Bug Summary

File:Bitmap.c
Warning:line 538, column 39
Assigned value is garbage or undefined

Annotated Source Code

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clang -cc1 -triple amd64-unknown-openbsd6.8 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name Bitmap.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mthread-model posix -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -resource-dir /usr/local/lib/clang/10.0.1 -I /usr/X11R6/include -I /usr/local/include -fdebug-compilation-dir /home/ben/Projects/ClassiCube/src -ferror-limit 19 -fmessage-length 0 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -fobjc-runtime=gnustep -fdiagnostics-show-option -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -o /home/ben/Projects/ClassiCube/src/scan/2021-01-09-173753-31878-1 -x c Bitmap.c
1#include "Bitmap.h"
2#include "Platform.h"
3#include "PackedCol.h"
4#include "ExtMath.h"
5#include "Deflate.h"
6#include "Logger.h"
7#include "Stream.h"
8#include "Errors.h"
9#include "Utils.h"
10
11void Bitmap_UNSAFE_CopyBlock(int srcX, int srcY, int dstX, int dstY,
12 struct Bitmap* src, struct Bitmap* dst, int size) {
13 int x, y;
14 for (y = 0; y < size; y++) {
15 BitmapCol* srcRow = Bitmap_GetRow(src, srcY + y)((src)->scan0 + (srcY + y) * (src)->width) + srcX;
16 BitmapCol* dstRow = Bitmap_GetRow(dst, dstY + y)((dst)->scan0 + (dstY + y) * (dst)->width) + dstX;
17 for (x = 0; x < size; x++) { dstRow[x] = srcRow[x]; }
18 }
19}
20
21void Bitmap_Allocate(struct Bitmap* bmp, int width, int height) {
22 bmp->width = width; bmp->height = height;
23 bmp->scan0 = (BitmapCol*)Mem_Alloc(width * height, 4, "bitmap data");
24}
25
26void Bitmap_TryAllocate(struct Bitmap* bmp, int width, int height) {
27 bmp->width = width; bmp->height = height;
28 bmp->scan0 = (BitmapCol*)Mem_TryAlloc(width * height, 4);
29}
30
31void Bitmap_AllocateClearedPow2(struct Bitmap* bmp, int width, int height) {
32 width = Math_NextPowOf2(width);
33 height = Math_NextPowOf2(height);
34
35 bmp->width = width; bmp->height = height;
36 bmp->scan0 = (BitmapCol*)Mem_AllocCleared(width * height, 4, "bitmap data");
37}
38
39void Bitmap_TryAllocateClearedPow2(struct Bitmap* bmp, int width, int height) {
40 width = Math_NextPowOf2(width);
41 height = Math_NextPowOf2(height);
42
43 bmp->width = width; bmp->height = height;
44 bmp->scan0 = (BitmapCol*)Mem_TryAllocCleared(width * height, 4);
45}
46
47void Bitmap_Scale(struct Bitmap* dst, struct Bitmap* src,
48 int srcX, int srcY, int srcWidth, int srcHeight) {
49 BitmapCol* dstRow;
50 BitmapCol* srcRow;
51 int x, y, width, height;
52
53 width = dst->width;
54 height = dst->height;
55
56 for (y = 0; y < height; y++) {
57 srcRow = Bitmap_GetRow(src, srcY + (y * srcHeight / height))((src)->scan0 + (srcY + (y * srcHeight / height)) * (src)->
width);
58 dstRow = Bitmap_GetRow(dst, y)((dst)->scan0 + (y) * (dst)->width);
59
60 for (x = 0; x < width; x++) {
61 dstRow[x] = srcRow[srcX + (x * srcWidth / width)];
62 }
63 }
64}
65
66
67/*########################################################################################################################*
68*------------------------------------------------------PNG decoder--------------------------------------------------------*
69*#########################################################################################################################*/
70#define PNG_SIG_SIZE8 8
71#define PNG_IHDR_SIZE13 13
72#define PNG_PALETTE256 256
73#define PNG_FourCC(a, b, c, d)(((cc_uint32)a << 24) | ((cc_uint32)b << 16) | ((
cc_uint32)c << 8) | (cc_uint32)d) (((cc_uint32)a << 24) | ((cc_uint32)b << 16) | ((cc_uint32)c << 8) | (cc_uint32)d)
74
75enum PngCol {
76 PNG_COL_GRAYSCALE = 0, PNG_COL_RGB = 2, PNG_COL_INDEXED = 3,
77 PNG_COL_GRAYSCALE_A = 4, PNG_COL_RGB_A = 6
78};
79
80enum PngFilter {
81 PNG_FILTER_NONE, PNG_FILTER_SUB, PNG_FILTER_UP, PNG_FILTER_AVERAGE, PNG_FILTER_PAETH
82};
83
84typedef void (*Png_RowExpander)(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst);
85static const cc_uint8 pngSig[PNG_SIG_SIZE8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
86
87cc_bool Png_Detect(const cc_uint8* data, cc_uint32 len) {
88 return len >= PNG_SIG_SIZE8 && Mem_Equal(data, pngSig, PNG_SIG_SIZE8);
89}
90
91static void Png_Reconstruct(cc_uint8 type, cc_uint8 bytesPerPixel, cc_uint8* line, cc_uint8* prior, cc_uint32 lineLen) {
92 cc_uint32 i, j;
93 switch (type) {
