2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 #include "histogram.h"
36 #include "s_context.h"
38 #include "s_pixeltex.h"
40 #include "s_stencil.h"
41 #include "s_texture.h"
47 * Determine if there's overlap in an image copy.
48 * This test also compensates for the fact that copies are done from
49 * bottom to top and overlaps can sometimes be handled correctly
50 * without making a temporary image copy.
53 regions_overlap(GLint srcx
, GLint srcy
,
54 GLint dstx
, GLint dsty
,
55 GLint width
, GLint height
,
56 GLfloat zoomX
, GLfloat zoomY
)
58 if (zoomX
== 1.0 && zoomY
== 1.0) {
60 if (srcx
>= dstx
+ width
|| (srcx
+ width
<= dstx
)) {
63 else if (srcy
< dsty
) { /* this is OK */
66 else if (srcy
> dsty
+ height
) {
74 /* add one pixel of slop when zooming, just to be safe */
75 if ((srcx
> dstx
+ (width
* zoomX
) + 1) || (srcx
+ width
+ 1 < dstx
)) {
78 else if ((srcy
< dsty
) && (srcy
+ height
< dsty
+ (height
* zoomY
))) {
81 else if ((srcy
> dsty
) && (srcy
+ height
> dsty
+ (height
* zoomY
))) {
92 * Convert GLfloat[n][4] colors to GLchan[n][4].
93 * XXX maybe move into image.c
96 float_span_to_chan(GLuint n
, CONST GLfloat in
[][4], GLchan out
[][4])
99 for (i
= 0; i
< n
; i
++) {
100 UNCLAMPED_FLOAT_TO_CHAN(out
[i
][RCOMP
], in
[i
][RCOMP
]);
101 UNCLAMPED_FLOAT_TO_CHAN(out
[i
][GCOMP
], in
[i
][GCOMP
]);
102 UNCLAMPED_FLOAT_TO_CHAN(out
[i
][BCOMP
], in
[i
][BCOMP
]);
103 UNCLAMPED_FLOAT_TO_CHAN(out
[i
][ACOMP
], in
[i
][ACOMP
]);
109 * Convert GLchan[n][4] colors to GLfloat[n][4].
110 * XXX maybe move into image.c
113 chan_span_to_float(GLuint n
, CONST GLchan in
[][4], GLfloat out
[][4])
116 for (i
= 0; i
< n
; i
++) {
117 out
[i
][RCOMP
] = CHAN_TO_FLOAT(in
[i
][RCOMP
]);
118 out
[i
][GCOMP
] = CHAN_TO_FLOAT(in
[i
][GCOMP
]);
119 out
[i
][BCOMP
] = CHAN_TO_FLOAT(in
[i
][BCOMP
]);
120 out
[i
][ACOMP
] = CHAN_TO_FLOAT(in
[i
][ACOMP
]);
127 * RGBA copypixels with convolution.
130 copy_conv_rgba_pixels(GLcontext
*ctx
, GLint srcx
, GLint srcy
,
131 GLint width
, GLint height
, GLint destx
, GLint desty
)
133 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
134 GLboolean quick_draw
;
136 GLboolean changeBuffer
;
137 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
138 const GLuint transferOps
= ctx
->_ImageTransferState
;
139 GLfloat
*dest
, *tmpImage
, *convImage
;
142 INIT_SPAN(span
, GL_BITMAP
, 0, 0, SPAN_RGBA
);
145 _swrast_span_default_z(ctx
, &span
);
146 if (ctx
->Fog
.Enabled
)
147 _swrast_span_default_fog(ctx
, &span
);
150 if (SWRAST_CONTEXT(ctx
)->_RasterMask
== 0
153 && destx
+ width
<= (GLint
) ctx
->DrawBuffer
->Width
) {
154 quick_draw
= GL_TRUE
;
157 quick_draw
= GL_FALSE
;
160 /* If read and draw buffer are different we must do buffer switching */
161 changeBuffer
= ctx
->Pixel
.ReadBuffer
!= ctx
->Color
.DrawBuffer
162 || ctx
->DrawBuffer
!= ctx
->ReadBuffer
;
165 /* allocate space for GLfloat image */
166 tmpImage
= (GLfloat
*) MALLOC(width
* height
* 4 * sizeof(GLfloat
));
168 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels");
171 convImage
= (GLfloat
*) MALLOC(width
* height
* 4 * sizeof(GLfloat
));
174 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels");
181 /* choose the read buffer */
182 _swrast_use_read_buffer(ctx
);
185 /* read source image */
187 for (row
= 0; row
< height
; row
++) {
188 GLchan rgba
[MAX_WIDTH
][4];
189 /* Read GLchan and convert to GLfloat */
190 _swrast_read_rgba_span(ctx
, ctx
->ReadBuffer
, width
, srcx
,
192 chan_span_to_float(width
, (CONST
GLchan (*)[4]) rgba
,
193 (GLfloat (*)[4]) dest
);
197 /* restore default src/dst buffer */
198 _swrast_use_draw_buffer(ctx
);
201 /* do the image transfer ops which preceed convolution */
202 for (row
= 0; row
< height
; row
++) {
203 GLfloat (*rgba
)[4] = (GLfloat (*)[4]) (tmpImage
