reed@google.com | 894aa9a | 2011-09-23 14:49:49 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2011 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 | #ifndef SkImageFilter_DEFINED |
| 9 | #define SkImageFilter_DEFINED |
| 10 | |
| 11 | #include "SkFlattenable.h" |
| 12 | |
reed@google.com | 15356a6 | 2011-11-03 19:29:08 +0000 | [diff] [blame] | 13 | class SkBitmap; |
senorblanco@chromium.org | 8d21f6c | 2012-10-12 19:14:06 +0000 | [diff] [blame] | 14 | class SkColorFilter; |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 15 | class SkDevice; |
reed@google.com | 15356a6 | 2011-11-03 19:29:08 +0000 | [diff] [blame] | 16 | class SkMatrix; |
djsollen@google.com | c73dd5c | 2012-08-07 15:54:32 +0000 | [diff] [blame] | 17 | struct SkIPoint; |
| 18 | struct SkIRect; |
sugoi@google.com | a1c511b | 2013-02-21 15:02:28 +0000 | [diff] [blame] | 19 | class SkShader; |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 20 | class GrEffectRef; |
tomhudson@google.com | d0c1a06 | 2012-07-12 17:23:52 +0000 | [diff] [blame] | 21 | class GrTexture; |
reed@google.com | 15356a6 | 2011-11-03 19:29:08 +0000 | [diff] [blame] | 22 | |
| 23 | /** |
| 24 | * Experimental. |
| 25 | * |
| 26 | * Base class for image filters. If one is installed in the paint, then |
| 27 | * all drawing occurs as usual, but it is as if the drawing happened into an |
| 28 | * offscreen (before the xfermode is applied). This offscreen bitmap will |
| 29 | * then be handed to the imagefilter, who in turn creates a new bitmap which |
| 30 | * is what will finally be drawn to the device (using the original xfermode). |
| 31 | * |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 32 | * THIS SIGNATURE IS TEMPORARY |
| 33 | * |
| 34 | * There are several weaknesses in this function signature: |
| 35 | * 1. Does not expose the destination/target device, so filters that can draw |
| 36 | * directly to it are unable to take advantage of that optimization. |
| 37 | * 2. Does not expose a way to create a "compabitible" image (i.e. gpu -> gpu) |
| 38 | * 3. As with #1, the filter is unable to "read" the dest (which would be slow) |
| 39 | * |
| 40 | * Therefore, we should not create any real dependencies on this API yet -- it |
| 41 | * is being checked in as a check-point so we can explore these and other |
| 42 | * considerations. |
reed@google.com | 15356a6 | 2011-11-03 19:29:08 +0000 | [diff] [blame] | 43 | */ |
senorblanco@chromium.org | 54e01b2 | 2011-11-16 18:20:47 +0000 | [diff] [blame] | 44 | class SK_API SkImageFilter : public SkFlattenable { |
reed@google.com | 894aa9a | 2011-09-23 14:49:49 +0000 | [diff] [blame] | 45 | public: |
robertphillips@google.com | 0456e0b | 2012-06-27 14:03:26 +0000 | [diff] [blame] | 46 | SK_DECLARE_INST_COUNT(SkImageFilter) |
| 47 | |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 48 | class Proxy { |
| 49 | public: |
reed@google.com | 8926b16 | 2012-03-23 15:36:36 +0000 | [diff] [blame] | 50 | virtual ~Proxy() {}; |
| 51 | |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 52 | virtual SkDevice* createDevice(int width, int height) = 0; |
reed@google.com | 8926b16 | 2012-03-23 15:36:36 +0000 | [diff] [blame] | 53 | // returns true if the proxy can handle this filter natively |
| 54 | virtual bool canHandleImageFilter(SkImageFilter*) = 0; |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 55 | // returns true if the proxy handled the filter itself. if this returns |
| 56 | // false then the filter's code will be called. |
| 57 | virtual bool filterImage(SkImageFilter*, const SkBitmap& src, |
| 58 | const SkMatrix& ctm, |
| 59 | SkBitmap* result, SkIPoint* offset) = 0; |
| 60 | }; |
reed@google.com | 894aa9a | 2011-09-23 14:49:49 +0000 | [diff] [blame] | 61 | |
| 62 | /** |
| 63 | * Request a new (result) image to be created from the src image. |
| 64 | * If the src has no pixels (isNull()) then the request just wants to |
| 65 | * receive the config and width/height of the result. |
