1// Copyright 2011 Google Inc. All Rights Reserved.
2//
3// Use of this source code is governed by a BSD-style license
4// that can be found in the COPYING file in the root of the source
5// tree. An additional intellectual property rights grant can be found
6// in the file PATENTS. All contributing project authors may
7// be found in the AUTHORS file in the root of the source tree.
8// -----------------------------------------------------------------------------
9//
10// WebPPicture class basis
11//
12// Author: Skal (pascal.massimino@gmail.com)
13
14#include <assert.h>
15#include <stdlib.h>
16
17#include "./vp8i_enc.h"
18#include "../dsp/dsp.h"
19#include "../utils/utils.h"
20
21//------------------------------------------------------------------------------
22// WebPPicture
23//------------------------------------------------------------------------------
24
25static int DummyWriter(const uint8_t* data, size_t data_size,
26 const WebPPicture* const picture) {
27 // The following are to prevent 'unused variable' error message.
28 (void)data;
29 (void)data_size;
30 (void)picture;
31 return 1;
32}
33
34int WebPPictureInitInternal(WebPPicture* picture, int version) {
35 if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_ENCODER_ABI_VERSION)) {
36 return 0; // caller/system version mismatch!
37 }
38 if (picture != NULL) {
39 memset(picture, 0, sizeof(*picture));
40 picture->writer = DummyWriter;
41 WebPEncodingSetError(picture, VP8_ENC_OK);
42 }
43 return 1;
44}
45
46//------------------------------------------------------------------------------
47
48static void WebPPictureResetBufferARGB(WebPPicture* const picture) {
49 picture->memory_argb_ = NULL;
50 picture->argb = NULL;
51 picture->argb_stride = 0;
52}
53
54static void WebPPictureResetBufferYUVA(WebPPicture* const picture) {
55 picture->memory_ = NULL;
56 picture->y = picture->u = picture->v = picture->a = NULL;
57 picture->y_stride = picture->uv_stride = 0;
58 picture->a_stride = 0;
59}
60
61void WebPPictureResetBuffers(WebPPicture* const picture) {
62 WebPPictureResetBufferARGB(picture);
63 WebPPictureResetBufferYUVA(picture);
64}
65
66int WebPPictureAllocARGB(WebPPicture* const picture, int width, int height) {
67 void* memory;
68 const uint64_t argb_size = (uint64_t)width * height;
69
70 assert(picture != NULL);
71
72 WebPSafeFree(picture->memory_argb_);
73 WebPPictureResetBufferARGB(picture);
74
75 if (width <= 0 || height <= 0) {
76 return WebPEncodingSetError(picture, VP8_ENC_ERROR_BAD_DIMENSION);
77 }
78 // allocate a new buffer.
79 memory = WebPSafeMalloc(argb_size, sizeof(*picture->argb));
80 if (memory == NULL) {
81 return WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
82 }
83 // TODO(skal): align plane to cache line?
84 picture->memory_argb_ = memory;
85 picture->argb = (uint32_t*)memory;
86 picture->argb_stride = width;
87 return 1;
88}
89
90int WebPPictureAllocYUVA(WebPPicture* const picture, int width, int height) {
91 const WebPEncCSP uv_csp =
92 (WebPEncCSP)((int)picture->colorspace & WEBP_CSP_UV_MASK);
93 const int has_alpha = (int)picture->colorspace & WEBP_CSP_ALPHA_BIT;
94 const int y_stride = width;
95 const int uv_width = (width + 1) >> 1;
96 const int uv_height = (height + 1) >> 1;
97 const int uv_stride = uv_width;
98 int a_width, a_stride;
99 uint64_t y_size, uv_size, a_size, total_size;
100 uint8_t* mem;
101
102 assert(picture != NULL);
103
104 WebPSafeFree(picture->memory_);
105 WebPPictureResetBufferYUVA(picture);
106
107 if (uv_csp != WEBP_YUV420) {
108 return WebPEncodingSetError(picture, VP8_ENC_ERROR_INVALID_CONFIGURATION);
109 }
110
111 // alpha
112 a_width = has_alpha ? width : 0;
113 a_stride = a_width;
114 y_size = (uint64_t)y_stride * height;
115 uv_size = (uint64_t)uv_stride * uv_height;
116 a_size = (uint64_t)a_stride * height;
117
118 total_size = y_size + a_size + 2 * uv_size;
119
120 // Security and validation checks
121 if (width <= 0 || height <= 0 || // luma/alpha param error
122 uv_width < 0 || uv_height < 0) { // u/v param error
123 return WebPEncodingSetError(picture, VP8_ENC_ERROR_BAD_DIMENSION);
124 }
125 // allocate a new buffer.
126 mem = (uint8_t*)WebPSafeMalloc(total_size, sizeof(*mem));
127 if (mem == NULL) {
128 return WebPEncodingSetError(picture, VP8_ENC_ERROR_OUT_OF_MEMORY);
129 }
130
131 // From now on, we're in the clear, we can no longer fail...
132 picture->memory_ = (void*)mem;
133 picture->y_stride = y_stride;
134 picture->uv_stride = uv_stride;
135 picture->a_stride = a_stride;
136
137 // TODO(skal): we could align the y/u/v planes and adjust stride.