+ row
* width
* 4);
204 _mesa_apply_rgba_transfer_ops(ctx
,
205 transferOps
& IMAGE_PRE_CONVOLUTION_BITS
,
210 if (ctx
->Pixel
.Convolution2DEnabled
) {
211 _mesa_convolve_2d_image(ctx
, &width
, &height
, tmpImage
, convImage
);
214 ASSERT(ctx
->Pixel
.Separable2DEnabled
);
215 _mesa_convolve_sep_image(ctx
, &width
, &height
, tmpImage
, convImage
);
219 /* do remaining post-convolution image transfer ops */
220 for (row
= 0; row
< height
; row
++) {
221 GLfloat (*rgba
)[4] = (GLfloat (*)[4]) (convImage
+ row
* width
* 4);
222 _mesa_apply_rgba_transfer_ops(ctx
,
223 transferOps
& IMAGE_POST_CONVOLUTION_BITS
,
227 /* write the new image */
228 for (row
= 0; row
< height
; row
++) {
229 const GLfloat
*src
= convImage
+ row
* width
* 4;
232 /* convert floats back to chan */
233 float_span_to_chan(width
, (const GLfloat (*)[4]) src
, span
.array
->rgba
);
235 if (ctx
->Pixel
.PixelTextureEnabled
&& ctx
->Texture
._EnabledUnits
) {
237 _swrast_pixel_texture(ctx
, &span
);
240 /* write row to framebuffer */
243 if (quick_draw
&& dy
>= 0 && dy
< (GLint
) ctx
->DrawBuffer
->Height
) {
244 (*swrast
->Driver
.WriteRGBASpan
)( ctx
, width
, destx
, dy
,
245 (const GLchan (*)[4])span
.array
->rgba
, NULL
);
251 _swrast_write_zoomed_rgba_span(ctx
, &span
,
252 (CONST
GLchan (*)[4])span
.array
->rgba
,
259 _swrast_write_rgba_span(ctx
, &span
);
271 copy_rgba_pixels(GLcontext
*ctx
, GLint srcx
, GLint srcy
,
272 GLint width
, GLint height
, GLint destx
, GLint desty
)
274 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
276 GLboolean quick_draw
;
277 GLint sy
, dy
, stepy
, j
;
278 GLboolean changeBuffer
;
279 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
281 const GLuint transferOps
= ctx
->_ImageTransferState
;
284 INIT_SPAN(span
, GL_BITMAP
, 0, 0, SPAN_RGBA
);
286 if (ctx
->Pixel
.Convolution2DEnabled
|| ctx
->Pixel
.Separable2DEnabled
) {
287 copy_conv_rgba_pixels(ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
291 /* Determine if copy should be done bottom-to-top or top-to-bottom */
293 /* top-down max-to-min */
294 sy
= srcy
+ height
- 1;
295 dy
= desty
+ height
- 1;
299 /* bottom-up min-to-max */
305 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
306 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
307 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
310 overlapping
= GL_FALSE
;
314 _swrast_span_default_z(ctx
, &span
);
315 if (ctx
->Fog
.Enabled
)
316 _swrast_span_default_fog(ctx
, &span
);
318 if (SWRAST_CONTEXT(ctx
)->_RasterMask
== 0
321 && destx
+ width
<= (GLint
) ctx
->DrawBuffer
->Width
) {
322 quick_draw
= GL_TRUE
;
325 quick_draw
= GL_FALSE
;
328 /* If read and draw buffer are different we must do buffer switching */
329 changeBuffer
= ctx
->Pixel
.ReadBuffer
!= ctx
->Color
.DrawBuffer
330 || ctx
->DrawBuffer
!= ctx
->ReadBuffer
;
334 tmpImage
= (GLchan
*) MALLOC(width
* height
* sizeof(GLchan
) * 4);
336 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
341 _swrast_use_read_buffer(ctx
);
342 /* read the source image */
344 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
345 _swrast_read_rgba_span( ctx
, ctx
->ReadBuffer
, width
, srcx
, ssy
,
352 _swrast_use_draw_buffer(ctx
);
353 changeBuffer
= GL_FALSE
;
357 tmpImage
= NULL
; /* silence compiler warnings */
361 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
362 /* Get source pixels */
364 /* get from buffered image */
365 ASSERT(width
< MAX_WIDTH
);
366 MEMCPY(span
.array
->rgba
, p
, width
* sizeof(GLchan
) * 4);
370 /* get from framebuffer */
372 _swrast_use_read_buffer(ctx
);
373 ASSERT(width
< MAX_WIDTH
);
374 _swrast_read_rgba_span( ctx
, ctx
->ReadBuffer
, width
, srcx
, sy
,
377 _swrast_use_draw_buffer(ctx
);
381 DEFMARRAY(GLfloat
, rgbaFloat
, MAX_WIDTH
, 4); /* mac 32k limitation */