94 case PNG_FILTER_NONE:
95 return;
96
97 case PNG_FILTER_SUB:
98 for (i = bytesPerPixel, j = 0; i < lineLen; i++, j++) {
99 line[i] += line[j];
100 }
101 return;
102
103 case PNG_FILTER_UP:
104 for (i = 0; i < lineLen; i++) {
105 line[i] += prior[i];
106 }
107 return;
108
109 case PNG_FILTER_AVERAGE:
110 for (i = 0; i < bytesPerPixel; i++) {
111 line[i] += (prior[i] >> 1);
112 }
113 for (j = 0; i < lineLen; i++, j++) {
114 line[i] += ((prior[i] + line[j]) >> 1);
115 }
116 return;
117
118 case PNG_FILTER_PAETH:
119 /* TODO: verify this is right */
120 for (i = 0; i < bytesPerPixel; i++) {
121 line[i] += prior[i];
122 }
123 for (j = 0; i < lineLen; i++, j++) {
124 cc_uint8 a = line[j], b = prior[i], c = prior[j];
125 int p = a + b - c;
126 int pa = Math_AbsI(p - a);
127 int pb = Math_AbsI(p - b);
128 int pc = Math_AbsI(p - c);
129
130 if (pa <= pb && pa <= pc) { line[i] += a; }
131 else if (pb <= pc) { line[i] += b; }
132 else { line[i] += c; }
133 }
134 return;
135 }
136}
137
138#define Bitmap_Set(dst, r,g,b,a)dst = (((cc_uint8)(r) << 16) | ((cc_uint8)(g) << 8
) | ((cc_uint8)(b) << 0) | ((cc_uint8)(a) << 24))
; dst = BitmapCol_Make(r, g, b, a)(((cc_uint8)(r) << 16) | ((cc_uint8)(g) << 8) | (
(cc_uint8)(b) << 0) | ((cc_uint8)(a) << 24));
139
140#define PNG_Do_Grayscale(dstI, src, scale)rgb = (src) * scale; dst[dstI] = (((cc_uint8)(rgb) << 16
) | ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0
) | ((cc_uint8)(255) << 24));; rgb = (src) * scale; Bitmap_Set(dst[dstI], rgb, rgb, rgb, 255)dst[dstI] = (((cc_uint8)(rgb) << 16) | ((cc_uint8)(rgb)
<< 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8)(255
) << 24));;
141#define PNG_Do_Grayscale_8(dstI, srcI)rgb = src[srcI]; dst[dstI] = (((cc_uint8)(rgb) << 16) |
((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0) |
((cc_uint8)(255) << 24));; rgb = src[srcI]; Bitmap_Set(dst[dstI], rgb, rgb, rgb, 255)dst[dstI] = (((cc_uint8)(rgb) << 16) | ((cc_uint8)(rgb)
<< 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8)(255
) << 24));;
142#define PNG_Do_Grayscale_A__8(dstI, srcI)rgb = src[srcI]; dst[dstI] = (((cc_uint8)(rgb) << 16) |
((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0) |
((cc_uint8)(src[srcI + 1]) << 24));; rgb = src[srcI]; Bitmap_Set(dst[dstI], rgb, rgb, rgb, src[srcI + 1])dst[dstI] = (((cc_uint8)(rgb) << 16) | ((cc_uint8)(rgb)
<< 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8)(src
[srcI + 1]) << 24));;
143#define PNG_Do_RGB__8(dstI, srcI)dst[dstI] = (((cc_uint8)(src[srcI]) << 16) | ((cc_uint8
)(src[srcI + 1]) << 8) | ((cc_uint8)(src[srcI + 2]) <<
0) | ((cc_uint8)(255) << 24));; Bitmap_Set(dst[dstI], src[srcI], src[srcI + 1], src[srcI + 2], 255)dst[dstI] = (((cc_uint8)(src[srcI]) << 16) | ((cc_uint8
)(src[srcI + 1]) << 8) | ((cc_uint8)(src[srcI + 2]) <<
0) | ((cc_uint8)(255) << 24));;
144#define PNG_Do_RGB_A__8(dstI, srcI)dst[dstI] = (((cc_uint8)(src[srcI]) << 16) | ((cc_uint8
)(src[srcI + 1]) << 8) | ((cc_uint8)(src[srcI + 2]) <<
0) | ((cc_uint8)(src[srcI + 3]) << 24));; Bitmap_Set(dst[dstI], src[srcI], src[srcI + 1], src[srcI + 2], src[srcI + 3])dst[dstI] = (((cc_uint8)(src[srcI]) << 16) | ((cc_uint8
)(src[srcI + 1]) << 8) | ((cc_uint8)(src[srcI + 2]) <<
0) | ((cc_uint8)(src[srcI + 3]) << 24));;
145
146#define PNG_Mask_1(i)(7 - (i & 7)) (7 - (i & 7))
147#define PNG_Mask_2(i)((3 - (i & 3)) * 2) ((3 - (i & 3)) * 2)
148#define PNG_Mask_4(i)((1 - (i & 1)) * 4) ((1 - (i & 1)) * 4)
149#define PNG_Get__1(i)((src[i >> 3] >> (7 - (i & 7))) & 1) ((src[i >> 3] >> PNG_Mask_1(i)(7 - (i & 7))) & 1)
150#define PNG_Get__2(i)((src[i >> 2] >> ((3 - (i & 3)) * 2)) & 3
) ((src[i >> 2] >> PNG_Mask_2(i)((3 - (i & 3)) * 2)) & 3)
151
152static void Png_Expand_GRAYSCALE_1(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
153 int i; cc_uint8 rgb; /* NOTE: not optimised*/
154 for (i = 0; i < width; i++) { PNG_Do_Grayscale(i, PNG_Get__1(i), 255)rgb = (((src[i >> 3] >> (7 - (i & 7))) & 1
)) * 255; dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8
)(rgb) << 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8
)(255) << 24));;; }
155}
156
157static void Png_Expand_GRAYSCALE_2(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
158 int i; cc_uint8 rgb; /* NOTE: not optimised */
159 for (i = 0; i < width; i++) { PNG_Do_Grayscale(i, PNG_Get__2(i), 85)rgb = (((src[i >> 2] >> ((3 - (i & 3)) * 2)) &
3)) * 85; dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8