138 picture->y = mem;
139 mem += y_size;
140
141 picture->u = mem;
142 mem += uv_size;
143 picture->v = mem;
144 mem += uv_size;
145
146 if (a_size > 0) {
147 picture->a = mem;
148 mem += a_size;
149 }
150 (void)mem; // makes the static analyzer happy
151 return 1;
152}
153
154int WebPPictureAlloc(WebPPicture* picture) {
155 if (picture != NULL) {
156 const int width = picture->width;
157 const int height = picture->height;
158
159 WebPPictureFree(picture); // erase previous buffer
160
161 if (!picture->use_argb) {
162 return WebPPictureAllocYUVA(picture, width, height);
163 } else {
164 return WebPPictureAllocARGB(picture, width, height);
165 }
166 }
167 return 1;
168}
169
170void WebPPictureFree(WebPPicture* picture) {
171 if (picture != NULL) {
172 WebPSafeFree(picture->memory_);
173 WebPSafeFree(picture->memory_argb_);
174 WebPPictureResetBuffers(picture);
175 }
176}
177
178//------------------------------------------------------------------------------
179// WebPMemoryWriter: Write-to-memory
180
181void WebPMemoryWriterInit(WebPMemoryWriter* writer) {
182 writer->mem = NULL;
183 writer->size = 0;
184 writer->max_size = 0;
185}
186
187int WebPMemoryWrite(const uint8_t* data, size_t data_size,
188 const WebPPicture* picture) {
189 WebPMemoryWriter* const w = (WebPMemoryWriter*)picture->custom_ptr;
190 uint64_t next_size;
191 if (w == NULL) {
192 return 1;
193 }
194 next_size = (uint64_t)w->size + data_size;
195 if (next_size > w->max_size) {
196 uint8_t* new_mem;
197 uint64_t next_max_size = 2ULL * w->max_size;
198 if (next_max_size < next_size) next_max_size = next_size;
199 if (next_max_size < 8192ULL) next_max_size = 8192ULL;
200 new_mem = (uint8_t*)WebPSafeMalloc(next_max_size, 1);
201 if (new_mem == NULL) {
202 return 0;
203 }
204 if (w->size > 0) {
205 memcpy(new_mem, w->mem, w->size);
206 }
207 WebPSafeFree(w->mem);
208 w->mem = new_mem;
209 // down-cast is ok, thanks to WebPSafeMalloc
210 w->max_size = (size_t)next_max_size;
211 }
212 if (data_size > 0) {
213 memcpy(w->mem + w->size, data, data_size);
214 w->size += data_size;
215 }
216 return 1;
217}
218
219void WebPMemoryWriterClear(WebPMemoryWriter* writer) {
220 if (writer != NULL) {
221 WebPSafeFree(writer->mem);
222 writer->mem = NULL;
223 writer->size = 0;
224 writer->max_size = 0;
225 }
226}
227
228//------------------------------------------------------------------------------
229// Simplest high-level calls:
230
231typedef int (*Importer)(WebPPicture* const, const uint8_t* const, int);
232
233static size_t Encode(const uint8_t* rgba, int width, int height, int stride,
234 Importer import, float quality_factor, int lossless,
235 uint8_t** output) {
236 WebPPicture pic;
237 WebPConfig config;
238 WebPMemoryWriter wrt;
239 int ok;
240
241 if (output == NULL) return 0;
242
243 if (!WebPConfigPreset(&config, WEBP_PRESET_DEFAULT, quality_factor) ||
244 !WebPPictureInit(&pic)) {
245 return 0; // shouldn't happen, except if system installation is broken
246 }
247
248 config.lossless = !!lossless;
249 pic.use_argb = !!lossless;
250 pic.width = width;
251 pic.height = height;
252 pic.writer = WebPMemoryWrite;
253 pic.custom_ptr = &wrt;
254 WebPMemoryWriterInit(&wrt);
255
256 ok = import(&pic, rgba, stride) && WebPEncode(&config, &pic);
257 WebPPictureFree(&pic);
258 if (!ok) {
259 WebPMemoryWriterClear(&wrt);
260 *output = NULL;
261 return 0;
262 }
263 *output = wrt.mem;
264 return wrt.size;
265}
266
267#define ENCODE_FUNC(NAME, IMPORTER) \
268size_t NAME(const uint8_t* in, int w, int h, int bps, float q, \
269 uint8_t** out) { \
270 return Encode(in, w, h, bps, IMPORTER, q, 0, out); \
271}
272
273ENCODE_FUNC(WebPEncodeRGB, WebPPictureImportRGB)
274ENCODE_FUNC(WebPEncodeBGR, WebPPictureImportBGR)
275ENCODE_FUNC(WebPEncodeRGBA, WebPPictureImportRGBA)
276ENCODE_FUNC(WebPEncodeBGRA, WebPPictureImportBGRA)
277
278#undef ENCODE_FUNC
279
280#define LOSSLESS_DEFAULT_QUALITY 70.
281#define LOSSLESS_ENCODE_FUNC(NAME, IMPORTER) \
282size_t NAME(const uint8_t* in, int w, int h, int bps, uint8_t** out) { \
283 return Encode(in, w, h, bps, IMPORTER, LOSSLESS_DEFAULT_QUALITY, 1, out); \
284}
285
286LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessRGB, WebPPictureImportRGB)
287LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessBGR, WebPPictureImportBGR)
288LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessRGBA, WebPPictureImportRGBA)
289LOSSLESS_ENCODE_FUNC(WebPEncodeLosslessBGRA, WebPPictureImportBGRA)
290
291#undef LOSSLESS_ENCODE_FUNC
292
293//------------------------------------------------------------------------------
294