2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2005 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 struct gl_renderbuffer
*drawRb
= NULL
;
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
;
155 drawRb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[0][0];
158 quick_draw
= GL_FALSE
;
161 /* If read and draw buffer are different we must do buffer switching */
162 changeBuffer
= ctx
->Pixel
.ReadBuffer
!= ctx
->Color
.DrawBuffer
[0]
163 || ctx
->DrawBuffer
!= ctx
->ReadBuffer
;
166 /* allocate space for GLfloat image */
167 tmpImage
= (GLfloat
*) MALLOC(width
* height
* 4 * sizeof(GLfloat
));
169 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels");
172 convImage
= (GLfloat
*) MALLOC(width
* height
* 4 * sizeof(GLfloat
));
175 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels");
180 /* choose the read buffer */
181 _swrast_use_read_buffer(ctx
);
184 /* read source image */
186 for (row
= 0; row
< height
; row
++) {
187 GLchan rgba
[MAX_WIDTH
][4];
188 /* Read GLchan and convert to GLfloat */
189 _swrast_read_rgba_span(ctx
, ctx
->ReadBuffer
->_ColorReadBuffer
,
190 width
, srcx
, srcy
+ row
, rgba
);
191 chan_span_to_float(width
, (CONST
GLchan (*)[4]) rgba
,
192 (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 drawRb
->PutRow(ctx
, drawRb
, width
, destx
, dy
, span
.array
->rgba
, NULL
);
250 _swrast_write_zoomed_rgba_span(ctx
, &span
,
251 (CONST
GLchan (*)[4])span
.array
->rgba
,
258 _swrast_write_rgba_span(ctx
, &span
);
270 copy_rgba_pixels(GLcontext
*ctx
, GLint srcx
, GLint srcy
,
271 GLint width
, GLint height
, GLint destx
, GLint desty
)
273 struct gl_renderbuffer
*drawRb
;
275 GLboolean quick_draw
;
276 GLint sy
, dy
, stepy
, j
;
277 GLboolean changeBuffer
;
278 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
280 const GLuint transferOps
= ctx
->_ImageTransferState
;
283 if (!ctx
->ReadBuffer
->_ColorReadBuffer
) {
284 /* no readbuffer - OK */
288 INIT_SPAN(span
, GL_BITMAP
, 0, 0, SPAN_RGBA
);
290 if (ctx
->Pixel
.Convolution2DEnabled
|| ctx
->Pixel
.Separable2DEnabled
) {
291 copy_conv_rgba_pixels(ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
295 /* Determine if copy should be done bottom-to-top or top-to-bottom */
297 /* top-down max-to-min */
298 sy
= srcy
+ height
- 1;
299 dy
= desty
+ height
- 1;
303 /* bottom-up min-to-max */
309 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
310 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
311 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
314 overlapping
= GL_FALSE
;
318 _swrast_span_default_z(ctx
, &span
);
319 if (ctx
->Fog
.Enabled
)
320 _swrast_span_default_fog(ctx
, &span
);
322 if (SWRAST_CONTEXT(ctx
)->_RasterMask
== 0
325 && destx
+ width
<= (GLint
) ctx
->DrawBuffer
->Width
) {
326 quick_draw
= GL_TRUE
;
327 drawRb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[0][0];
330 quick_draw
= GL_FALSE
;
334 /* If read and draw buffer are different we must do buffer switching */
335 changeBuffer
= ctx
->Pixel
.ReadBuffer
!= ctx
->Color
.DrawBuffer
[0]
336 || ctx
->DrawBuffer
!= ctx
->ReadBuffer
;
340 tmpImage
= (GLchan
*) MALLOC(width
* height
* sizeof(GLchan
) * 4);
342 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
347 _swrast_use_read_buffer(ctx
);
348 /* read the source image */
350 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
351 _swrast_read_rgba_span( ctx
, ctx
->ReadBuffer
->_ColorReadBuffer
,
352 width
, srcx
, ssy
, (GLchan (*)[4]) p
);
358 _swrast_use_draw_buffer(ctx
);
359 changeBuffer
= GL_FALSE
;
363 tmpImage
= NULL
; /* silence compiler warnings */
367 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
368 /* Get source pixels */
370 /* get from buffered image */
371 ASSERT(width
< MAX_WIDTH
);
372 MEMCPY(span
.array
->rgba
, p
, width
* sizeof(GLchan
) * 4);
376 /* get from framebuffer */
378 _swrast_use_read_buffer(ctx
);
379 ASSERT(width
< MAX_WIDTH
);
380 _swrast_read_rgba_span( ctx
, ctx
->ReadBuffer
->_ColorReadBuffer
,
381 width
, srcx
, sy
, span
.array
->rgba
);
383 _swrast_use_draw_buffer(ctx
);
387 DEFMARRAY(GLfloat