)(rgb) << 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8
)(255) << 24));;; }
160}
161
162static void Png_Expand_GRAYSCALE_4(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
163 int i, j; cc_uint8 rgb;
164
165 for (i = 0, j = 0; i < (width & ~0x1); i += 2, j++) {
166 PNG_Do_Grayscale(i, src[j] >> 4, 17)rgb = (src[j] >> 4) * 17; dst[i] = (((cc_uint8)(rgb) <<
16) | ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) <<
0) | ((cc_uint8)(255) << 24));;; PNG_Do_Grayscale(i + 1, src[j] & 0x0F, 17)rgb = (src[j] & 0x0F) * 17; dst[i + 1] = (((cc_uint8)(rgb
) << 16) | ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb
) << 0) | ((cc_uint8)(255) << 24));;;
167 }
168 for (; i < width; i++) {
169 PNG_Do_Grayscale(i, (src[j] >> PNG_Mask_4(i)) & 15, 17)rgb = ((src[j] >> ((1 - (i & 1)) * 4)) & 15) * 17
; dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8)(rgb) <<
8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8)(255) <<
24));;;
170 }
171}
172
173static void Png_Expand_GRAYSCALE_8(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
174 int i; cc_uint8 rgb;
175
176 for (i = 0; i < (width & ~0x3); i += 4) {
177 PNG_Do_Grayscale_8(i , i )rgb = src[i]; dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8
)(rgb) << 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8
)(255) << 24));;; PNG_Do_Grayscale_8(i + 1, i + 1)rgb = src[i + 1]; dst[i + 1] = (((cc_uint8)(rgb) << 16)
| ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0
) | ((cc_uint8)(255) << 24));;;
178 PNG_Do_Grayscale_8(i + 2, i + 2)rgb = src[i + 2]; dst[i + 2] = (((cc_uint8)(rgb) << 16)
| ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0
) | ((cc_uint8)(255) << 24));;; PNG_Do_Grayscale_8(i + 3, i + 3)rgb = src[i + 3]; dst[i + 3] = (((cc_uint8)(rgb) << 16)
| ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0
) | ((cc_uint8)(255) << 24));;;
179 }
180 for (; i < width; i++) { PNG_Do_Grayscale_8(i, i)rgb = src[i]; dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8
)(rgb) << 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8
)(255) << 24));;; }
181}
182
183static void Png_Expand_GRAYSCALE_16(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
184 int i; cc_uint8 rgb; /* NOTE: not optimised */
185 for (i = 0; i < width; i++) {
186 rgb = src[i * 2]; Bitmap_Set(dst[i], rgb, rgb, rgb, 255)dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8)(rgb) <<
8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8)(255) <<
24));;
187 }
188}
189
190static void Png_Expand_RGB_8(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
191 int i, j;
192
193 for (i = 0, j = 0; i < (width & ~0x03); i += 4, j += 12) {
194 PNG_Do_RGB__8(i , j )dst[i] = (((cc_uint8)(src[j]) << 16) | ((cc_uint8)(src[
j + 1]) << 8) | ((cc_uint8)(src[j + 2]) << 0) | (
(cc_uint8)(255) << 24));;; PNG_Do_RGB__8(i + 1, j + 3)dst[i + 1] = (((cc_uint8)(src[j + 3]) << 16) | ((cc_uint8
)(src[j + 3 + 1]) << 8) | ((cc_uint8)(src[j + 3 + 2]) <<
0) | ((cc_uint8)(255) << 24));;;
195 PNG_Do_RGB__8(i + 2, j + 6)dst[i + 2] = (((cc_uint8)(src[j + 6]) << 16) | ((cc_uint8
)(src[j + 6 + 1]) << 8) | ((cc_uint8)(src[j + 6 + 2]) <<
0) | ((cc_uint8)(255) << 24));;; PNG_Do_RGB__8(i + 3, j + 9)dst[i + 3] = (((cc_uint8)(src[j + 9]) << 16) | ((cc_uint8
)(src[j + 9 + 1]) << 8) | ((cc_uint8)(src[j + 9 + 2]) <<
0) | ((cc_uint8)(255) << 24));;;
196 }
197 for (; i < width; i++, j += 3) { PNG_Do_RGB__8(i, j)dst[i] = (((cc_uint8)(src[j]) << 16) | ((cc_uint8)(src[
j + 1]) << 8) | ((cc_uint8)(src[j + 2]) << 0) | (
(cc_uint8)(255) << 24));;; }
198}
199
200static void Png_Expand_RGB_16(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
201 int i, j; /* NOTE: not optimised */
202 for (i = 0, j = 0; i < width; i++, j += 6) {
203 Bitmap_Set(dst[i], src[j], src[j + 2], src[j + 4], 255)dst[i] = (((cc_uint8)(src[j]) << 16) | ((cc_uint8)(src[
j + 2]) << 8) | ((cc_uint8)(src[j + 4]) << 0) | (
(cc_uint8)(255) << 24));;
204 }
205}
206
207static void Png_Expand_INDEXED_1(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
208 int i; /* NOTE: not optimised */
209 for (i = 0; i < width; i++) { dst[i] = palette[PNG_Get__1(i)((src[i >> 3] >> (7 - (i & 7))) & 1)]; }
210}
211
212static void Png_Expand_INDEXED_2(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
213 int i; /* NOTE: not optimised */
214 for (i = 0; i < width; i++) { dst[i] = palette[PNG_Get__2(i)((src[i >> 2] >> ((3 - (i & 3)) * 2)) & 3