| 66 | * |
| 67 | * The matrix is the current matrix on the canvas. |
| 68 | * |
| 69 | * Offset is the amount to translate the resulting image relative to the |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 70 | * src when it is drawn. |
reed@google.com | 894aa9a | 2011-09-23 14:49:49 +0000 | [diff] [blame] | 71 | * |
| 72 | * If the result image cannot be created, return false, in which case both |
| 73 | * the result and offset parameters will be ignored by the caller. |
| 74 | */ |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 75 | bool filterImage(Proxy*, const SkBitmap& src, const SkMatrix& ctm, |
reed@google.com | 15356a6 | 2011-11-03 19:29:08 +0000 | [diff] [blame] | 76 | SkBitmap* result, SkIPoint* offset); |
| 77 | |
| 78 | /** |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 79 | * Given the src bounds of an image, this returns the bounds of the result |
| 80 | * image after the filter has been applied. |
| 81 | */ |
| 82 | bool filterBounds(const SkIRect& src, const SkMatrix& ctm, SkIRect* dst); |
| 83 | |
| 84 | /** |
senorblanco@chromium.org | 894790d | 2012-07-11 16:01:22 +0000 | [diff] [blame] | 85 | * Returns true if the filter can be expressed a single-pass |
bsalomon@google.com | a469c28 | 2012-10-24 18:28:34 +0000 | [diff] [blame] | 86 | * GrEffect, used to process this filter on the GPU, or false if |
senorblanco@chromium.org | 894790d | 2012-07-11 16:01:22 +0000 | [diff] [blame] | 87 | * not. |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 88 | * |
bsalomon@google.com | 021fc73 | 2012-10-25 12:47:42 +0000 | [diff] [blame] | 89 | * If effect is non-NULL, a new GrEffect instance is stored |
senorblanco@chromium.org | 894790d | 2012-07-11 16:01:22 +0000 | [diff] [blame] | 90 | * in it. The caller assumes ownership of the stage, and it is up to the |
| 91 | * caller to unref it. |
bsalomon@google.com | 17fc651 | 2012-11-02 21:45:01 +0000 | [diff] [blame] | 92 | * |
| 93 | * The effect can assume its vertexCoords space maps 1-to-1 with texels |
| 94 | * in the texture. |
senorblanco@chromium.org | 894790d | 2012-07-11 16:01:22 +0000 | [diff] [blame] | 95 | */ |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 96 | virtual bool asNewEffect(GrEffectRef** effect, GrTexture*) const; |
senorblanco@chromium.org | 894790d | 2012-07-11 16:01:22 +0000 | [diff] [blame] | 97 | |
| 98 | /** |
senorblanco@chromium.org | 302cffb | 2012-08-01 20:16:34 +0000 | [diff] [blame] | 99 | * Returns true if the filter can be processed on the GPU. This is most |
| 100 | * often used for multi-pass effects, where intermediate results must be |
bsalomon@google.com | 8ea78d8 | 2012-10-24 20:11:30 +0000 | [diff] [blame] | 101 | * rendered to textures. For single-pass effects, use asNewEffect(). |
senorblanco@chromium.org | d043cce | 2013-04-08 19:43:22 +0000 | [diff] [blame] | 102 | * The default implementation returns asNewEffect(NULL, NULL). |
reed@google.com | 15356a6 | 2011-11-03 19:29:08 +0000 | [diff] [blame] | 103 | */ |
senorblanco@chromium.org | 302cffb | 2012-08-01 20:16:34 +0000 | [diff] [blame] | 104 | virtual bool canFilterImageGPU() const; |
reed@google.com | 894aa9a | 2011-09-23 14:49:49 +0000 | [diff] [blame] | 105 | |
senorblanco@chromium.org | 05054f1 | 2012-03-02 21:05:45 +0000 | [diff] [blame] | 106 | /** |
skia.committer@gmail.com | 3284017 | 2013-04-09 07:01:27 +0000 | [diff] [blame] | 107 | * Process this image filter on the GPU. This is most often used for |
senorblanco@chromium.org | d043cce | 2013-04-08 19:43:22 +0000 | [diff] [blame] | 108 | * multi-pass effects, where intermediate results must be rendered to |
| 109 | * textures. For single-pass effects, use asNewEffect(). src is the |
| 110 | * source image for processing, as a texture-backed bitmap. result is |
| 111 | * the destination bitmap, which should contain a texture-backed pixelref |