382 CHECKARRAY(rgbaFloat
, return);
384 /* convert to float, transfer, convert back to chan */
385 chan_span_to_float(width
, (CONST
GLchan (*)[4]) span
.array
->rgba
,
387 _mesa_apply_rgba_transfer_ops(ctx
, transferOps
, width
, rgbaFloat
);
388 float_span_to_chan(width
, (CONST
GLfloat (*)[4]) rgbaFloat
,
391 UNDEFARRAY(rgbaFloat
); /* mac 32k limitation */
394 if (ctx
->Pixel
.PixelTextureEnabled
&& ctx
->Texture
._EnabledUnits
) {
396 _swrast_pixel_texture(ctx
, &span
);
399 /* Write color span */
400 if (quick_draw
&& dy
>= 0 && dy
< (GLint
) ctx
->DrawBuffer
->Height
) {
401 (*swrast
->Driver
.WriteRGBASpan
)( ctx
, width
, destx
, dy
,
402 (const GLchan (*)[4])span
.array
->rgba
, NULL
);
408 _swrast_write_zoomed_rgba_span(ctx
, &span
,
409 (CONST
GLchan (*)[4]) span
.array
->rgba
,
416 _swrast_write_rgba_span(ctx
, &span
);
426 copy_ci_pixels( GLcontext
*ctx
, GLint srcx
, GLint srcy
,
427 GLint width
, GLint height
,
428 GLint destx
, GLint desty
)
433 GLboolean changeBuffer
;
434 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
435 const GLboolean shift_or_offset
= ctx
->Pixel
.IndexShift
|| ctx
->Pixel
.IndexOffset
;
439 INIT_SPAN(span
, GL_BITMAP
, 0, 0, SPAN_INDEX
);
441 /* Determine if copy should be bottom-to-top or top-to-bottom */
443 /* top-down max-to-min */
444 sy
= srcy
+ height
- 1;
445 dy
= desty
+ height
- 1;
449 /* bottom-up min-to-max */
455 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
456 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
457 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
460 overlapping
= GL_FALSE
;
464 _swrast_span_default_z(ctx
, &span
);
465 if (ctx
->Fog
.Enabled
)
466 _swrast_span_default_fog(ctx
, &span
);
468 /* If read and draw buffer are different we must do buffer switching */
469 changeBuffer
= ctx
->Pixel
.ReadBuffer
!= ctx
->Color
.DrawBuffer
470 || ctx
->DrawBuffer
!= ctx
->ReadBuffer
;
474 tmpImage
= (GLuint
*) MALLOC(width
* height
* sizeof(GLuint
));
476 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
481 _swrast_use_read_buffer(ctx
);
484 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
485 _swrast_read_index_span( ctx
, ctx
->ReadBuffer
, width
, srcx
, ssy
, p
);
489 /* restore to draw buffer */
491 _swrast_use_draw_buffer(ctx
);
492 changeBuffer
= GL_FALSE
;
496 tmpImage
= NULL
; /* silence compiler warning */
500 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
501 /* Get color indexes */
503 MEMCPY(span
.array
->index
, p
, width
* sizeof(GLuint
));
508 _swrast_use_read_buffer(ctx
);
509 _swrast_read_index_span( ctx
, ctx
->ReadBuffer
, width
, srcx
, sy
,
512 _swrast_use_draw_buffer(ctx
);
515 /* Apply shift, offset, look-up table */
516 if (shift_or_offset
) {
517 _mesa_shift_and_offset_ci( ctx
, width
, span
.array
->index
);
519 if (ctx
->Pixel
.MapColorFlag
) {
520 _mesa_map_ci( ctx
, width
, span
.array
->index
);
523 /* write color indexes */
528 _swrast_write_zoomed_index_span(ctx
, &span
, desty
, 0);
530 _swrast_write_index_span(ctx
, &span
);
543 copy_depth_pixels( GLcontext
*ctx
, GLint srcx
, GLint srcy
,
544 GLint width
, GLint height
,
545 GLint destx
, GLint desty
)
547 GLfloat
*p
, *tmpImage
;
550 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
554 INIT_SPAN(span
, GL_BITMAP
, 0, 0, SPAN_Z
);
556 if (!ctx
->Visual
.depthBits
) {
557 _mesa_error( ctx
, GL_INVALID_OPERATION
, "glCopyPixels" );
561 /* Determine if copy should be bottom-to-top or top-to-bottom */
563 /* top-down max-to-min */
564 sy
= srcy
+ height
- 1;
565 dy
= desty
+ height
- 1;
569 /* bottom-up min-to-max */
575 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
576 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
577 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
580 overlapping
= GL_FALSE
;
583 _swrast_span_default_color(ctx