)]; }
215}
216
217static void Png_Expand_INDEXED_4(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
218 int i, j; cc_uint8 cur;
219
220 for (i = 0, j = 0; i < (width & ~0x1); i += 2, j++) {
221 cur = src[j];
222 dst[i] = palette[cur >> 4]; dst[i + 1] = palette[cur & 0x0F];
223 }
224 for (; i < width; i++) {
225 dst[i] = palette[(src[j] >> PNG_Mask_4(i)((1 - (i & 1)) * 4)) & 15];
226 }
227}
228
229static void Png_Expand_INDEXED_8(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
230 int i;
231
232 for (i = 0; i < (width & ~0x3); i += 4) {
233 dst[i] = palette[src[i]]; dst[i + 1] = palette[src[i + 1]];
234 dst[i + 2] = palette[src[i + 2]]; dst[i + 3] = palette[src[i + 3]];
235 }
236 for (; i < width; i++) { dst[i] = palette[src[i]]; }
237}
238
239static void Png_Expand_GRAYSCALE_A_8(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
240 int i, j; cc_uint8 rgb;
241
242 for (i = 0, j = 0; i < (width & ~0x3); i += 4, j += 8) {
243 PNG_Do_Grayscale_A__8(i , j )rgb = src[j]; dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8
)(rgb) << 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8
)(src[j + 1]) << 24));;; PNG_Do_Grayscale_A__8(i + 1, j + 2)rgb = src[j + 2]; dst[i + 1] = (((cc_uint8)(rgb) << 16)
| ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0
) | ((cc_uint8)(src[j + 2 + 1]) << 24));;;
244 PNG_Do_Grayscale_A__8(i + 2, j + 4)rgb = src[j + 4]; dst[i + 2] = (((cc_uint8)(rgb) << 16)
| ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0
) | ((cc_uint8)(src[j + 4 + 1]) << 24));;; PNG_Do_Grayscale_A__8(i + 3, j + 6)rgb = src[j + 6]; dst[i + 3] = (((cc_uint8)(rgb) << 16)
| ((cc_uint8)(rgb) << 8) | ((cc_uint8)(rgb) << 0
) | ((cc_uint8)(src[j + 6 + 1]) << 24));;;
245 }
246 for (; i < width; i++, j += 2) { PNG_Do_Grayscale_A__8(i, j)rgb = src[j]; dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8
)(rgb) << 8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8
)(src[j + 1]) << 24));;; }
247}
248
249static void Png_Expand_GRAYSCALE_A_16(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
250 int i; cc_uint8 rgb; /* NOTE: not optimised*/
251 for (i = 0; i < width; i++) {
252 rgb = src[i * 4]; Bitmap_Set(dst[i], rgb, rgb, rgb, src[i * 4 + 2])dst[i] = (((cc_uint8)(rgb) << 16) | ((cc_uint8)(rgb) <<
8) | ((cc_uint8)(rgb) << 0) | ((cc_uint8)(src[i * 4 + 2
]) << 24));;
253 }
254}
255
256static void Png_Expand_RGB_A_8(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
257 int i, j;
258
259 for (i = 0, j = 0; i < (width & ~0x3); i += 4, j += 16) {
260 PNG_Do_RGB_A__8(i , j )dst[i] = (((cc_uint8)(src[j]) << 16) | ((cc_uint8)(src[
j + 1]) << 8) | ((cc_uint8)(src[j + 2]) << 0) | (
(cc_uint8)(src[j + 3]) << 24));;; PNG_Do_RGB_A__8(i + 1, j + 4 )dst[i + 1] = (((cc_uint8)(src[j + 4]) << 16) | ((cc_uint8
)(src[j + 4 + 1]) << 8) | ((cc_uint8)(src[j + 4 + 2]) <<
0) | ((cc_uint8)(src[j + 4 + 3]) << 24));;;
261 PNG_Do_RGB_A__8(i + 2, j + 8)dst[i + 2] = (((cc_uint8)(src[j + 8]) << 16) | ((cc_uint8
)(src[j + 8 + 1]) << 8) | ((cc_uint8)(src[j + 8 + 2]) <<
0) | ((cc_uint8)(src[j + 8 + 3]) << 24));;; PNG_Do_RGB_A__8(i + 3, j + 12)dst[i + 3] = (((cc_uint8)(src[j + 12]) << 16) | ((cc_uint8
)(src[j + 12 + 1]) << 8) | ((cc_uint8)(src[j + 12 + 2])
<< 0) | ((cc_uint8)(src[j + 12 + 3]) << 24));;;
262 }
263 for (; i < width; i++, j += 4) { PNG_Do_RGB_A__8(i, j)dst[i] = (((cc_uint8)(src[j]) << 16) | ((cc_uint8)(src[
j + 1]) << 8) | ((cc_uint8)(src[j + 2]) << 0) | (
(cc_uint8)(src[j + 3]) << 24));;; }
264}
265
266static void Png_Expand_RGB_A_16(int width, BitmapCol* palette, cc_uint8* src, BitmapCol* dst) {
267 int i, j; /* NOTE: not optimised*/
268 for (i = 0, j = 0; i < width; i++, j += 8) {
269 Bitmap_Set(dst[i], src[j], src[j + 2], src[j + 4], src[j + 6])dst[i] = (((cc_uint8)(src[j]) << 16) | ((cc_uint8)(src[
j + 2]) << 8) | ((cc_uint8)(src[j + 4]) << 0) | (
(cc_uint8)(src[j + 6]) << 24));;
270 }
271}
272
273static Png_RowExpander Png_GetExpander(cc_uint8 col, cc_uint8 bitsPerSample) {
274 switch (col) {
275 case PNG_COL_GRAYSCALE:
276 switch (bitsPerSample) {
277 case 1: return Png_Expand_GRAYSCALE_1;
278 case 2: return Png_Expand_GRAYSCALE_2;
279 case 4: return Png_Expand_GRAYSCALE_4;
280 case 8: return Png_Expand_GRAYSCALE_8;
281 case 16: return Png_Expand_GRAYSCALE_16;
282 }
283 return NULL((void*)0);
284
285 case PNG_COL_RGB:
286 switch (bitsPerSample) {
287 case 8: return Png_Expand_RGB_8;