commit-bot@chromium.org | 7b32070 | 2013-07-10 21:22:18 +0000 | [diff] [blame^] | 112 | * on success. offset is the amount to translate the resulting image |
| 113 | * relative to the src when it is drawn. The default implementation does |
| 114 | * single-pass processing using asNewEffect(). |
senorblanco@chromium.org | 05054f1 | 2012-03-02 21:05:45 +0000 | [diff] [blame] | 115 | */ |
commit-bot@chromium.org | 7b32070 | 2013-07-10 21:22:18 +0000 | [diff] [blame^] | 116 | virtual bool filterImageGPU(Proxy*, const SkBitmap& src, SkBitmap* result, SkIPoint* offset); |
senorblanco@chromium.org | 05054f1 | 2012-03-02 21:05:45 +0000 | [diff] [blame] | 117 | |
senorblanco@chromium.org | 8d21f6c | 2012-10-12 19:14:06 +0000 | [diff] [blame] | 118 | /** |
sugoi@google.com | a1c511b | 2013-02-21 15:02:28 +0000 | [diff] [blame] | 119 | * Returns whether this image filter is a color filter and puts the color filter into the |
sugoi@google.com | 4b6d432 | 2013-02-21 20:26:50 +0000 | [diff] [blame] | 120 | * "filterPtr" parameter if it can. Does nothing otherwise. |
| 121 | * If this returns false, then the filterPtr is unchanged. |
| 122 | * If this returns true, then if filterPtr is not null, it must be set to a ref'd colorfitler |
| 123 | * (i.e. it may not be set to NULL). |
senorblanco@chromium.org | 8d21f6c | 2012-10-12 19:14:06 +0000 | [diff] [blame] | 124 | */ |
sugoi@google.com | 4b6d432 | 2013-02-21 20:26:50 +0000 | [diff] [blame] | 125 | virtual bool asColorFilter(SkColorFilter** filterPtr) const; |
senorblanco@chromium.org | 9f25de7 | 2012-10-10 20:36:13 +0000 | [diff] [blame] | 126 | |
senorblanco@chromium.org | 8d21f6c | 2012-10-12 19:14:06 +0000 | [diff] [blame] | 127 | /** |
| 128 | * Returns the number of inputs this filter will accept (some inputs can |
| 129 | * be NULL). |
| 130 | */ |
| 131 | int countInputs() const { return fInputCount; } |
| 132 | |
| 133 | /** |
| 134 | * Returns the input filter at a given index, or NULL if no input is |
| 135 | * connected. The indices used are filter-specific. |
| 136 | */ |
| 137 | SkImageFilter* getInput(int i) const { |
| 138 | SkASSERT(i < fInputCount); |
| 139 | return fInputs[i]; |
| 140 | } |
| 141 | |
| 142 | protected: |
| 143 | SkImageFilter(int inputCount, SkImageFilter** inputs); |
| 144 | |
senorblanco@chromium.org | c2e8cef | 2012-10-22 15:07:14 +0000 | [diff] [blame] | 145 | // Convenience constructor for 1-input filters. |
| 146 | explicit SkImageFilter(SkImageFilter* input); |
| 147 | |
| 148 | // Convenience constructor for 2-input filters. |
| 149 | SkImageFilter(SkImageFilter* input1, SkImageFilter* input2); |
senorblanco@chromium.org | 9f25de7 | 2012-10-10 20:36:13 +0000 | [diff] [blame] | 150 | |
| 151 | virtual ~SkImageFilter(); |
| 152 | |
| 153 | explicit SkImageFilter(SkFlattenableReadBuffer& rb); |
| 154 | |
| 155 | virtual void flatten(SkFlattenableWriteBuffer& wb) const SK_OVERRIDE; |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 156 | |
| 157 | // Default impl returns false |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 158 | virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&, |
reed@google.com | 15356a6 | 2011-11-03 19:29:08 +0000 | [diff] [blame] | 159 | SkBitmap* result, SkIPoint* offset); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 160 | // Default impl copies src into dst and returns true |
| 161 | virtual bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*); |
reed@google.com | 894aa9a | 2011-09-23 14:49:49 +0000 | [diff] [blame] | 162 | |
| 163 | private: |
senorblanco@chromium.org | 54e01b2 | 2011-11-16 18:20:47 +0000 | [diff] [blame] | 164 | typedef SkFlattenable INHERITED; |
senorblanco@chromium.org | 8d21f6c | 2012-10-12 19:14:06 +0000 | [diff] [blame] | 165 | int fInputCount; |
senorblanco@chromium.org | 9f25de7 | 2012-10-10 20:36:13 +0000 | [diff] [blame] | 166 | SkImageFilter** fInputs; |
reed@google.com | 894aa9a | 2011-09-23 14:49:49 +0000 | [diff] [blame] | 167 | }; |
| 168 | |
| 169 | #endif |