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1 /*
2  * Copyright 2014 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "gm.h"
9 
10 #include "Resources.h"
11 #include "SkCanvas.h"
12 #include "SkData.h"
13 #include "SkImageGenerator.h"
14 #include "SkImageDecoder.h"
15 #include "SkOSFile.h"
16 #include "SkTemplates.h"
17 
18 #ifndef SK_IGNORE_ETC1_SUPPORT
19 
20 #include "etc1.h"
21 
22 /**
23  *  Remove the last row and column of ETC1 blocks, effectively
24  *  making a texture that started as power of two into a texture
25  *  that is no longer power of two...
26  */
slice_etc1_data(void * data,int * width,int * height)27 bool slice_etc1_data(void *data, int* width, int* height) {
28 
29     // First, parse the data and get to it...
30     etc1_byte *origData = reinterpret_cast<etc1_byte *>(data);
31     if (!etc1_pkm_is_valid(origData)) {
32         return false;
33     }
34 
35     int origW = etc1_pkm_get_width(origData);
36     int origH = etc1_pkm_get_height(origData);
37 
38     int blockWidth = (origW + 3) >> 2;
39     int blockHeight = (origH + 3) >> 2;
40 
41     // Make sure that we have blocks to trim off..
42     if (blockWidth < 2 || blockHeight < 2) {
43         return false;
44     }
45 
46     int newWidth = (blockWidth - 1) << 2;
47     int newHeight = (blockHeight - 1) << 2;
48 
49     size_t newDataSz = etc1_get_encoded_data_size(newWidth, newHeight) + ETC_PKM_HEADER_SIZE;
50     SkAutoTMalloc<etc1_byte> am(newDataSz);
51 
52     etc1_byte* newData = am.get();
53 
54     etc1_pkm_format_header(newData, newWidth, newHeight);
55     newData += ETC_PKM_HEADER_SIZE;
56     origData += ETC_PKM_HEADER_SIZE;
57 
58     for (int j = 0; j < blockHeight - 1; ++j) {
59         memcpy(newData, origData, (blockWidth - 1)*ETC1_ENCODED_BLOCK_SIZE);
60         origData += blockWidth*ETC1_ENCODED_BLOCK_SIZE;
61         newData += (blockWidth - 1)*ETC1_ENCODED_BLOCK_SIZE;
62     }
63 
64     // Stick the data back whence it came
65     memcpy(data, am.get(), newDataSz);
66     *width = newWidth;
67     *height = newHeight;
68 
69     return true;
70 }
71 #endif  // SK_IGNORE_ETC1_SUPPORT
72 
73 namespace skiagm {
74 
75 /**
76  *  Test decoding an image from a PKM or KTX file and then
77  *  from compressed ETC1 data.
78  */
79 class ETC1BitmapGM : public GM {
80 public:
ETC1BitmapGM()81     ETC1BitmapGM() { }
~ETC1BitmapGM()82     virtual ~ETC1BitmapGM() { }
83 
84 protected:
onShortName()85     SkString onShortName() override {
86         SkString str = SkString("etc1bitmap_");
87         str.append(this->fileExtension());
88         return str;
89     }
90 
onISize()91     SkISize onISize() override {
92         return SkISize::Make(128, 128);
93     }
94 
95     virtual SkString fileExtension() const = 0;
96 
onDraw(SkCanvas * canvas)97     void onDraw(SkCanvas* canvas) override {
98         SkBitmap bm;
99         SkString filename = GetResourcePath("mandrill_128.");
100         filename.append(this->fileExtension());
101         SkAutoTUnref<SkData> fileData(SkData::NewFromFileName(filename.c_str()));
102         if (nullptr == fileData) {
103             SkDebugf("Could not open the file. Did you forget to set the resourcePath?\n");
104             return;
105         }
106 
107         SkAutoTUnref<SkImage> image(SkImage::NewFromEncoded(fileData));
108         if (nullptr == image) {
109             SkDebugf("Could not decode the ETC file. ETC may not be included in this platform.\n");
110             return;
111         }
112         canvas->drawImage(image, 0, 0);
113     }
114 
115 private:
116     typedef GM INHERITED;
117 };
118 
119 // This class specializes ETC1BitmapGM to load the mandrill_128.pkm file.