288 case 16: return Png_Expand_RGB_16;
289 }
290 return NULL((void*)0);
291
292 case PNG_COL_INDEXED:
293 switch (bitsPerSample) {
294 case 1: return Png_Expand_INDEXED_1;
295 case 2: return Png_Expand_INDEXED_2;
296 case 4: return Png_Expand_INDEXED_4;
297 case 8: return Png_Expand_INDEXED_8;
298 }
299 return NULL((void*)0);
300
301 case PNG_COL_GRAYSCALE_A:
302 switch (bitsPerSample) {
303 case 8: return Png_Expand_GRAYSCALE_A_8;
304 case 16: return Png_Expand_GRAYSCALE_A_16;
305 }
306 return NULL((void*)0);
307
308 case PNG_COL_RGB_A:
309 switch (bitsPerSample) {
310 case 8: return Png_Expand_RGB_A_8;
311 case 16: return Png_Expand_RGB_A_16;
312 }
313 return NULL((void*)0);
314 }
315 return NULL((void*)0);
316}
317
318/* Sets alpha to 0 for any pixels in the bitmap whose RGB is same as col */
319static void ComputeTransparency(struct Bitmap* bmp, BitmapCol col) {
320 BitmapCol trnsRGB = col & BITMAPCOL_RGB_MASK((0xFFU << 16) | (0xFFU << 8) | (0xFFU << 0
));
321 int x, y, width = bmp->width, height = bmp->height;
322
323 for (y = 0; y < height; y++) {
324 BitmapCol* row = Bitmap_GetRow(bmp, y)((bmp)->scan0 + (y) * (bmp)->width);
325 for (x = 0; x < width; x++) {
326 BitmapCol rgb = row[x] & BITMAPCOL_RGB_MASK((0xFFU << 16) | (0xFFU << 8) | (0xFFU << 0
));
327 row[x] = (rgb == trnsRGB) ? trnsRGB : row[x];
328 }
329 }
330}
331
332/* Most bits per sample is 16. Most samples per pixel is 4. Add 1 for filter byte. */
333/* Need to store both current and prior row, per PNG specification. */
334#define PNG_BUFFER_SIZE((0x8000 * 2 * 4 + 1) * 2) ((PNG_MAX_DIMS0x8000 * 2 * 4 + 1) * 2)
335
336/* TODO: Test a lot of .png files and ensure output is right */
337cc_result Png_Decode(struct Bitmap* bmp, struct Stream* stream) {
338 cc_uint8 tmp[PNG_PALETTE256 * 3];
339 cc_uint32 dataSize, fourCC;
340 cc_result res;
341
342 /* header variables */
343 static cc_uint32 samplesPerPixel[7] = { 1, 0, 3, 1, 2, 0, 4 };
344 cc_uint8 col, bitsPerSample, bytesPerPixel;
345 Png_RowExpander rowExpander;
346 cc_uint32 scanlineSize, scanlineBytes;
347
348 /* palette data */
349 BitmapCol trnsCol;
350 BitmapCol palette[PNG_PALETTE256];
351 cc_uint32 i;
352
353 /* idat state */
354 cc_uint32 curY = 0, begY, rowY, endY;
355 cc_uint8 buffer[PNG_BUFFER_SIZE((0x8000 * 2 * 4 + 1) * 2)];
356 cc_uint32 bufferRows, bufferLen;
357 cc_uint32 bufferIdx, read, left;
358
359 /* idat decompressor */
360 struct InflateState inflate;
361 struct Stream compStream, datStream;
362 struct ZLibHeader zlibHeader;
363
364 bmp->width = 0; bmp->height = 0;
365 bmp->scan0 = NULL((void*)0);
366
367 res = Stream_Read(stream, tmp, PNG_SIG_SIZE8);
368 if (res) return res;
369 if (!Png_Detect(tmp, PNG_SIG_SIZE8)) return PNG_ERR_INVALID_SIG;
370
371 trnsCol = BITMAPCOL_BLACK(((cc_uint8)(0) << 16) | ((cc_uint8)(0) << 8) | (
(cc_uint8)(0) << 0) | ((cc_uint8)(255) << 24));
372 for (i = 0; i < PNG_PALETTE256; i++) { palette[i] = BITMAPCOL_BLACK(((cc_uint8)(0) << 16) | ((cc_uint8)(0) << 8) | (
(cc_uint8)(0) << 0) | ((cc_uint8)(255) << 24)); }
373
374 Inflate_MakeStream2(&compStream, &inflate, stream);
375 ZLibHeader_Init(&zlibHeader);
376
377 for (;;) {
378 res = Stream_Read(stream, tmp, 8);
379 if (res) return res;
380 dataSize = Stream_GetU32_BE(tmp + 0);
381 fourCC = Stream_GetU32_BE(tmp + 4);
382
383 switch (fourCC) {
384 case PNG_FourCC('I','H','D','R')(((cc_uint32)'I' << 24) | ((cc_uint32)'H' << 16) |
((cc_uint32)'D' << 8) | (cc_uint32)'R'): {
385 if (dataSize != PNG_IHDR_SIZE13) return PNG_ERR_INVALID_HDR_SIZE;
386 res = Stream_Read(stream, tmp, PNG_IHDR_SIZE13);
387 if (res) return res;
388
389 bmp->width = (int)Stream_GetU32_BE(tmp + 0);
390 bmp->height = (int)Stream_GetU32_BE(tmp + 4);
391 if (bmp->width < 0 || bmp->width > PNG_MAX_DIMS0x8000) return PNG_ERR_TOO_WIDE;
392 if (bmp->height < 0 || bmp->height > PNG_MAX_DIMS0x8000) return PNG_ERR_TOO_TALL;
393
394 bmp->scan0 = (BitmapCol*)Mem_TryAlloc(bmp->width * bmp->height, 4);
395 if (!bmp->scan0) return ERR_OUT_OF_MEMORY;
396
397 bitsPerSample = tmp[8]; col = tmp[9];
398 rowExpander = Png_GetExpander(col, bitsPerSample);
399 if (rowExpander == NULL((void*)0)) return PNG_ERR_INVALID_COL_BPP;
400
401 if (tmp[10] != 0) return PNG_ERR_COMP_METHOD;
402 if (tmp[11] != 0) return PNG_ERR_FILTER;
403 if (tmp[12] != 0) return PNG_ERR_INTERLACED;
404
405 bytesPerPixel = ((samplesPerPixel[col] * bitsPerSample) + 7) >> 3;
