The Tor Browser: gfx/gl/GLBlitTextureImageHelper.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* vim: set ts=8 sts=4 et sw=4 tw=80: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "GLBlitTextureImageHelper.h"

     8 #include "GLUploadHelpers.h"

     9 #include "DecomposeIntoNoRepeatTriangles.h"

    10 #include "GLContext.h"

    11 #include "ScopedGLHelpers.h"

    12 #include "nsRect.h"

    13 #include "gfx2DGlue.h"

    14 #include "gfxUtils.h"

    16 namespace mozilla {

    17 namespace gl {

    19 GLBlitTextureImageHelper::GLBlitTextureImageHelper(GLContext* gl)

    20     : mGL(gl)

    21     , mBlitProgram(0)

    22     , mBlitFramebuffer(0)

    24 {

    25 }

    27 GLBlitTextureImageHelper::~GLBlitTextureImageHelper()

    28 {

    29     // Likely used by OGL Layers.

    30     mGL->fDeleteProgram(mBlitProgram);

    31     mGL->fDeleteFramebuffers(1, &mBlitFramebuffer);

    32 }

    34 void

    35 GLBlitTextureImageHelper::BlitTextureImage(TextureImage *aSrc, const nsIntRect& aSrcRect,

    36                                            TextureImage *aDst, const nsIntRect& aDstRect)

    37 {

    38     NS_ASSERTION(!aSrc->InUpdate(), "Source texture is in update!");

    39     NS_ASSERTION(!aDst->InUpdate(), "Destination texture is in update!");

    41     if (aSrcRect.IsEmpty() || aDstRect.IsEmpty())

    42         return;

    44     int savedFb = 0;

    45     mGL->fGetIntegerv(LOCAL_GL_FRAMEBUFFER_BINDING, &savedFb);

    47     ScopedGLState scopedScissorTestState(mGL, LOCAL_GL_SCISSOR_TEST, false);

    48     ScopedGLState scopedBlendState(mGL, LOCAL_GL_BLEND, false);

    50     // 2.0 means scale up by two

    51     float blitScaleX = float(aDstRect.width) / float(aSrcRect.width);

    52     float blitScaleY = float(aDstRect.height) / float(aSrcRect.height);

    54     // We start iterating over all destination tiles

    55     aDst->BeginTileIteration();

    56     do {

    57         // calculate portion of the tile that is going to be painted to

    58         nsIntRect dstSubRect;

    59         nsIntRect dstTextureRect = ThebesIntRect(aDst->GetTileRect());

    60         dstSubRect.IntersectRect(aDstRect, dstTextureRect);

    62         // this tile is not part of the destination rectangle aDstRect

    63         if (dstSubRect.IsEmpty())

    64             continue;

    66         // (*) transform the rect of this tile into the rectangle defined by aSrcRect...

    67         nsIntRect dstInSrcRect(dstSubRect);

    68         dstInSrcRect.MoveBy(-aDstRect.TopLeft());

    69         // ...which might be of different size, hence scale accordingly

    70         dstInSrcRect.ScaleRoundOut(1.0f / blitScaleX, 1.0f / blitScaleY);

    71         dstInSrcRect.MoveBy(aSrcRect.TopLeft());

    73         SetBlitFramebufferForDestTexture(aDst->GetTextureID());

    74         UseBlitProgram();

    76         aSrc->BeginTileIteration();

    77         // now iterate over all tiles in the source Image...

    78         do {

    79             // calculate portion of the source tile that is in the source rect

    80             nsIntRect srcSubRect;

    81             nsIntRect srcTextureRect = ThebesIntRect(aSrc->GetTileRect());

    82             srcSubRect.IntersectRect(aSrcRect, srcTextureRect);

    84             // this tile is not part of the source rect

    85             if (srcSubRect.IsEmpty()) {

    86                 continue;

    87             }

    88             // calculate intersection of source rect with destination rect

    89             srcSubRect.IntersectRect(srcSubRect, dstInSrcRect);

    90             // this tile does not overlap the current destination tile

    91             if (srcSubRect.IsEmpty()) {

    92                 continue;

    93             }

    94             // We now have the intersection of

    95             //     the current source tile

    96             // and the desired source rectangle

    97             // and the destination tile

    98             // and the desired destination rectange

    99             // in destination space.

