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author | Jaakko Keränen <jaakko.keranen@iki.fi> | 2020-09-12 09:48:09 +0300 |
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committer | Jaakko Keränen <jaakko.keranen@iki.fi> | 2020-09-12 09:48:09 +0300 |
commit | cea85db580d81dd8400663f728d2e37f155abf09 (patch) | |
tree | dd287bd087e10c8b8ca114c0d11538a9f2489b40 /src/ui/visbuf.c | |
parent | fdd3d54c520269a630447576a289261bdca48f37 (diff) |
Separated VisBuf from ListWidget
This will be used in DocumentWidget as well.
Diffstat (limited to 'src/ui/visbuf.c')
-rw-r--r-- | src/ui/visbuf.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/ui/visbuf.c b/src/ui/visbuf.c new file mode 100644 index 00000000..82346ff0 --- /dev/null +++ b/src/ui/visbuf.c | |||
@@ -0,0 +1,116 @@ | |||
1 | #include "visbuf.h" | ||
2 | #include "window.h" | ||
3 | #include "util.h" | ||
4 | |||
5 | iDefineTypeConstruction(VisBuf) | ||
6 | |||
7 | void init_VisBuf(iVisBuf *d) { | ||
8 | d->texSize = zero_I2(); | ||
9 | iZap(d->buffers); | ||
10 | } | ||
11 | |||
12 | void deinit_VisBuf(iVisBuf *d) { | ||
13 | dealloc_VisBuf(d); | ||
14 | } | ||
15 | |||
16 | void invalidate_VisBuf(iVisBuf *d) { | ||
17 | iForIndices(i, d->buffers) { | ||
18 | iZap(d->buffers[i].validRange); | ||
19 | } | ||
20 | } | ||
21 | |||
22 | void alloc_VisBuf(iVisBuf *d, const iInt2 size, int granularity) { | ||
23 | const iInt2 texSize = init_I2(size.x, (size.y / 2 / granularity + 1) * granularity); | ||
24 | if (!d->buffers[0].texture || !isEqual_I2(texSize, d->texSize)) { | ||
25 | d->texSize = texSize; | ||
26 | iForIndices(i, d->buffers) { | ||
27 | iVisBufTexture *tex = &d->buffers[i]; | ||
28 | if (tex->texture) { | ||
29 | SDL_DestroyTexture(tex->texture); | ||
30 | } | ||
31 | tex->texture = | ||
32 | SDL_CreateTexture(renderer_Window(get_Window()), | ||
33 | SDL_PIXELFORMAT_RGBA8888, | ||
34 | SDL_TEXTUREACCESS_STATIC | SDL_TEXTUREACCESS_TARGET, | ||
35 | texSize.x, | ||
36 | texSize.y); | ||
37 | SDL_SetTextureBlendMode(tex->texture, SDL_BLENDMODE_NONE); | ||
38 | tex->origin = i * texSize.y; | ||
39 | iZap(tex->validRange); | ||
40 | } | ||
41 | } | ||
42 | } | ||
43 | |||
44 | void dealloc_VisBuf(iVisBuf *d) { | ||
45 | d->texSize = zero_I2(); | ||
46 | iForIndices(i, d->buffers) { | ||
47 | SDL_DestroyTexture(d->buffers[i].texture); | ||
48 | d->buffers[i].texture = NULL; | ||
49 | } | ||
50 | } | ||
51 | |||
52 | void reposition_VisBuf(iVisBuf *d, const iRangei vis) { | ||
53 | d->vis = vis; | ||
54 | iRangei good = { 0, 0 }; | ||
55 | size_t avail[3], numAvail = 0; | ||
56 | /* Check which buffers are available for reuse. */ { | ||
57 | iForIndices(i, d->buffers) { | ||
58 | iVisBufTexture *buf = d->buffers + i; | ||
59 | const iRangei region = { buf->origin, buf->origin + d->texSize.y }; | ||
60 | if (region.start >= vis.end || region.end <= vis.start) { | ||
61 | avail[numAvail++] = i; | ||
62 | iZap(buf->validRange); | ||
63 | } | ||
64 | else { | ||
65 | good = union_Rangei(good, region); | ||
66 | } | ||
67 | } | ||
68 | } | ||
69 | if (numAvail == iElemCount(d->buffers)) { | ||
70 | /* All buffers are outside the visible range, do a reset. */ | ||
71 | d->buffers[0].origin = vis.start; | ||
72 | d->buffers[1].origin = vis.start + d->texSize.y; | ||
73 | d->buffers[2].origin = vis.start + 2 * d->texSize.y; | ||
74 | } | ||
75 | else { | ||
76 | /* Extend to cover the visible range. */ | ||
77 | while (vis.start < good.start) { | ||
78 | iAssert(numAvail > 0); | ||
79 | d->buffers[avail[--numAvail]].origin = good.start - d->texSize.y; | ||
80 | good.start -= d->texSize.y; | ||
81 | } | ||
82 | while (vis.end > good.end) { | ||
83 | iAssert(numAvail > 0); | ||
84 | d->buffers[avail[--numAvail]].origin = good.end; | ||
85 | good.end += d->texSize.y; | ||
86 | } | ||
87 | } | ||
88 | } | ||
89 | |||
90 | void invalidRanges_VisBuf(const iVisBuf *d, const iRangei full, iRangei *out_invalidRanges) { | ||
91 | iForIndices(i, d->buffers) { | ||
92 | const iVisBufTexture *buf = d->buffers + i; | ||
93 | const iRangei before = { full.start, buf->validRange.start }; | ||
94 | const iRangei after = { buf->validRange.end, full.end }; | ||
95 | const iRangei region = intersect_Rangei(d->vis, (iRangei){ buf->origin, | ||
96 | buf->origin + d->texSize.y }); | ||
97 | out_invalidRanges[i] = intersect_Rangei(before, region); | ||
98 | if (isEmpty_Rangei(out_invalidRanges[i])) { | ||
99 | out_invalidRanges[i] = intersect_Rangei(after, region); | ||
100 | } | ||
101 | } | ||
102 | } | ||
103 | |||
104 | void draw_VisBuf(const iVisBuf *d, iInt2 topLeft) { | ||
105 | SDL_Renderer *render = renderer_Window(get_Window()); | ||
106 | iForIndices(i, d->buffers) { | ||
107 | const iVisBufTexture *buf = d->buffers + i; | ||
108 | SDL_RenderCopy(render, | ||
109 | buf->texture, | ||
110 | NULL, | ||
111 | &(SDL_Rect){ topLeft.x, | ||
112 | topLeft.y + buf->origin, | ||
113 | d->texSize.x, | ||
114 | d->texSize.y }); | ||
115 | } | ||
116 | } | ||