406 scanlineSize = ((samplesPerPixel[col] * bitsPerSample * bmp->width) + 7) >> 3;
407 scanlineBytes = scanlineSize + 1; /* Add 1 byte for filter byte of each scanline */
408
409 Mem_Set(buffer, 0, scanlineBytes); /* Prior row should be 0 per PNG spec */
410 bufferIdx = scanlineBytes;
411 bufferRows = PNG_BUFFER_SIZE((0x8000 * 2 * 4 + 1) * 2) / scanlineBytes;
412 bufferLen = bufferRows * scanlineBytes;
413 } break;
414
415 case PNG_FourCC('P','L','T','E')(((cc_uint32)'P' << 24) | ((cc_uint32)'L' << 16) |
((cc_uint32)'T' << 8) | (cc_uint32)'E'): {
416 if (dataSize > PNG_PALETTE256 * 3) return PNG_ERR_PAL_SIZE;
417 if ((dataSize % 3) != 0) return PNG_ERR_PAL_SIZE;
418 res = Stream_Read(stream, tmp, dataSize);
419 if (res) return res;
420
421 for (i = 0; i < dataSize; i += 3) {
422 palette[i / 3] &= BITMAPCOL_A_MASK(0xFFU << 24); /* set RGB to 0 */
423 palette[i / 3] |= tmp[i ] << BITMAPCOL_R_SHIFT16;
424 palette[i / 3] |= tmp[i + 1] << BITMAPCOL_G_SHIFT8;
425 palette[i / 3] |= tmp[i + 2] << BITMAPCOL_B_SHIFT0;
426 }
427 } break;
428
429 case PNG_FourCC('t','R','N','S')(((cc_uint32)'t' << 24) | ((cc_uint32)'R' << 16) |
((cc_uint32)'N' << 8) | (cc_uint32)'S'): {
430 if (col == PNG_COL_GRAYSCALE) {
431 if (dataSize != 2) return PNG_ERR_TRANS_COUNT;
432 res = Stream_Read(stream, tmp, dataSize);
433 if (res) return res;
434
435 /* RGB is 16 bits big endian, ignore least significant 8 bits */
436 trnsCol = BitmapCol_Make(tmp[0], tmp[0], tmp[0], 0)(((cc_uint8)(tmp[0]) << 16) | ((cc_uint8)(tmp[0]) <<
8) | ((cc_uint8)(tmp[0]) << 0) | ((cc_uint8)(0) <<
24));
437 } else if (col == PNG_COL_INDEXED) {
438 if (dataSize > PNG_PALETTE256) return PNG_ERR_TRANS_COUNT;
439 res = Stream_Read(stream, tmp, dataSize);
440 if (res) return res;
441
442 /* set alpha component of palette */
443 for (i = 0; i < dataSize; i++) {
444 palette[i] &= BITMAPCOL_RGB_MASK((0xFFU << 16) | (0xFFU << 8) | (0xFFU << 0
)); /* set A to 0 */
445 palette[i] |= tmp[i] << PACKEDCOL_A_SHIFT24;
446 }
447 } else if (col == PNG_COL_RGB) {
448 if (dataSize != 6) return PNG_ERR_TRANS_COUNT;
449 res = Stream_Read(stream, tmp, dataSize);
450 if (res) return res;
451
452 /* R,G,B is 16 bits big endian, ignore least significant 8 bits */
453 trnsCol = BitmapCol_Make(tmp[0], tmp[2], tmp[4], 0)(((cc_uint8)(tmp[0]) << 16) | ((cc_uint8)(tmp[2]) <<
8) | ((cc_uint8)(tmp[4]) << 0) | ((cc_uint8)(0) <<
24));
454 } else {
455 return PNG_ERR_TRANS_INVALID;
456 }
457 } break;
458
459 case PNG_FourCC('I','D','A','T')(((cc_uint32)'I' << 24) | ((cc_uint32)'D' << 16) |
((cc_uint32)'A' << 8) | (cc_uint32)'T'): {
460 Stream_ReadonlyPortion(&datStream, stream, dataSize);
461 inflate.Source = &datStream;
462
463 /* TODO: This assumes zlib header will be in 1 IDAT chunk */
464 while (!zlibHeader.done) {
465 if ((res = ZLibHeader_Read(&datStream, &zlibHeader))) return res;
466 }
467 if (!bmp->scan0) return PNG_ERR_NO_DATA;
468
469 while (curY < bmp->height) {
470 /* Need to leave one row in buffer untouched for storing prior scanline. Illustrated example of process:
471 * |=====| #-----| |-----| #-----| |-----|
472 * initial #-----| read 3 |-----| read 3 |-----| read 1 |-----| read 3 |-----| etc
473 * state |-----| -----> |-----| -----> |=====| -----> |-----| -----> |=====|
474 * |-----| |=====| #-----| |=====| #-----|
475 *
476 * (==== is prior scanline, # is current index in buffer)
477 * Having initial state this way allows doing two 'read 3' first time (assuming large idat chunks)
478 */
479
480 begY = bufferIdx / scanlineBytes;
481 left = bufferLen - bufferIdx;
482 /* if row is at 0, last row in buffer is prior row */
483 /* hence subtract a row, as don't want to overwrite it */
484 if (begY == 0) left -= scanlineBytes;
485
486 res = compStream.Read(&compStream, &buffer[bufferIdx], left, &read);
487 if (res) return res;
488 if (!read) break;
489
490 bufferIdx += read;
491 endY = bufferIdx / scanlineBytes;
492 /* reached end of buffer, cycle back to start */
493 if (bufferIdx == bufferLen) bufferIdx = 0;
494
495 /* NOTE: Need to check curY too, in case IDAT is corrupted and has extra data */
496 for (rowY = begY; rowY < endY && curY < bmp->height; rowY++, curY++) {
497 cc_uint32 priorY = rowY == 0 ? bufferRows : rowY;
498 cc_uint8* prior = &buffer[(priorY - 1) * scanlineBytes];
499 cc_uint8* scanline = &buffer[rowY * scanlineBytes];
500
501 if (scanline[0] > PNG_FILTER_PAETH) return PNG_ERR_INVALID_SCANLINE;