, &span
);
584 if (ctx
->Fog
.Enabled
)
585 _swrast_span_default_fog(ctx
, &span
);
589 tmpImage
= (GLfloat
*) MALLOC(width
* height
* sizeof(GLfloat
));
591 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
595 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
596 _swrast_read_depth_span_float(ctx
, width
, srcx
, ssy
, p
);
602 tmpImage
= NULL
; /* silence compiler warning */
606 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
607 GLfloat depth
[MAX_WIDTH
];
609 /* get depth values */
611 MEMCPY(depth
, p
, width
* sizeof(GLfloat
));
615 _swrast_read_depth_span_float(ctx
, width
, srcx
, sy
, depth
);
618 /* apply scale and bias */
619 for (i
= 0; i
< width
; i
++) {
620 GLfloat d
= depth
[i
] * ctx
->Pixel
.DepthScale
+ ctx
->Pixel
.DepthBias
;
621 span
.array
->z
[i
] = (GLdepth
) (CLAMP(d
, 0.0F
, 1.0F
) * ctx
->DepthMax
);
624 /* write depth values */
628 if (ctx
->Visual
.rgbMode
) {
630 _swrast_write_zoomed_rgba_span( ctx
, &span
,
631 (const GLchan (*)[4])span
.array
->rgba
, desty
, 0 );
633 _swrast_write_rgba_span(ctx
, &span
);
637 _swrast_write_zoomed_index_span( ctx
, &span
, desty
, 0 );
639 _swrast_write_index_span(ctx
, &span
);
650 copy_stencil_pixels( GLcontext
*ctx
, GLint srcx
, GLint srcy
,
651 GLint width
, GLint height
,
652 GLint destx
, GLint desty
)
656 GLstencil
*p
, *tmpImage
;
657 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
658 const GLboolean shift_or_offset
= ctx
->Pixel
.IndexShift
|| ctx
->Pixel
.IndexOffset
;
661 if (!ctx
->Visual
.stencilBits
) {
662 _mesa_error( ctx
, GL_INVALID_OPERATION
, "glCopyPixels" );
666 /* Determine if copy should be bottom-to-top or top-to-bottom */
668 /* top-down max-to-min */
669 sy
= srcy
+ height
- 1;
670 dy
= desty
+ height
- 1;
674 /* bottom-up min-to-max */
680 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
681 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
682 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
685 overlapping
= GL_FALSE
;
690 tmpImage
= (GLstencil
*) MALLOC(width
* height
* sizeof(GLstencil
));
692 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
696 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
697 _swrast_read_stencil_span( ctx
, width
, srcx
, ssy
, p
);
703 tmpImage
= NULL
; /* silence compiler warning */
707 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
708 GLstencil stencil
[MAX_WIDTH
];
710 /* Get stencil values */
712 MEMCPY(stencil
, p
, width
* sizeof(GLstencil
));
716 _swrast_read_stencil_span( ctx
, width
, srcx
, sy
, stencil
);
719 /* Apply shift, offset, look-up table */
720 if (shift_or_offset
) {
721 _mesa_shift_and_offset_stencil( ctx
, width
, stencil
);
723 if (ctx
->Pixel
.MapStencilFlag
) {
724 _mesa_map_stencil( ctx
, width
, stencil
);
727 /* Write stencil values */
729 _swrast_write_zoomed_stencil_span( ctx
, width
, destx
, dy
,
733 _swrast_write_stencil_span( ctx
, width
, destx
, dy
, stencil
);
744 _swrast_CopyPixels( GLcontext
*ctx
,
745 GLint srcx
, GLint srcy
, GLsizei width
, GLsizei height
,
746 GLint destx
, GLint desty
,
749 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
750 RENDER_START(swrast
,ctx
);
752 if (swrast
->NewState
)
753 _swrast_validate_derived( ctx
);
755 if (type
== GL_COLOR
&& ctx
->Visual
.rgbMode
) {
756 copy_rgba_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
758 else if (type
== GL_COLOR
&& !ctx
->Visual
.rgbMode
) {
759 copy_ci_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
761 else if (type
== GL_DEPTH
) {
762 copy_depth_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
764 else if (type
== GL_STENCIL
) {
765 copy_stencil_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
768 _mesa_error( ctx
, GL_INVALID_ENUM
, "glCopyPixels" );
771 RENDER_FINISH(swrast
,ctx
);