author | Tero Marttila <terom@fixme.fi> |
Tue, 17 Jun 2008 16:39:55 +0300 | |
changeset 19 | d18606bb6f20 |
parent 18 | 86f2e5b7191b |
permissions | -rw-r--r-- |
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#ifndef RENDER_SLICES_H |
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#define RENDER_SLICES_H |
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#include "render.h" |
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#define RENDER_SLICES_MAX 2 |
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struct render_slices; |
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|
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struct render_slice_info { |
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// our index |
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size_t index; |
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|
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// the render info |
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struct render *render_info; |
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|
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// where to put the pixel data |
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unsigned char *render_buf; |
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}; |
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/* |
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* Split the given render operation into multiple slices that can be rendered |
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* induvidually. |
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* |
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* A segment is a single row of a slice. The raw pixel data for each segment |
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* should be stored into the render_buf item in that slice's render_slice_info. |
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* When a full segment has been stored into the render_buf, you should call |
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* render_slices_segment_done with that slice's index as an argument, and then |
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* proceed based on its return code. |
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* |
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* Returns a struct render_slices handle which can be used to operate on the |
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* slices, or NULL on failure. |
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*/ |
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struct render_slices *render_slices_alloc (struct render *render); |
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/* |
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* Get the number of slices that need to be rendered, which is also the valid |
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* range of index values for render_slices_get_slice_info. |
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*/ |
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int render_slices_get_count (struct render_slices *ctx); |
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/* |
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* Get the struct render_slice_info corresponding to the given index. This |
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* the information required to render the segment. The index is used as an |
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* argument to render_slices_segment_done. |
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*/ |
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struct render_slice_info *render_slices_get_slice_info (struct render_slices *ctx, int index); |
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/* |
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* You may call render_slices_segment_done again for any slice now, including |
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* those which returned ~SLICE_CONTINUE earlier. |
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*/ |
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#define SLICE_CONTINUE 0x01 |
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/* |
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* You may call render_slices_process_row next. |
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*/ |
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#define SLICE_PROCESS_ROW 0x02 |
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// XXX: you can't modify the slice's row buffer until these return SLICE_CONTINUE |
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/* |
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* The render_buf for the render_slice_info with the given index value contains |
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* the full information for the next row of the render_info render. Returns a |
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* bitwise-OR of the SLICE_* flags, or -1 for an error: |
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* |
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* Valid return values: |
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* zero |
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* Do not call segment_done for this index, or process_row right now. |
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* Information for some slice needed to complete the next row is missing, |
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* and the other segments must call segment_done first. |
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* |
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* SLICE_PROCESS_ROW |
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* Do not call segment_done for this index or any others, but do call |
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* process_row as soon as possible, and then continue once it returns |
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* (see render_slices_process_row). |
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* |
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* SLICE_CONTINUE & SLICE_PROCESS_ROW |
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* You should call process_row next, but you can also call segment_done |
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* for all segments that returned ~SLICE_CONTINUE earlier. |
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* |
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* -1 - An error occured. Rendering must be aborted. |
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* |
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*/ |
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int render_slices_segment_done (struct render_slices *ctx, int index); |
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86 |
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/* |
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* Process a completed row and generate output in the PNG format (how that is |
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89 |
* handled depends on the render given to render_slices_alloc/init). Returns a |
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90 |
* bitwise-OR of the SLICE_* flags, or -1 for an error: |
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91 |
* |
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92 |
* Valid return values : |
8e8b56b0e0f5
a half-working render_slices. Render_multi is currently semantically broken/buggy, but it's time to go to sleep
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93 |
* zero |
8e8b56b0e0f5
a half-working render_slices. Render_multi is currently semantically broken/buggy, but it's time to go to sleep
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parents:
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94 |
* The PNG is done - you don't need to call segment_done or process_row |
8e8b56b0e0f5
a half-working render_slices. Render_multi is currently semantically broken/buggy, but it's time to go to sleep
Tero Marttila <terom@fixme.fi>
parents:
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95 |
* anymore, doing so will result in an error. You don't need to deinit |
8e8b56b0e0f5
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parents:
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96 |
* ctx, but you may need to free it. |
8e8b56b0e0f5
a half-working render_slices. Render_multi is currently semantically broken/buggy, but it's time to go to sleep
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parents:
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97 |
* |
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98 |
* SLICE_CONTINUE |
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99 |
* You may call render_slices_segment_done again for those slices that |
8e8b56b0e0f5
a half-working render_slices. Render_multi is currently semantically broken/buggy, but it's time to go to sleep
Tero Marttila <terom@fixme.fi>
parents:
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100 |
* returned ~SLICE_CONTINUE earlier. |
8e8b56b0e0f5
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parents:
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101 |
* |
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102 |
* SLICE_CONTINUE & SLICE_PROCESS_ROW |
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103 |
* In addition to calling render_slices_segment_done again, you may also |
8e8b56b0e0f5
a half-working render_slices. Render_multi is currently semantically broken/buggy, but it's time to go to sleep
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parents:
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104 |
* call render_slices_process_row again. |
8e8b56b0e0f5
a half-working render_slices. Render_multi is currently semantically broken/buggy, but it's time to go to sleep
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parents:
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105 |
* |
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106 |
* -1 - An error occured. Rendering must be aborted. |
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107 |
*/ |
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108 |
int render_slices_process_row (struct render_slices *ctx); |
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109 |
|
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110 |
/* |
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111 |
* Signifiy that the render has been completed. This will flush out buffered |
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render_multi uses render_slices now, and seems to work
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112 |
* output data. |
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113 |
*/ |
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114 |
int render_slices_done (struct render_slices *ctx); |
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115 |
|
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116 |
/* |
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parents:
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117 |
* Free a render_slices. The rendering may or may not be complete. |
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parents:
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118 |
*/ |
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119 |
void render_slices_free (struct render_slices *ctx); |
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120 |
|
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121 |
#endif /* RENDER_SLICES_H */ |