502 Png_Reconstruct(scanline[0], bytesPerPixel, &scanline[1], &prior[1], scanlineSize);
503 rowExpander(bmp->width, palette, &scanline[1], Bitmap_GetRow(bmp, curY)((bmp)->scan0 + (curY) * (bmp)->width));
504 }
505 }
506
507 if (curY == bmp->height) {
508 if (!BitmapCol_A(trnsCol)((cc_uint8)(trnsCol >> 24))) ComputeTransparency(bmp, trnsCol);
509 return 0;
510 }
511 } break;
512
513 case PNG_FourCC('I','E','N','D')(((cc_uint32)'I' << 24) | ((cc_uint32)'E' << 16) |
((cc_uint32)'N' << 8) | (cc_uint32)'D'):
514 /* Reading all image data should be handled by above if in the IDAT chunk */
515 /* If we reached here, it means not all of the image data was read */
516 return PNG_ERR_REACHED_IEND;
517
518 default:
519 if ((res = stream->Skip(stream, dataSize))) return res;
520 break;
521 }
522
523 if ((res = stream->Skip(stream, 4))) return res; /* Skip CRC32 */
524 }
525}
526
527
528/*########################################################################################################################*
529*------------------------------------------------------PNG encoder--------------------------------------------------------*
530*#########################################################################################################################*/
531static void Png_Filter(cc_uint8 filter, const cc_uint8* cur, const cc_uint8* prior, cc_uint8* best, int lineLen, int bpp) {
532 /* 3 bytes per pixel constant */
533 cc_uint8 a, b, c;
534 int i, p, pa, pb, pc;
535
536 switch (filter) {
27
←
Control jumps to 'case PNG_FILTER_SUB:' at line 537
→
537 case PNG_FILTER_SUB:
538 for (i = 0; i < bpp; i++) { best[i] = cur[i]; }
28
←
The value 0 is assigned to 'i'
→
29
←
Loop condition is true. Entering loop body
→
30
←
Assigned value is garbage or undefined
539
540 for (; i < lineLen; i++) {
541 best[i] = cur[i] - cur[i - bpp];
542 }
543 break;
544
545 case PNG_FILTER_UP:
546 for (i = 0; i < lineLen; i++) {
547 best[i] = cur[i] - prior[i];
548 }
549 break;
550
551 case PNG_FILTER_AVERAGE:
552 for (i = 0; i < bpp; i++) { best[i] = cur[i] - (prior[i] >> 1); }
553
554 for (; i < lineLen; i++) {
555 best[i] = cur[i] - ((prior[i] + cur[i - bpp]) >> 1);
556 }
557 break;
558
559 case PNG_FILTER_PAETH:
560 for (i = 0; i < bpp; i++) { best[i] = cur[i] - prior[i]; }
561
562 for (; i < lineLen; i++) {
563 a = cur[i - bpp]; b = prior[i]; c = prior[i - bpp];
564 p = a + b - c;
565
566 pa = Math_AbsI(p - a);
567 pb = Math_AbsI(p - b);
568 pc = Math_AbsI(p - c);
569
570 if (pa <= pb && pa <= pc) { best[i] = cur[i] - a; }
571 else if (pb <= pc) { best[i] = cur[i] - b; }
572 else { best[i] = cur[i] - c; }
573 }
574 break;
575 }
576}
577
578static void Png_MakeRow(const BitmapCol* src, cc_uint8* dst, int lineLen, cc_bool alpha) {
579 cc_uint8* end = dst + lineLen;
580 BitmapCol col; /* if we use *src, register gets reloaded each time */
581
582 if (alpha
18.1
'alpha' is 0
) {
19
←
Taking false branch
→
583 for (; dst < end; src++, dst += 4) {
584 col = *src;
585 dst[0] = BitmapCol_R(col)((cc_uint8)(col >> 16)); dst[1] = BitmapCol_G(col)((cc_uint8)(col >> 8));
586 dst[2] = BitmapCol_B(col)((cc_uint8)(col >> 0)); dst[3] = BitmapCol_A(col)((cc_uint8)(col >> 24));
587 }
588 } else {
589 for (; dst < end; src++, dst += 3) {
20
←
Assuming 'dst' is >= 'end'
→
21
←
Loop condition is false. Execution continues on line 589
→
590 col = *src;
591 dst[0] = BitmapCol_R(col)((cc_uint8)(col >> 16)); dst[1] = BitmapCol_G(col)((cc_uint8)(col >> 8));
592 dst[2] = BitmapCol_B(col)((cc_uint8)(col >> 0));
593 }
594 }
595}
596
597static void Png_EncodeRow(const cc_uint8* cur, const cc_uint8* prior, cc_uint8* best, int lineLen, cc_bool alpha) {
598 cc_uint8* dst;
599 int bestFilter, bestEstimate = Int32_MaxValue((cc_int32)2147483647L);
600 int x, filter, estimate;
601
602 dst = best + 1;
603 /* NOTE: Waste of time trying the PNG_NONE filter */
604 for (filter = PNG_FILTER_SUB; filter <= PNG_FILTER_PAETH; filter++) {
24
←
Loop condition is true. Entering loop body
→
605 Png_Filter(filter, cur, prior, dst, lineLen, alpha
24.1
'alpha' is 0
 ? 4 : 3);
25
←
'?' condition is false
→
26
←
Calling 'Png_Filter'
→
606
607 /* Estimate how well this filtered line will compress, based on */
608 /* smallest sum of magnitude of each byte (signed) in the line */
609 /* (see note in PNG specification, 12.8 "Filter selection" ) */
610 estimate = 0;
611 for (x = 0; x < lineLen; x++) {