120 class ETC1Bitmap_PKM_GM : public ETC1BitmapGM {
121 public:
ETC1Bitmap_PKM_GM()122     ETC1Bitmap_PKM_GM() : ETC1BitmapGM() { }
~ETC1Bitmap_PKM_GM()123     virtual ~ETC1Bitmap_PKM_GM() { }
124 
125 protected:
126 
fileExtension() const127     SkString fileExtension() const override { return SkString("pkm"); }
128 
129 private:
130     typedef ETC1BitmapGM INHERITED;
131 };
132 
133 // This class specializes ETC1BitmapGM to load the mandrill_128.ktx file.
134 class ETC1Bitmap_KTX_GM : public ETC1BitmapGM {
135 public:
ETC1Bitmap_KTX_GM()136     ETC1Bitmap_KTX_GM() : ETC1BitmapGM() { }
~ETC1Bitmap_KTX_GM()137     virtual ~ETC1Bitmap_KTX_GM() { }
138 
139 protected:
140 
fileExtension() const141     SkString fileExtension() const override { return SkString("ktx"); }
142 
143 private:
144     typedef ETC1BitmapGM INHERITED;
145 };
146 
147 // This class specializes ETC1BitmapGM to load the mandrill_128.r11.ktx file.
148 class ETC1Bitmap_R11_KTX_GM : public ETC1BitmapGM {
149 public:
ETC1Bitmap_R11_KTX_GM()150     ETC1Bitmap_R11_KTX_GM() : ETC1BitmapGM() { }
~ETC1Bitmap_R11_KTX_GM()151     virtual ~ETC1Bitmap_R11_KTX_GM() { }
152 
153 protected:
154 
fileExtension() const155     SkString fileExtension() const override { return SkString("r11.ktx"); }
156 
157 private:
158     typedef ETC1BitmapGM INHERITED;
159 };
160 
161 #ifndef SK_IGNORE_ETC1_SUPPORT
162 /**
163  *  Test decoding an image from a PKM file and then
164  *  from non-power-of-two compressed ETC1 data. First slice
165  *  off a row and column of blocks in order to make it non-power
166  *  of two.
167  */
168 class ETC1Bitmap_NPOT_GM : public GM {
169 public:
ETC1Bitmap_NPOT_GM()170     ETC1Bitmap_NPOT_GM() { }
~ETC1Bitmap_NPOT_GM()171     virtual ~ETC1Bitmap_NPOT_GM() { }
172 
173 protected:
onShortName()174     SkString onShortName() override {
175         return SkString("etc1bitmap_npot");
176     }
177 
onISize()178     SkISize onISize() override {
179         return SkISize::Make(124, 124);
180     }
181 
onDraw(SkCanvas * canvas)182     void onDraw(SkCanvas* canvas) override {
183         SkBitmap bm;
184         SkString pkmFilename = GetResourcePath("mandrill_128.pkm");
185         SkAutoDataUnref fileData(SkData::NewFromFileName(pkmFilename.c_str()));
186         if (nullptr == fileData) {
187             SkDebugf("Could not open the file. Did you forget to set the resourcePath?\n");
188             return;
189         }
190 
191         SkAutoMalloc am(fileData->size());
192         memcpy(am.get(), fileData->data(), fileData->size());
193 
194         int width, height;
195         if (!slice_etc1_data(am.get(), &width, &height)) {
196             SkDebugf("ETC1 Data is poorly formatted.\n");
197             return;
198         }
199 
200         SkASSERT(124 == width);
201         SkASSERT(124 == height);
202 
203         size_t dataSz = etc1_get_encoded_data_size(width, height) + ETC_PKM_HEADER_SIZE;
204         SkAutoDataUnref nonPOTData(SkData::NewWithCopy(am.get(), dataSz));
205 
206         SkAutoTUnref<SkImage> image(SkImage::NewFromEncoded(nonPOTData));
207         canvas->drawImage(image, 0, 0);
208     }
209 
210 private:
211     typedef GM INHERITED;
212 };
213 #endif  // SK_IGNORE_ETC1_SUPPORT
214 
215 }  // namespace skiagm
216 
217 //////////////////////////////////////////////////////////////////////////////
218 
219 DEF_GM(return new skiagm::ETC1Bitmap_PKM_GM;)
220 DEF_GM(return new skiagm::ETC1Bitmap_KTX_GM;)
221 DEF_GM(return new skiagm::ETC1Bitmap_R11_KTX_GM;)
222 
223 #ifndef SK_IGNORE_ETC1_SUPPORT
224 DEF_GM(return new skiagm::ETC1Bitmap_NPOT_GM;)
225 #endif  // SK_IGNORE_ETC1_SUPPORT
226