   100             // We need to transform this back into destination space, inverting the transform from (*)

   101             nsIntRect srcSubInDstRect(srcSubRect);

   102             srcSubInDstRect.MoveBy(-aSrcRect.TopLeft());

   103             srcSubInDstRect.ScaleRoundOut(blitScaleX, blitScaleY);

   104             srcSubInDstRect.MoveBy(aDstRect.TopLeft());

   106             // we transform these rectangles to be relative to the current src and dst tiles, respectively

   107             nsIntSize srcSize = srcTextureRect.Size();

   108             nsIntSize dstSize = dstTextureRect.Size();

   109             srcSubRect.MoveBy(-srcTextureRect.x, -srcTextureRect.y);

   110             srcSubInDstRect.MoveBy(-dstTextureRect.x, -dstTextureRect.y);

   112             float dx0 = 2.0f * float(srcSubInDstRect.x) / float(dstSize.width) - 1.0f;

   113             float dy0 = 2.0f * float(srcSubInDstRect.y) / float(dstSize.height) - 1.0f;

   114             float dx1 = 2.0f * float(srcSubInDstRect.x + srcSubInDstRect.width) / float(dstSize.width) - 1.0f;

   115             float dy1 = 2.0f * float(srcSubInDstRect.y + srcSubInDstRect.height) / float(dstSize.height) - 1.0f;

   116             ScopedViewportRect autoViewportRect(mGL, 0, 0, dstSize.width, dstSize.height);

   118             RectTriangles rects;

   120             nsIntSize realTexSize = srcSize;

   121             if (!CanUploadNonPowerOfTwo(mGL)) {

   122                 realTexSize = nsIntSize(gfx::NextPowerOfTwo(srcSize.width),

   123                                         gfx::NextPowerOfTwo(srcSize.height));

   124             }

   126             if (aSrc->GetWrapMode() == LOCAL_GL_REPEAT) {

   127                 rects.addRect(/* dest rectangle */

   128                         dx0, dy0, dx1, dy1,

   129                         /* tex coords */

   130                         srcSubRect.x / float(realTexSize.width),

   131                         srcSubRect.y / float(realTexSize.height),

   132                         srcSubRect.XMost() / float(realTexSize.width),

   133                         srcSubRect.YMost() / float(realTexSize.height));

   134             } else {

   135                 DecomposeIntoNoRepeatTriangles(srcSubRect, realTexSize, rects);

   137                 // now put the coords into the d[xy]0 .. d[xy]1 coordinate space

   138                 // from the 0..1 that it comes out of decompose

   139                 InfallibleTArray<RectTriangles::coord>& coords = rects.vertCoords();

   141                 for (unsigned int i = 0; i < coords.Length(); ++i) {

   142                     coords[i].x = (coords[i].x * (dx1 - dx0)) + dx0;

   143                     coords[i].y = (coords[i].y * (dy1 - dy0)) + dy0;

   144                 }

   145             }

   147             ScopedBindTextureUnit autoTexUnit(mGL, LOCAL_GL_TEXTURE0);

   148             ScopedBindTexture autoTex(mGL, aSrc->GetTextureID());

   150             mGL->fBindBuffer(LOCAL_GL_ARRAY_BUFFER, 0);

   152             mGL->fVertexAttribPointer(0, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, rects.vertCoords().Elements());

   153             mGL->fVertexAttribPointer(1, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, rects.texCoords().Elements());

   155             mGL->fEnableVertexAttribArray(0);

   156             mGL->fEnableVertexAttribArray(1);

   158             mGL->fDrawArrays(LOCAL_GL_TRIANGLES, 0, rects.elements());

   160             mGL->fDisableVertexAttribArray(0);

   161             mGL->fDisableVertexAttribArray(1);

   163         } while (aSrc->NextTile());

   164     } while (aDst->NextTile());

   166     mGL->fVertexAttribPointer(0, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, nullptr);

   167     mGL->fVertexAttribPointer(1, 2, LOCAL_GL_FLOAT, LOCAL_GL_FALSE, 0, nullptr);

   169     // unbind the previous texture from the framebuffer

   170     SetBlitFramebufferForDestTexture(0);

   172     mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, savedFb);

   173 }

   175 void

   176 GLBlitTextureImageHelper::SetBlitFramebufferForDestTexture(GLuint aTexture)

   177 {

   178     if (!mBlitFramebuffer) {

   179         mGL->fGenFramebuffers(1, &mBlitFramebuffer);

   180     }

   182     mGL->fBindFramebuffer(LOCAL_GL_FRAMEBUFFER, mBlitFramebuffer);

   183     mGL->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER,

   184                                LOCAL_GL_COLOR_ATTACHMENT0,

   185                                LOCAL_GL_TEXTURE_2D,

   186                                aTexture,

   187                                0);

   189     GLenum result = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);

   190     if (aTexture && (result != LOCAL_GL_FRAMEBUFFER_COMPLETE)) {

   191         nsAutoCString msg;

   192         msg.Append("Framebuffer not complete -- error 0x");

   193         msg.AppendInt(result, 16);

   194         // Note: if you are hitting this, it is likely that

   195         // your texture is not texture complete -- that is, you

   196         // allocated a texture name, but didn't actually define its

   197         // size via a call to TexImage2D.