612 estimate += Math_AbsI((cc_int8)dst[x]);
613 }
614
615 if (estimate > bestEstimate) continue;
616 bestEstimate = estimate;
617 bestFilter = filter;
618 }
619
620 /* The bytes in dst are from last filter run (paeth) */
621 /* However, we want dst to be bytes from the best filter */
622 if (bestFilter != PNG_FILTER_PAETH) {
623 Png_Filter(bestFilter, cur, prior, dst, lineLen, alpha ? 4 : 3);
624 }
625
626 best[0] = bestFilter;
627}
628
629static int Png_SelectRow(struct Bitmap* bmp, int y) { return y; }
630cc_result Png_Encode(struct Bitmap* bmp, struct Stream* stream,
631 Png_RowSelector selectRow, cc_bool alpha) {
632 cc_uint8 tmp[32];
633 /* TODO: This should be * 4 for alpha (should switch to mem_alloc though) */
634 cc_uint8 prevLine[PNG_MAX_DIMS0x8000 * 3], curLine[PNG_MAX_DIMS0x8000 * 3];
635 cc_uint8 bestLine[PNG_MAX_DIMS0x8000 * 3 + 1];
636
637 struct ZLibState zlState;
638 struct Stream chunk, zlStream;
639 cc_uint32 stream_end, stream_beg;
640 int y, lineSize;
641 cc_result res;
642
643 /* stream may not start at 0 (e.g. when making default.zip) */
644 if ((res = stream->Position(stream, &stream_beg))) return res;
1
Assuming 'res' is 0
→
2
←
Taking false branch
→
645
646 if (!selectRow) selectRow = Png_SelectRow;
3
←
Assuming 'selectRow' is non-null
→
4
←
Taking false branch
→
647 if ((res = Stream_Write(stream, pngSig, PNG_SIG_SIZE8))) return res;
5
←
Assuming 'res' is 0
→
6
←
Taking false branch
→
648 Stream_WriteonlyCrc32(&chunk, stream);
649
650 /* Write header chunk */
651 Stream_SetU32_BE(&tmp[0], PNG_IHDR_SIZE13);
652 Stream_SetU32_BE(&tmp[4], PNG_FourCC('I','H','D','R')(((cc_uint32)'I' << 24) | ((cc_uint32)'H' << 16) |
((cc_uint32)'D' << 8) | (cc_uint32)'R'));
653 {
654 Stream_SetU32_BE(&tmp[8], bmp->width);
655 Stream_SetU32_BE(&tmp[12], bmp->height);
656 tmp[16] = 8; /* bits per sample */
657 tmp[17] = alpha ? PNG_COL_RGB_A : PNG_COL_RGB;
7
←
Assuming 'alpha' is 0
→
8
←
'?' condition is false
→
658 tmp[18] = 0; /* DEFLATE compression method */
659 tmp[19] = 0; /* ADAPTIVE filter method */
660 tmp[20] = 0; /* Not using interlacing */
661 }
662 Stream_SetU32_BE(&tmp[21], Utils_CRC32(&tmp[4], 17));
663
664 /* Write PNG body */
665 Stream_SetU32_BE(&tmp[25], 0); /* size of IDAT, filled in later */
666 if ((res = Stream_Write(stream, tmp, 29))) return res;
9
←
Assuming 'res' is 0
→
10
←
Taking false branch
→
667 Stream_SetU32_BE(&tmp[0], PNG_FourCC('I','D','A','T')(((cc_uint32)'I' << 24) | ((cc_uint32)'D' << 16) |
((cc_uint32)'A' << 8) | (cc_uint32)'T'));
668 if ((res = Stream_Write(&chunk, tmp, 4))) return res;
11
←
Assuming 'res' is 0
→
12
←
Taking false branch
→
669
670 ZLib_MakeStream(&zlStream, &zlState, &chunk);
671 lineSize = bmp->width * (alpha
12.1
'alpha' is 0
 ? 4 : 3);
13
←
'?' condition is false
→
672 Mem_Set(prevLine, 0, lineSize);
673
674 for (y = 0; y < bmp->height; y++) {
14
←
Assuming 'y' is < field 'height'
→
15
←
Loop condition is true. Entering loop body
→
675 int row = selectRow(bmp, y);
676 BitmapCol* src = Bitmap_GetRow(bmp, row)((bmp)->scan0 + (row) * (bmp)->width);
677 cc_uint8* prev = (y & 1) == 0 ? prevLine : curLine;
16
←
'?' condition is true
→
678 cc_uint8* cur = (y & 1) == 0 ? curLine : prevLine;
17
←
'?' condition is true
→
679
680 Png_MakeRow(src, cur, lineSize, alpha);
18
←
Calling 'Png_MakeRow'
→
22
←
Returning from 'Png_MakeRow'
→
681 Png_EncodeRow(cur, prev, bestLine, lineSize, alpha);
23
←
Calling 'Png_EncodeRow'
→
682
683 /* +1 for filter byte */
684 if ((res = Stream_Write(&zlStream, bestLine, lineSize + 1))) return res;
685 }
686 if ((res = zlStream.Close(&zlStream))) return res;
687 Stream_SetU32_BE(&tmp[0], chunk.Meta.CRC32.CRC32 ^ 0xFFFFFFFFUL);
688
689 /* Write end chunk */
690 Stream_SetU32_BE(&tmp[4], 0);
691 Stream_SetU32_BE(&tmp[8], PNG_FourCC('I','E','N','D')(((cc_uint32)'I' << 24) | ((cc_uint32)'E' << 16) |
((cc_uint32)'N' << 8) | (cc_uint32)'D'));
692 Stream_SetU32_BE(&tmp[12], 0xAE426082UL); /* CRC32 of IEND */
693 if ((res = Stream_Write(stream, tmp, 16))) return res;
694
695 /* Come back to fixup size of data in data chunk */
696 if ((res = stream->Length(stream, &stream_end))) return res;
697 if ((res = stream->Seek(stream, stream_beg + 33))) return res;
698
699 Stream_SetU32_BE(&tmp[0], (stream_end - stream_beg) - 57);
700 if ((res = Stream_Write(stream, tmp, 4))) return res;
701 return stream->Seek(stream, stream_end);
702}