, rgbaFloat
, MAX_WIDTH
, 4); /* mac 32k limitation */
388 CHECKARRAY(rgbaFloat
, return);
390 /* convert to float, transfer, convert back to chan */
391 chan_span_to_float(width
, (CONST
GLchan (*)[4]) span
.array
->rgba
,
393 _mesa_apply_rgba_transfer_ops(ctx
, transferOps
, width
, rgbaFloat
);
394 float_span_to_chan(width
, (CONST
GLfloat (*)[4]) rgbaFloat
,
397 UNDEFARRAY(rgbaFloat
); /* mac 32k limitation */
400 if (ctx
->Pixel
.PixelTextureEnabled
&& ctx
->Texture
._EnabledUnits
) {
402 _swrast_pixel_texture(ctx
, &span
);
405 /* Write color span */
406 if (quick_draw
&& dy
>= 0 && dy
< (GLint
) ctx
->DrawBuffer
->Height
) {
407 drawRb
->PutRow(ctx
, drawRb
, width
, destx
, dy
, span
.array
->rgba
, NULL
);
413 _swrast_write_zoomed_rgba_span(ctx
, &span
,
414 (CONST
GLchan (*)[4]) span
.array
->rgba
,
421 _swrast_write_rgba_span(ctx
, &span
);
431 copy_ci_pixels( GLcontext
*ctx
, GLint srcx
, GLint srcy
,
432 GLint width
, GLint height
,
433 GLint destx
, GLint desty
)
438 GLboolean changeBuffer
;
439 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
440 const GLboolean shift_or_offset
= ctx
->Pixel
.IndexShift
|| ctx
->Pixel
.IndexOffset
;
444 if (!ctx
->ReadBuffer
->_ColorReadBuffer
) {
445 /* no readbuffer - OK */
449 INIT_SPAN(span
, GL_BITMAP
, 0, 0, SPAN_INDEX
);
451 /* Determine if copy should be bottom-to-top or top-to-bottom */
453 /* top-down max-to-min */
454 sy
= srcy
+ height
- 1;
455 dy
= desty
+ height
- 1;
459 /* bottom-up min-to-max */
465 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
466 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
467 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
470 overlapping
= GL_FALSE
;
474 _swrast_span_default_z(ctx
, &span
);
475 if (ctx
->Fog
.Enabled
)
476 _swrast_span_default_fog(ctx
, &span
);
478 /* If read and draw buffer are different we must do buffer switching */
479 changeBuffer
= ctx
->Pixel
.ReadBuffer
!= ctx
->Color
.DrawBuffer
[0]
480 || ctx
->DrawBuffer
!= ctx
->ReadBuffer
;
484 tmpImage
= (GLuint
*) MALLOC(width
* height
* sizeof(GLuint
));
486 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
491 _swrast_use_read_buffer(ctx
);
494 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
495 _swrast_read_index_span( ctx
, ctx
->ReadBuffer
->_ColorReadBuffer
,
496 width
, srcx
, ssy
, p
);
500 /* restore to draw buffer */
502 _swrast_use_draw_buffer(ctx
);
503 changeBuffer
= GL_FALSE
;
507 tmpImage
= NULL
; /* silence compiler warning */
511 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
512 /* Get color indexes */
514 MEMCPY(span
.array
->index
, p
, width
* sizeof(GLuint
));
519 _swrast_use_read_buffer(ctx
);
520 _swrast_read_index_span( ctx
, ctx
->ReadBuffer
->_ColorReadBuffer
,
521 width
, srcx
, sy
, span
.array
->index
);
523 _swrast_use_draw_buffer(ctx
);
526 /* Apply shift, offset, look-up table */
527 if (shift_or_offset
) {
528 _mesa_shift_and_offset_ci( ctx
, width
, span
.array
->index
);
530 if (ctx
->Pixel
.MapColorFlag
) {
531 _mesa_map_ci( ctx
, width
, span
.array
->index
);
534 /* write color indexes */
539 _swrast_write_zoomed_index_span(ctx
, &span
, desty
, 0);
541 _swrast_write_index_span(ctx
, &span
);
554 copy_depth_pixels( GLcontext
*ctx
, GLint srcx
, GLint srcy
,
555 GLint width
, GLint height
,
556 GLint destx
, GLint desty
)
558 const GLfloat depthMax
= ctx
->DrawBuffer
->_DepthMaxF
;
559 struct gl_renderbuffer
*readRb
560 = ctx
->ReadBuffer
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
561 GLfloat
*p
, *tmpImage
;
564 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
569 /* no readbuffer - OK */
573 INIT_SPAN(span
, GL_BITMAP
, 0, 0, SPAN_Z
);
575 if (!ctx
->Visual
.depthBits
) {
576 _mesa_error( ctx
, GL_INVALID_OPERATION
, "glCopyPixels" );
580 /* Determine if copy should be bottom-to-top or top-to-bottom */
582 /* top-down max-to-min */
583 sy
= srcy
+ height
- 1;
584 dy
= desty
+ height
- 1;
588 /* bottom-up min-to-max */
594 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
595 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