   198         NS_RUNTIMEABORT(msg.get());

   199     }

   200 }

   202 void

   203 GLBlitTextureImageHelper::UseBlitProgram()

   204 {

   205     if (mBlitProgram) {

   206         mGL->fUseProgram(mBlitProgram);

   207         return;

   208     }

   210     mBlitProgram = mGL->fCreateProgram();

   212     GLuint shaders[2];

   213     shaders[0] = mGL->fCreateShader(LOCAL_GL_VERTEX_SHADER);

   214     shaders[1] = mGL->fCreateShader(LOCAL_GL_FRAGMENT_SHADER);

   216     const char *blitVSSrc =

   217         "attribute vec2 aVertex;"

   218         "attribute vec2 aTexCoord;"

   219         "varying vec2 vTexCoord;"

   220         "void main() {"

   221         "  vTexCoord = aTexCoord;"

   222         "  gl_Position = vec4(aVertex, 0.0, 1.0);"

   223         "}";

   224     const char *blitFSSrc = "#ifdef GL_ES\nprecision mediump float;\n#endif\n"

   225         "uniform sampler2D uSrcTexture;"

   226         "varying vec2 vTexCoord;"

   227         "void main() {"

   228         "  gl_FragColor = texture2D(uSrcTexture, vTexCoord);"

   229         "}";

   231     mGL->fShaderSource(shaders[0], 1, (const GLchar**) &blitVSSrc, nullptr);

   232     mGL->fShaderSource(shaders[1], 1, (const GLchar**) &blitFSSrc, nullptr);

   234     for (int i = 0; i < 2; ++i) {

   235         GLint success, len = 0;

   237         mGL->fCompileShader(shaders[i]);

   238         mGL->fGetShaderiv(shaders[i], LOCAL_GL_COMPILE_STATUS, &success);

   239         NS_ASSERTION(success, "Shader compilation failed!");

   241         if (!success) {

   242             nsAutoCString log;

   243             mGL->fGetShaderiv(shaders[i], LOCAL_GL_INFO_LOG_LENGTH, (GLint*) &len);

   244             log.SetCapacity(len);

   245             mGL->fGetShaderInfoLog(shaders[i], len, (GLint*) &len, (char*) log.BeginWriting());

   246             log.SetLength(len);

   248             printf_stderr("Shader %d compilation failed:\n%s\n", i, log.get());

   249             return;

   250         }

   252         mGL->fAttachShader(mBlitProgram, shaders[i]);

   253         mGL->fDeleteShader(shaders[i]);

   254     }

   256     mGL->fBindAttribLocation(mBlitProgram, 0, "aVertex");

   257     mGL->fBindAttribLocation(mBlitProgram, 1, "aTexCoord");

   259     mGL->fLinkProgram(mBlitProgram);

   261     GLint success, len = 0;

   262     mGL->fGetProgramiv(mBlitProgram, LOCAL_GL_LINK_STATUS, &success);

   263     NS_ASSERTION(success, "Shader linking failed!");

   265     if (!success) {

   266         nsAutoCString log;

   267         mGL->fGetProgramiv(mBlitProgram, LOCAL_GL_INFO_LOG_LENGTH, (GLint*) &len);

   268         log.SetCapacity(len);

   269         mGL->fGetProgramInfoLog(mBlitProgram, len, (GLint*) &len, (char*) log.BeginWriting());

   270         log.SetLength(len);

   272         printf_stderr("Program linking failed:\n%s\n", log.get());

   273         return;

   274     }

   276     mGL->fUseProgram(mBlitProgram);

   277     mGL->fUniform1i(mGL->fGetUniformLocation(mBlitProgram, "uSrcTexture"), 0);

   278 }

   280 }

   281 }

The Tor Browser / file revision

gfx/gl/GLBlitTextureImageHelper.cpp@6474c204b198

gfx/gl/GLBlitTextureImageHelper.cpp