_SHOW_G) return 1;
else return 0;
#else
if (sima->flag & SI_SHOW_R) return 1;
else if (sima->flag & SI_SHOW_G) return 2;
else return 3;
#endif
}
static void draw_image_buffer(const bContext *C, SpaceImage *sima, ARegion *ar, Scene *scene, ImBuf *ibuf, float fx, float fy, float zoomx, float zoomy)
{
int x, y;
@ -513,7 +526,27 @@ static void draw_image_buffer(const bContext *C, SpaceImage *sima, ARegion *ar,
fdrawcheckerboard(x, y, x + ibuf->x * zoomx, y + ibuf->y * zoomy);
}
glaDrawImBuf_glsl_ctx(C, ibuf, x, y, GL_NEAREST);
if ((sima->flag & (SI_SHOW_R | SI_SHOW_G | SI_SHOW_B)) == 0) {
glaDrawImBuf_glsl_ctx(C, ibuf, x, y, GL_NEAREST);
}
else {
unsigned char *display_buffer;
void *cache_handle;
/* TODO(sergey): Ideally GLSL shading should be capable of either
* disabling some channels or displaying buffer with custom offset.
*/
display_buffer = IMB_display_buffer_acquire_ctx(C, ibuf, &cache_handle);
if (display_buffer != NULL) {
int channel_offset = draw_image_channel_offset(sima);
glaDrawPixelsSafe(x, y, ibuf->x, ibuf->y, ibuf->x, GL_LUMINANCE, GL_UNSIGNED_INT,
display_buffer + channel_offset);
}
if (cache_handle != NULL) {
IMB_display_buffer_release(cache_handle);
}
}
if (sima->flag & SI_USE_ALPHA)
glDisable(GL_BLEND);
@ -551,6 +584,7 @@ static void draw_image_buffer_tiled(SpaceImage *sima, ARegion *ar, Scene *scene,
unsigned int *rect;
int dx, dy, sx, sy, x, y;
void *cache_handle;
int channel_offset = -1;
/* verify valid values, just leave this a while */
if (ima->xrep < 1) return;
@ -577,11 +611,19 @@ static void draw_image_buffer_tiled(SpaceImage *sima, ARegion *ar, Scene *scene,
rect = get_part_from_buffer((unsigned int *)display_buffer, ibuf->x, sx, sy, sx + dx, sy + dy);
/* draw repeated */
if ((sima->flag & (SI_SHOW_R | SI_SHOW_G | SI_SHOW_B)) != 0) {
channel_offset = draw_image_channel_offset(sima);
}
for (sy = 0; sy + dy <= ibuf->y; sy += dy) {
for (sx = 0; sx + dx <= ibuf->x; sx += dx) {
UI_view2d_view_to_region(&ar->v2d, fx + (float)sx / (float)ibuf->x, fy + (float)sy / (float)ibuf->y, &x, &y);
glaDrawPixelsSafe(x, y, dx, dy, dx, GL_RGBA, GL_UNSIGNED_BYTE, rect);
if (channel_offset == -1) {
glaDrawPixelsSafe(x, y, dx, dy, dx, GL_RGBA, GL_UNSIGNED_BYTE, rect);
}
else {
glaDrawPixelsSafe(x, y, dx, dy, dx, GL_LUMINANCE, GL_UNSIGNED_INT,
(unsigned char*)rect + channel_offset);
}
}
}

6
source/blender/makesdna/DNA_space_types.h
View File

@ -966,7 +966,11 @@ typedef enum eSpaceImage_Flag {
SI_COLOR_CORRECTION = (1 << 24),
SI_NO_DRAW_TEXPAINT = (1 << 25),
SI_DRAW_METADATA = (1 << 26)
SI_DRAW_METADATA = (1 << 26),
SI_SHOW_R = (1 << 27),
SI_SHOW_G = (1 << 28),
SI_SHOW_B = (1 << 29),
} eSpaceImage_Flag;
/* Text Editor ============================================ */

7
source/blender/makesrna/intern/rna_space.c
View File

@ -142,6 +142,9 @@ static EnumPropertyItem draw_channels_items[] = {
{SI_SHOW_ALPHA, "ALPHA", ICON_IMAGE_ALPHA, "Alpha", "Draw alpha transparency channel"},
{SI_SHOW_ZBUF, "Z_BUFFER", ICON_IMAGE_ZDEPTH, "Z-Buffer",
"Draw Z-buffer associated with image (mapped from camera clip start to end)"},
{SI_SHOW_R, "RED", ICON_COLOR_RED, "Red", ""},
{SI_SHOW_G, "GREEN", ICON_COLOR_GREEN, "Green", ""},
{SI_SHOW_B, "BLUE", ICON_COLOR_BLUE, "Blue", ""},
{0, NULL, 0, NULL, NULL}
};
@ -838,6 +841,10 @@ static EnumPropertyItem *rna_SpaceImageEditor_draw_channels_itemf(bContext *UNUS
RNA_enum_items_add_value(&item, &totitem, draw_channels_items, 0);
}
RNA_enum_items_add_value(&item, &totitem, draw_channels_items, SI_SHOW_R);
RNA_enum_items_add_value(&item, &totitem, draw_channels_items, SI_SHOW_G);
RNA_enum_items_add_value(&item, &totitem, draw_channels_items, SI_SHOW_B);
RNA_enum_item_end(&item, &totitem);
*r_free = true;