596 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
599 overlapping
= GL_FALSE
;
602 _swrast_span_default_color(ctx
, &span
);
603 if (ctx
->Fog
.Enabled
)
604 _swrast_span_default_fog(ctx
, &span
);
608 tmpImage
= (GLfloat
*) MALLOC(width
* height
* sizeof(GLfloat
));
610 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
614 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
615 _swrast_read_depth_span_float(ctx
, readRb
, width
, srcx
, ssy
, p
);
621 tmpImage
= NULL
; /* silence compiler warning */
625 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
626 GLfloat depth
[MAX_WIDTH
];
628 /* get depth values */
630 MEMCPY(depth
, p
, width
* sizeof(GLfloat
));
634 _swrast_read_depth_span_float(ctx
, readRb
, width
, srcx
, sy
, depth
);
637 /* apply scale and bias */
638 for (i
= 0; i
< width
; i
++) {
639 GLfloat d
= depth
[i
] * ctx
->Pixel
.DepthScale
+ ctx
->Pixel
.DepthBias
;
641 span
.array
->z
[i
] = (GLdepth
) (CLAMP(d
, 0.0F
, 1.0F
) * depthMax
);
644 /* write depth values */
648 if (ctx
->Visual
.rgbMode
) {
650 _swrast_write_zoomed_rgba_span( ctx
, &span
,
651 (const GLchan (*)[4])span
.array
->rgba
, desty
, 0 );
653 _swrast_write_rgba_span(ctx
, &span
);
657 _swrast_write_zoomed_index_span( ctx
, &span
, desty
, 0 );
659 _swrast_write_index_span(ctx
, &span
);
670 copy_stencil_pixels( GLcontext
*ctx
, GLint srcx
, GLint srcy
,
671 GLint width
, GLint height
,
672 GLint destx
, GLint desty
)
674 struct gl_renderbuffer
*rb
675 = ctx
->ReadBuffer
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
678 GLstencil
*p
, *tmpImage
;
679 const GLboolean zoom
= ctx
->Pixel
.ZoomX
!= 1.0F
|| ctx
->Pixel
.ZoomY
!= 1.0F
;
680 const GLboolean shift_or_offset
= ctx
->Pixel
.IndexShift
|| ctx
->Pixel
.IndexOffset
;
683 if (!ctx
->Visual
.stencilBits
) {
684 _mesa_error( ctx
, GL_INVALID_OPERATION
, "glCopyPixels" );
689 /* no readbuffer - OK */
693 /* Determine if copy should be bottom-to-top or top-to-bottom */
695 /* top-down max-to-min */
696 sy
= srcy
+ height
- 1;
697 dy
= desty
+ height
- 1;
701 /* bottom-up min-to-max */
707 if (ctx
->DrawBuffer
== ctx
->ReadBuffer
) {
708 overlapping
= regions_overlap(srcx
, srcy
, destx
, desty
, width
, height
,
709 ctx
->Pixel
.ZoomX
, ctx
->Pixel
.ZoomY
);
712 overlapping
= GL_FALSE
;
717 tmpImage
= (GLstencil
*) MALLOC(width
* height
* sizeof(GLstencil
));
719 _mesa_error( ctx
, GL_OUT_OF_MEMORY
, "glCopyPixels" );
723 for (j
= 0; j
< height
; j
++, ssy
+= stepy
) {
724 _swrast_read_stencil_span( ctx
, rb
, width
, srcx
, ssy
, p
);
730 tmpImage
= NULL
; /* silence compiler warning */
734 for (j
= 0; j
< height
; j
++, sy
+= stepy
, dy
+= stepy
) {
735 GLstencil stencil
[MAX_WIDTH
];
737 /* Get stencil values */
739 MEMCPY(stencil
, p
, width
* sizeof(GLstencil
));
743 _swrast_read_stencil_span( ctx
, rb
, width
, srcx
, sy
, stencil
);
746 /* Apply shift, offset, look-up table */
747 if (shift_or_offset
) {
748 _mesa_shift_and_offset_stencil( ctx
, width
, stencil
);
750 if (ctx
->Pixel
.MapStencilFlag
) {
751 _mesa_map_stencil( ctx
, width
, stencil
);
754 /* Write stencil values */
756 _swrast_write_zoomed_stencil_span( ctx
, width
, destx
, dy
,
760 _swrast_write_stencil_span( ctx
, width
, destx
, dy
, stencil
);
771 _swrast_CopyPixels( GLcontext
*ctx
,
772 GLint srcx
, GLint srcy
, GLsizei width
, GLsizei height
,
773 GLint destx
, GLint desty
,
776 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
777 RENDER_START(swrast
,ctx
);
779 if (swrast
->NewState
)
780 _swrast_validate_derived( ctx
);
782 if (type
== GL_COLOR
&& ctx
->Visual
.rgbMode
) {
783 copy_rgba_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
785 else if (type
== GL_COLOR
&& !ctx
->Visual
.rgbMode
) {
786 copy_ci_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
788 else if (type
== GL_DEPTH
) {
789 copy_depth_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
791 else if (type
== GL_STENCIL
) {
792 copy_stencil_pixels( ctx
, srcx
, srcy
, width
, height
, destx
, desty
);
795 _mesa_error( ctx
, GL_INVALID_ENUM
, "glCopyPixels" );
798 RENDER_FINISH(swrast
,ctx
);